Vaisala DMT340 manual

USER'S GUIDE

Vaisala DRYCAP® Dewpoint and

Temperature Transmitter Series

DMT340

M210704EN-H

PUBLISHED BY

Vaisala Oyj

Street address: Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland

Mailing address: P.O. Box 26, FI-00421 Helsinki, Finland

Phone:

Fax:

+358 9 8949 1

+358 9 8949 2227

Visit our Internet pages at www.vaisala.com

.

© Vaisala 2016

No part of this manual may be reproduced, published or publicly displayed in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be modified, translated, adapted, sold or disclosed to a third party without prior written permission of the copyright holder. Translated manuals and translated portions of multilingual documents are based on the original English versions. In ambiguous cases, the English versions are applicable, not the translations.

The contents of this manual are subject to change without prior notice.

Local rules and regulations may vary and they shall take precedence over the information contained in this manual. Vaisala makes no representations on this manual’s compliance with the local rules and regulations applicable at any given time, and hereby disclaims any and all responsibilities related thereto.

This manual does not create any legally binding obligations for Vaisala towards customers or end users. All legally binding obligations and agreements are included exclusively in the applicable supply contract or the General Conditions of Sale and

General Conditions of Service of Vaisala.

_________________________________________________________________________________

Table of Contents

CHAPTER 1

GENERAL INFORMATION .......................................................................... 11

About This Manual ................................................................. 11

Contents of This Manual ..................................................... 11

Version Information ............................................................. 12

Documentation Conventions ............................................... 12

Safety ....................................................................................... 13

ESD Protection .................................................................... 13

Recycling ................................................................................ 13

Regulatory Compliances ....................................................... 14

EU Declaration of Conformity .............................................. 14

Transmitters with LAN or WLAN Interface .......................... 14

Transmitters with WLAN Interface ...................................... 15

Trademarks ............................................................................. 15

Software License .................................................................... 15

Warranty .................................................................................. 15

CHAPTER 2

PRODUCT OVERVIEW ................................................................................ 17

Introduction to DMT340 ......................................................... 17

Basic Features and Options ................................................ 19

Structure of the Transmitter ................................................ 20

Probe Options ..................................................................... 22

CHAPTER 3

INSTALLATION ............................................................................................ 23

Mounting the Housing ........................................................... 23

Standard Mounting without Mounting Plate ........................ 23

Wall Mounting with Wall Mounting Kit ................................. 24

Mounting with DIN Rail Installation Kit ................................ 26

Pole Installation with Installation Kit for Pole or Pipeline .... 27

Mounting the Rain Shield with Installation Kit ..................... 28

Panel Mounting Frame ........................................................ 28

Wiring ...................................................................................... 30

Cable Bushings ................................................................... 30

Grounding the Cables ......................................................... 31

Transmitter Housing Grounding .......................................... 32

Signal and Power Supply Wiring ......................................... 32

Connections to a 24 VAC Power Supply ............................ 34

Probe Mounting ...................................................................... 35

DMT342 Small-size Flanged Probe for Use with

Sampling Cell ...................................................................... 35

DMT344 For High-pressure Applications ............................ 37

DMT347 Small Pressure-tight Probe .................................. 39

Pressure-Tight Swagelok Installation Kits for DMT347....... 39

DMT348 For Pressurized Pipelines .................................... 41

VAISALA _________________________________________________________________________ 1

User's Guide _______________________________________________________________________

Tightening the Clasp Nut ..................................................... 42

Ball Valve Installation Kit for DMT348 ................................. 44

Leak Screw Installation........................................................ 46

Mounting the Probe Directly to the Process ........................ 47

Sampling Cell for DMT348 .................................................. 49

Optional Modules.................................................................... 51

Power Supply Module.......................................................... 51

Installation ...................................................................... 52

Warnings ........................................................................ 53

Galvanic Isolation of the Power Supply ............................... 56

Third Analog Output ............................................................ 56

Installation and Wiring .................................................... 57

Alarm Relays ....................................................................... 58


Selecting the Activation State of the Relay .................... 58

RS-422/485 Interface .......................................................... 60


LAN Interface ....................................................................... 64

WLAN Interface ................................................................... 65

Attaching the WLAN Antenna......................................... 66

Data Logger Module ............................................................ 66

8-Pin Connector ................................................................... 68

CHAPTER 4

OPERATION ................................................................................................. 69

Getting Started ........................................................................ 69

Display/Keypad ....................................................................... 70

Basic Display ....................................................................... 70

Graphic History .................................................................... 71

Menus and Navigation ......................................................... 73

Changing the Language ................................................. 74

Rounding Setting ............................................................ 74

Display Backlight Setting ................................................ 74

Display Contrast Setting ................................................. 75

Using Display/Keypad ............................................... 75

Using Serial Line ....................................................... 75

Keypad Lock (Keyguard) ................................................ 75

Menu PIN Lock ............................................................... 76

Factory Settings ................................................................... 76

Display Alarms ..................................................................... 77

Configuring a Display Alarm ........................................... 78

Using Serial Line ............................................................ 79

MI70 Link Program for Data Handling .................................. 81

Serial Line Communication ................................................... 82

User Port Connection .......................................................... 83

User Port Operating Modes ............................................ 83

Service Port Connection ...................................................... 84

Connection Cables ......................................................... 84

Installing the Driver for the USB Cable .......................... 84

Using the Service Port .................................................... 85

LAN Communication .............................................................. 85

IP Configuration ................................................................... 86

Using Display/Keypad .................................................... 87


Wireless LAN Configuration ................................................ 89

Using Display/Keypad .................................................... 90

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Communication Protocol ..................................................... 92

Web Configuration for LAN and WLAN ............................... 92

Terminal Program Settings ................................................. 93

Opening a Serial/USB Connection ................................. 94

Opening a Telnet Session (LAN/WLAN) ........................ 95

List of Serial Commands ..................................................... 96

Getting the Measurement Message from Serial Line ......... 99

Starting Continuous Outputting ...................................... 99

Stopping Continuous Outputting .................................... 99

Outputting Reading Once ............................................ 100

Assign an Alias for the SEND Command .................... 100

Outputting Reading Once From All Transmitters ......... 101

Communicating with a Transmitter in POLL Mode ........... 101

OPEN ........................................................................... 101

CLOSE ......................................................................... 101

Formatting Serial Line Message ....................................... 102

FTIME and FDATE....................................................... 102

FST............................................................................... 102

General Settings ................................................................... 103

Changing the Quantities and Units ................................... 103

Using Display/Keypad .................................................. 103

Using Serial Line .......................................................... 104

FORM ........................................................................... 104

UNIT ............................................................................. 105

Pressure Compensation Setting ....................................... 106


Using Buttons on the Motherboard .............................. 107


XPRES and PRES .................................................. 107

Date and Time ................................................................... 108



Data Filtering ..................................................................... 109

FILT .............................................................................. 110

Device Information ............................................................ 111

LIGHT ........................................................................... 112

HELP ............................................................................ 113

ERRS ........................................................................... 113

MODS .......................................................................... 113

VERS ........................................................................... 114

Resetting the Transmitter Using Serial Line ..................... 114

RESET ......................................................................... 114

Locking Menu/Keypad Using Serial Line .......................... 114

LOCK ........................................................................... 114

Serial Output Settings .......................................................... 115

Using Display/Keypad ....................................................... 115

Using Serial Line ............................................................... 116

SERI ............................................................................. 116

SMODE ........................................................................ 117

ADDR ........................................................................... 117

INTV ............................................................................. 118

SDELAY ....................................................................... 118

ECHO ........................................................................... 118

Data Recording ..................................................................... 119

Selecting the Data Recording Quantities .......................... 119

DSEL ............................................................................ 119

VAISALA _________________________________________________________________________ 3

User's Guide _______________________________________________________________________

View Recorded Data .......................................................... 119

DIR ............................................................................... 119

PLAY ............................................................................ 121

Deleting the Recorded Files .............................................. 122

UNDELETE .................................................................. 122

Analog Output Settings ....................................................... 123

Changing the Output Mode and Range............................. 123

Analog Output Quantities .................................................. 124

AMODE/ASEL .............................................................. 125

Analog Output Tests .......................................................... 126

ITEST ........................................................................... 126

Analog Output Fault Indication Setting .............................. 127

AERR ............................................................................ 127

Extend Analog Output Range ............................................ 128

Operation of Relays .............................................................. 128

Quantity for Relay Output .................................................. 128

Measurement-Based Relay Output Modes ....................... 128

Relay Setpoints ............................................................ 128

Hysteresis ..................................................................... 130

Relay Indicating Transmitter Error Status ......................... 130

Enabling/Disabling the Relays ........................................... 132

Operation of the Indication LEDs ...................................... 132

Setting the Relay Outputs ................................................. 133

RSEL ............................................................................ 134

Testing the Operation of Relays ........................................ 135

RTEST .......................................................................... 135

Sensor Functions ................................................................. 136

AutoCal .............................................................................. 136

Automatic AutoCal ........................................................ 136

Manual AutoCal ............................................................ 137

Sensor Purge ..................................................................... 137

Starting and Configuring Sensor Purge............................. 138

Using Display/Keypad (Optional) ................................. 138


PURGE .................................................................... 139

PUR ......................................................................... 139

Sensor Warming ................................................................ 140

CHAPTER 5

MODBUS .................................................................................................... 141

Overview of Modbus Protocol Support .............................. 141

Taking Modbus into Use .................................................... 142

Enabling Serial Modbus ....................................................... 143

Using Display/Keypad (Optional) ...................................... 143


Enabling Ethernet Modbus .................................................. 144

Using Display/Keypad (Optional) ...................................... 144


Diagnostic Modbus Counters .............................................. 147

Viewing Counters Using Display/Keypad .......................... 147

Viewing Counters Using Service Port ............................... 147

Disabling Modbus ................................................................. 148

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CHAPTER 6

MAINTENANCE ......................................................................................... 149

Periodic Maintenance .......................................................... 149

Cleaning ............................................................................ 149

Changing the Probe Filter ................................................. 149

Calibration and Adjustment ............................................... 149

Error States ....................................................................... 150

Technical Support ................................................................ 152

CHAPTER 7

CALIBRATION AND ADJUSTMENT ......................................................... 153

Calibration ............................................................................. 153

User Calibration and Adjustment ...................................... 153

Opening and Closing the Adjustment Mode ..................... 154

Adjustment Information ..................................................... 155

CTEXT and CDATE ..................................................... 155

Adjusting Dewpoint T d/f

....................................................... 156

Two-Point Relative Humidity Adjustment using

Display/Keypad ................................................................. 156

Two-Point Relative Humidity Adjustment using Serial Line

.......................................................................................... 158

One-Point Dewpoint Adjustment using Display/Keypad ... 158

One-Point Dewpoint Adjustment using Serial Line ........... 160

Adjusting Temperature ........................................................ 161

Adjusting Temperature using Display/Keypad .................. 161

Adjusting Temperature using Serial Line .......................... 162

CT................................................................................. 162

Adjusting Analog Outputs ................................................... 163

Adjusting Analog Outputs using Display/Keypad .............. 163

Adjusting Analog Outputs using Serial Line ...................... 164

ACAL ............................................................................ 164

CHAPTER 8

TECHNICAL DATA .................................................................................... 165

Specifications ....................................................................... 165

Performance ...................................................................... 165

Operating Environment ..................................................... 166

Inputs and Outputs ............................................................ 166

Mechanics ......................................................................... 167

Probe Specifications ......................................................... 168

Technical Specifications of Optional Modules .................. 168

Power Supply Module .................................................. 168

Analog Output Module ................................................. 168

Relay Module ............................................................... 169

RS-485 Module ............................................................ 169

LAN Interface Module .................................................. 169

WLAN Interface Module ............................................... 169

Data Logger Module..................................................... 170

Spare Parts and Accessories .............................................. 171

Dimensions (mm/inch) ......................................................... 173

VAISALA _________________________________________________________________________ 5

User's Guide _______________________________________________________________________

APPENDIX A

CALCULATION FORMULAS ..................................................................... 179

APPENDIX B

MODBUS REFERENCE ............................................................................. 183

Function Codes..................................................................... 183

Register Map ......................................................................... 184

Data Encoding ................................................................... 184

32-Bit Floating Point Format ......................................... 184

16-Bit Integer Format ................................................... 185

Measurement Data (Read-Only) ....................................... 186

Status Registers (Read-Only) ........................................... 187

Configuration Registers ..................................................... 187

Exception Status Outputs .................................................... 188

Diagnostic Sub-Functions ................................................... 189

Device Identification Objects .............................................. 190

Exception Responses .......................................................... 190

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List of Figures

Figure 1 Transmitter Body ...................................................................... 20

Figure 2 Inside the Transmitter ............................................................... 21

Figure 3 DMT340 Series Cable Probe Options ...................................... 22

Figure 4 DMT341 with a Fixed Probe ..................................................... 22

Figure 5 Standard Mounting ................................................................... 23

Figure 6 Mounting with Wall Mounting Kit .............................................. 24

Figure 7 Dimensions of the Plastic Mounting Plate (mm/inch) ............... 24

Figure 8 Mounting with Metal Wall Mounting Plate ................................ 25

Figure 9 Dimensions of Metal Mounting Plate (mm/inch) ...................... 25

Figure 10 Mounting with DIN Rail Installation Kit ..................................... 26

Figure 11 Vertical Pole ............................................................................. 27

Figure 12 Horizontal Pole ......................................................................... 27

Figure 13 Mounting the Rain Shield with Installation Kit .......................... 28

Figure 14 Panel Mounting Frame ............................................................. 29

Figure 15 Panel Mounting Dimensions (mm/inch) ................................... 29

Figure 16 Cable Bushings ........................................................................ 30

Figure 17 Grounding the Screen of Electrical Cable ................................ 31

Figure 18 Screw Terminal Block on the Motherboard .............................. 32

Figure 19 Connections to 24 VAC Power Supply ..................................... 34

Figure 20 DMT342 Installation (without the Sampling Cell) ..................... 35

Figure 21 HMP302SC Optional Sampling Cell ......................................... 36

Figure 22 DMT344 Probe ......................................................................... 37

Figure 23 Tightening the Nut .................................................................... 37

Figure 24 Cleaning of the Tightening Cone .............................................. 38

Figure 25 DMT347 Probe with Swagelok Installation Kit ......................... 39

Figure 26 DMT347 Probe Installation to Pipeline with Swagelok

Installation Kit ........................................................................... 39

Figure 27 DMT348 Probe ......................................................................... 41

Figure 28 Leak Screw in the DMT348 Probe ........................................... 41

Figure 29 Sealing of Fitting Body into Process ........................................ 42

Figure 30 Tightening the Clasp Nut .......................................................... 43

Figure 31 Installing the DMT348 Probe Through a Ball Valve Assembly 44

Figure 32 Probe in Leak Screw Installation .............................................. 46

Figure 33 DM240FA with Probe ............................................................... 47

Figure 34 Example of Installing the Probe Directly on the Process Pipe . 48

Figure 35 Sampling Cells DMT242SC2 and DMT242SC......................... 49

Figure 36 Installing the Probe in High Temperatures ............................... 50

Figure 37 Power Supply Module .............................................................. 51

Figure 38 Galvanic Isolation Module ........................................................ 56

Figure 39 Third Analog Output ................................................................. 56

Figure 40 Third Analog Output Selection ................................................. 57

Figure 41 Relay Module ........................................................................... 59

Figure 42 RS-422/485 Module ................................................................. 60

Figure 43 4-Wire RS-485 Bus .................................................................. 62

Figure 44 2-Wire RS-485 Bus .................................................................. 63

Figure 45 LAN Interface Module ............................................................... 64

Figure 46 WLAN Interface Module ........................................................... 65

Figure 47 Data Logger Module ................................................................. 67

Figure 48 Pinout of the Optional 8-Pin Connector .................................... 68

Figure 49 Basic Display ............................................................................ 70

Figure 50 Graphical Display ..................................................................... 71

Figure 51 Graphical Display with Data Logger ......................................... 72

Figure 52 Main Views ............................................................................... 73

Figure 53 Alarm Limits Shown on Graph Screen ..................................... 77

Figure 54 Display Alarm Active ................................................................ 77

VAISALA _________________________________________________________________________ 7

User's Guide _______________________________________________________________________

Figure 55 Display Alarms .......................................................................... 78

Figure 56 Modifying an Alarm Limit .......................................................... 78

Figure 57 Service Port Connector and User Port Terminal on the

Motherboard ............................................................................. 82

Figure 58 Connection Example between PC Serial Port and User Port .. 83

Figure 59 Network Interface Menu ........................................................... 87

Figure 60 IP Configuration Menu .............................................................. 87

Figure 61 Wireless LAN Settings .............................................................. 90

Figure 62 Entering Network SSID ............................................................. 90

Figure 63 Selecting the Wireless Network Type ....................................... 90

Figure 64 Web Configuration Interface for WLAN .................................... 93

Figure 65 Opening a Serial Connection .................................................... 94

Figure 66 Opening a Telnet Connection ................................................... 95

Figure 67 Pressure Set Buttons on the Motherboard ............................. 107

Figure 68 Device Information on Display ............................................... 111

Figure 69 Current/Voltage Switches of Output Modules ........................ 123

Figure 70 Measurement-Based Relay Output Modes ............................ 129

Figure 71 FAULT/ONLINE STATUS Relay Output Modes ..................... 131

Figure 72 Relay Availability..................................................................... 133

Figure 73 Following AutoCal on the Display ........................................... 137

Figure 74 Sensor Purge Settings ............................................................ 138

Figure 75 Performing Sensor Purge ....................................................... 138

Figure 76 Serial Interface Settings ......................................................... 143

Figure 77 IP Configuration ...................................................................... 145

Figure 78 Wireless LAN Settings ............................................................ 145

Figure 79 Communication Protocol ........................................................ 145

Figure 80 Modbus Counters ................................................................... 147

Figure 81 Error Indicator and Error Message ......................................... 150

Figure 82 Starting the Adjustment .......................................................... 156

Figure 83 Performing Purge.................................................................... 156

Figure 84 Following the RH Trend on Graphical Display ....................... 157

Figure 85 Ending Adjustment of Point 1 ................................................. 157

Figure 86 Proceeding to Adjustment of Point 2 ...................................... 157

Figure 87 Completing Adjustment of Point 2 .......................................... 157

Figure 88 Following Stabilization ............................................................ 159

Figure 89 Proceeding with T

Figure 90 Completing T d/f d/f

Adjustment ............................................ 159

Adjustment .................................................... 159

Figure 91 Dewpoint Accuracy vs. Measurement Conditions .................. 165

Figure 92 DMT340 Transmitter Body Dimensions.................................. 173

Figure 93 WLAN Antenna Dimensions ................................................... 174

Figure 94 Sampling Cell Dimensions ...................................................... 174

Figure 95 DMT341 Dimensions .............................................................. 175

Figure 96 DMT342 Probe Dimensions ................................................... 176



Figure 99 DMT348 Standard Probe Dimensions .................................... 177

Figure 100 NPT 1/2" Nut Dimensions ....................................................... 178

Figure 101 DMT348 Optional 400mm Probe Dimensions ........................ 178

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List of Tables

Table 1 Manual Revisions ..................................................................... 12

Table 2 Quantities and Their Abbreviations .......................................... 18

Table 3 Optional Quantities and Their Abbreviations............................ 18

Table 4 DMT348 Probe Dimensions ..................................................... 42

Table 5 Connecting the Twisted PairWires to the Screw Terminals ..... 61

Table 6 4-Wire (Switch 3: On) ............................................................... 62

Table 7 2-Wire (Switch 3: Off) ............................................................... 63

Table 8 Observation Periods and Resolution ........................................ 66

Table 9 Wiring of the Optional 8-Pin Connector .................................... 68

Table 10 Periods for Trend and Max/Min Calculations ........................... 71

Table 11 Graph Information Messages ................................................... 72

Table 12 ALSEL Parameters ................................................................... 80

Table 13 Default Serial Communication Settings for the User Port ........ 83

Table 14 Communication Settings for the Service Port .......................... 85

Table 15 IP Settings for the LAN and WLAN Interfaces ......................... 86

Table 16 Wireless LAN Settings .............................................................. 89

Table 17 Measurement Commands ........................................................ 96

Table 18 Formatting Commands ............................................................. 96

Table 19 Data Recording Commands ..................................................... 97

Table 20 Purge Commands .................................................................... 97

Table 21 Autocalibration Commands ...................................................... 97

Table 22 Calibration and Adjustment Commands ................................... 97

Table 23 Setting and Testing the Analog Outputs .................................. 97

Table 24 Setting and Testing the Relays ................................................ 97

Table 25 Other Commands ..................................................................... 98

Table 26 FORM Command Modifiers.................................................... 104

Table 27 Conversion Factors for Pressure Units .................................. 108

Table 28 Filtering Levels ....................................................................... 109

Table 29 Selection of Output Modes ..................................................... 117

Table 30 Relay State Examples ............................................................ 132

Table 31 Supported Modbus Variants ................................................... 141

Table 32 Error Messages ...................................................................... 151

Table 33 Indicator Led Functions .......................................................... 154

Table 34 Standard Probe Cable Lengths and Approximate

Transmitter Weight (in kg/lb) .................................................. 167

Table 35 Spare Parts and Accessories ................................................. 171

Table 36 Supported Function Codes..................................................... 183

Table 37 DMT340 Modbus Register Blocks .......................................... 184

Table 38 Measurement Data Registers................................................. 186

Table 39 Status Registers ..................................................................... 187

Table 40 Configuration Parameter Registers ........................................ 187

Table 41 Configuration Flag Registers .................................................. 188

Table 42 DMT340 Exception Status Outputs ........................................ 188

Table 43 DMT340 Modbus Diagnostics ................................................ 189

Table 44 DMT340 Modbus Device Identification .................................. 190

Table 45 DMT340 Modbus Exception Responses ................................ 190

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10 ___________________________________________________________________ M210704EN-H

Chapter 1 _________________________________________________________ General Information

CHAPTER 1

GENERAL INFORMATION

About This Manual

This manual provides information for installing, operating, and maintaining Vaisala DRYCAP

Series DMT340.

® Dewpoint and Temperature Transmitter

Contents of This Manual

This manual consists of the following chapters:

- Chapter 1, General Information, provides general notes for the manual

and the product.

- Chapter 2, Product Overview, introduces the features, advantages, and

the product nomenclature of the DMT340.

- Chapter 3, Installation, provides you with information that is intended

to help you install the product.

- Chapter 4, Operation, contains information that is needed to operate

the product.

- Chapter 5, Modbus, contains information that is needed when operating the transmitter using the Modbus protocol.

- Chapter 6, Maintenance, contains information that is needed in basic

maintenance of the product.

- Chapter 7, Calibration and Adjustment, provides information and

instructions concerning the calibration and adjustment of the

DMT340.

- Chapter 8, Technical Data, provides the technical data of the product.

- Appendix A, Calculation Formulas, presents the equations used for

the calculated output quantities.

- Appendix B, Modbus Reference, describes the Modbus functions and data of the transmitter.

VAISALA ________________________________________________________________________ 11

User's Guide _______________________________________________________________________

Version Information

Table 1

Manual Code

M210704EN-H

M210704EN-G

M210704EN-F

Manual Revisions

Description

January 2016. This manual. Updated technical specification. Added DMT341 probe option.

December 2013. Previous version. Added new command descriptions: ALSEL, AOVER, CON,

DSEND, and MODS. Updated FILT command description. Updated technical specification.

Various small corrections.

May 2011. Applicable from transmitter software version 5.10 onward. Added Modbus protocol.

Updated serial line command descriptions.

Updated storage temperature range.

Documentation Conventions

Throughout the manual, important safety considerations are highlighted as follows:

WARNING Warning alerts you to a serious hazard. If you do not read and follow instructions very carefully at this point, there is a risk of injury or even death.

CAUTION Caution warns you of a potential hazard. If you do not read and follow instructions carefully at this point, the product could be damaged or important data could be lost.

NOTE Note highlights important information on using the product.

12 ___________________________________________________________________ M210704EN-H


Safety

The DMT340 Dewpoint and Temperature Transmitter delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions:

WARNING Ground the product, and verify outdoor installation grounding periodically to minimize shock hazard.

CAUTION Do not modify the unit. Improper modification can damage the product, lead to malfunction, or make the product noncompliant with applicable legislation.

ESD Protection

Electrostatic Discharge (ESD) can cause immediate or latent damage to electronic circuits. Vaisala products are adequately protected against

ESD for their intended use. However, it is possible to damage the product by delivering electrostatic discharges when touching, removing, or inserting any objects inside the equipment housing.

To make sure you are not delivering high static voltages yourself:

Recycling

- Handle ESD sensitive components on a properly grounded and protected ESD workbench. When this is not possible, ground yourself to the equipment chassis before touching the boards. Ground yourself with a wrist strap and a resistive connection cord. When neither of the above is possible, touch a conductive part of the equipment chassis with your other hand before touching the boards.

- Always hold the boards by the edges and avoid touching the component contacts.

Recycle all applicable material.

Dispose of the unit according to statutory regulations. Do not dispose of with regular household refuse.

VAISALA ________________________________________________________________________ 13

User's Guide _______________________________________________________________________

Regulatory Compliances

EU Declaration of Conformity

Vaisala DRYCAP® Humidity and Temperature Transmitter Series

DMT340 is in conformity with the provisions of the following EU directives:

- Low Voltage Directive

- EMC-Directive

Conformity is shown by compliance with the following standards:

- EN 60950-1

- EN 61326-1: Electrical equipment for measurement, control, and laboratory use – EMC requirements – for use in industrial locations.

- EN 550022: Information technology equipment – Radio disturbance characteristics – Limits and methods of measurement.

Transmitters with LAN or WLAN Interface

This equipment has been tested and found to comply with the limits for a

Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. Operation is subject to the following two conditions: (1) this device may not cause interference, and

(2) this device must accept any interference, including interference that may cause undesired operation of the device.

This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver.

- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help.

14 ___________________________________________________________________ M210704EN-H


Transmitters with WLAN Interface

This device has been designed to operate with a 2 dBi half-wave antenna.

Antennas with a gain greater than 2 dBi are prohibited for use with this device. The antenna impedance is 50 ohms.

To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (EIRP) is not more than that permitted for successful communication.

This Class [B] digital apparatus complies with Canadian ICES-003.

Cet appareil numérique de la classe [B] est conforme à la norme NMB-

003 du Canada.

Trademarks

DRYCAP® is a registered trademark of Vaisala Oyj.

All other trademarks are the property of their respective owners.

Software License

This product contains software developed by Vaisala. Use of the software is governed by license terms and conditions included in the applicable supply contract or, in the absence of separate license terms and conditions, by the General License Conditions of Vaisala Group.

Warranty

Visit our Internet pages for standard warranty terms and conditions: www.vaisala.com/warranty .

Please observe that any such warranty may not be valid in case of damage due to normal wear and tear, exceptional operating conditions, negligent handling or installation, or unauthorized modifications. Please see the applicable supply contract or Conditions of Sale for details of the warranty for each product.

VAISALA ________________________________________________________________________ 15

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16 ___________________________________________________________________ M210704EN-H

Chapter 2 ___________________________________________________________ Product Overview

CHAPTER 2

PRODUCT OVERVIEW

This chapter introduces the features, advantages, and the product nomenclature of the Vaisala DRYCAP® Dewpoint and Temperature

Transmitter DMT340 Series.

Introduction to DMT340

The DMT340 transmitter measures dewpoint temperature accurately in a measurement range from -70ºC to +80 ºC (-94 ... +176 ºF). The transmitter’s built-in AutoCal feature enables regular automated adjustments,providing excellent long term measurement stability.

DMT340 incorporates the advanced DRYCAP® technology, which enables reliable and high-performance dewpoint measurement.

In addition to the extended dewpoint measurement range, the optional

modules provide for more flexibility. See Table 2 on page 18 for the quantities that DMT340 measures and calculates. See Table 3 on page 18

for the optional quantities measured by DMT340.

VAISALA ________________________________________________________________________ 17

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Table 2

Quantity

Quantities and Their Abbreviations

Dewpoint/frost point temperature (T d/f

)

Mixing ratio (x)

Parts per million

Abbreviation Metric Unit

TDF

X

H2O

ºC g/kg ppm v

/ ppm w

Non-Metric

Unit

ºF gr/lb

ppm v

/ ppm w

Table 3 Optional Quantities and Their Abbreviations

Quantity

Relative humidity RH

Temperature T

Dewpoint/frost point in the atmospheric pressure (T d/f

)

Absolute humidity (a)

Absolute humidity in standard pressure and temperature (NTP)

Wet bulb temperature (T w

)

Water vapor pressure (P w

)

Water vapor saturation pressure

(P ws

)

Enthalpy (h)

Difference of T and T d/f

(∆T)

Dewpoint temperature (T d

)* d

)*

Dewpoint in the atmospheric pressure (T

Abbreviation Metric Unit Non-Metric

Unit

RH

T

TDFA

%RH

ºC

ºC atm

%RH

ºF

ºF atm

A

ANTP

TW

PW

PWS

H

DT

TD

TDA g/m 3 g/m 3

ºC hPa hPa kJ/kg

ºC

ºC

ºC atm gr/ft 3 gr/ft 3

ºF lb/in lb/in

2

2

Btu/lb

ºF

ºF

ºF atm

* Use these parameters only if you need dewpoint over water below 0 ºC/32ºF and not over ice (industry standard)

18 ___________________________________________________________________ M210704EN-H


Basic Features and Options

- Dewpoint measurement with AutoCal and sensor purge features

- Sensor warming in high humidities

- Two analog outputs and a serial interface

- Several probes for different applications

- User-friendly display and keypad interface (optional)

- Calculated output quantities available

- Different probe mounting kits, sensor protection options and probe cable lengths

- Support for Modbus serial communications protocol

- USB connectivity for service connections via the optional

USB-RJ45 cable

- Optional modules:

- Galvanic isolation for outputs

- Power supply module for AC mains power

- RS-422/485-module

- LAN and WLAN interfaces

- Data logger module with real time clock

- Additional analog output module

- Alarm relay module

VAISALA ________________________________________________________________________ 19

User's Guide _______________________________________________________________________

Structure of the Transmitter

1104-001

Figure 1 Transmitter Body

The numbers refer to Figure 1 above:

1 = Signal + powering cable gland

2 = Cable gland for optional module, or WLAN antenna connector

3 = Cable gland for optional module or AC mains cable

4 = Cover screw (4 pcs)

5 = Display with keypad (optional)

6 = Cover LED

20 ___________________________________________________________________ M210704EN-H


0604-006

Figure 2 Inside the Transmitter


1 = Service Port(RS-232)

2 = DIP switches for analog output settings

3 = Power supply and signal wiring screw terminals

4 = Relay, data logger, RS-422/485, LAN, or WLAN module

(optional)

5 = Grounding connector

6 = Power supply module (optional)

7 = Relay, data logger, or analog output module (optional)

8 = Dewpoint probe

9 = Galvanic isolation module (optional)

10 = Adjustment button (Purge button) with indicator LED and pressure set buttons.

VAISALA ________________________________________________________________________ 21

User's Guide _______________________________________________________________________

Probe Options

DMT342 small-size flanged probe for use with sampling cell

Figure 3

DMT344 for high pressure applications

DMT347 probe with

Swagelok connector

DMT348 for pressurized pipelines

0503-019

DMT340 Series Cable Probe Options

For probe cable lengths, see Table 34 on page 167.

Probe in the DMT341 model is fixed to the transmitter and cannot be repositioned. It is intended for installations in dry rooms where the entire dewpoint transmitter needs to be inside the dry space.

Figure 4

1506-094

DMT341 with a Fixed Probe

22 ___________________________________________________________________ M210704EN-H

Chapter 3 ________________________________________________________________ Installation

CHAPTER 3

INSTALLATION

Mounting the Housing

The housing can be mounted either without the mounting plate or with optional mounting plates.

Standard Mounting without Mounting

Plate

Mount the housing without the mounting plate by fastening the transmitter to the wall with 4 screws, for example, M6 (not provided).

Figure 5 Standard Mounting

0804-066

VAISALA ________________________________________________________________________ 23

User's Guide _______________________________________________________________________

Wall Mounting with Wall Mounting Kit

When mounting with wall mounting kit the mounting plate (Vaisala order code 214829) can be installed directly on a wall or a standard wall box (also US junction box). When wiring through back wall, remove the plastic plug from the wiring hole in the transmitter before mounting.

Figure 6

0503-004

Mounting with Wall Mounting Kit


1 = Plastic mounting plate

2 = Mount the plate to wall with 4 screws (M6, not provided)

3 = Arched side up

4 = Fasten DMT340 to the mounting plate with 4 fixing screws

(M3, provided)

5 = Holes for wall/junction box mounting

183 (7.20)

133 (5.24)

Thickness

9.5 (0.37)

59 (2.32)

Figure 7

0804-065

Dimensions of the Plastic Mounting Plate (mm/inch)

Metal mounting plate is included in rain shield with installation kit and installation kit for pole or pipeline.

24 ___________________________________________________________________ M210704EN-H


Figure 8

0503-041

Mounting with Metal Wall Mounting Plate


1 = Mount the plate to wall with 4 screws (M8, not provided)

2 = Fasten DMT340 to the mounting plate with 4 fixing screws

(M6, provided)

3 = Note the position of the arrow when mounting. This side must be up when mounting.

Figure 9

0509-151

Dimensions of Metal Mounting Plate (mm/inch)

VAISALA ________________________________________________________________________ 25

User's Guide _______________________________________________________________________

Mounting with DIN Rail Installation Kit

DIN rail installation kit (Vaisala order code 215094) includes a wall mounting kit, 2 clip-fasteners and 2 screws (M4 x 10 DIN 7985).

1. Attach two spring holders to the plastic mounting plate by using the screws provided in the installation kit.

2. Fasten DMT340 to the plastic mounting plate with 4 screws

(provided).

3. Press the transmitter onto the DIN rail so that the clip-fasteners snap into the rail.

0503-002

Figure 10 Mounting with DIN Rail Installation Kit

26 ___________________________________________________________________ M210704EN-H


Pole Installation with Installation Kit for

Pole or Pipeline

Installation kit for pole or pipeline (Vaisala order code: 215108) includes the metal mounting plate and 4 mounting nuts for pole mounting. When mounting, the arrow in the metal mounting plate must point upward (see

Figure 8 on page 25).

0503-006

Figure 11 Vertical Pole


1 = Fixing brackets (2 pcs) (M8, provided) for 30 ... 102 mm poles.

2 = Mounting nuts (M8, 4 pcs)

Figure 12 Horizontal Pole

0503-007

Number refers to Figure 12 above:

1 = Mounting nuts (M8, 4 pcs)

VAISALA ________________________________________________________________________ 27

User's Guide _______________________________________________________________________

Mounting the Rain Shield with

Installation Kit

The rain shield is highly recommended for outdoor installations, especially for transmitters with the display/keypad option.

0503-008

Figure 13 Mounting the Rain Shield with Installation Kit


1 = Fasten the rain shield with the installation kit (Vaisala order code: 215109) to the metal mounting plate with 2 mounting screws (M6, provided)

2 = Fasten the mounting plate with rain shield with installation kit to the wall or to the pole (see pole installation)

3 = Fasten the DMT340 to the mounting plate with 4 fixing screws

(provided)

Panel Mounting Frame

To enable a neat and dirt free embedded installation of the transmitter, a panel mounting frame is available as an option (Vaisala order code:

216038). The frame is a thin, flexible plastic frame for the transmitter, with adhesive tape on one side.

The frame is used to hide any rough edges of the installation hole, and provide a more finished look. Note that the panel mounting frame is not intended to bear the weight of the transmitter, and does not include any mounting supports.

Use the panel mounting frame as follows:

1. Use the frame as a template to mark the required size for the installation hole in the panel.

2. Cut the hole in the panel.

3. Mount the transmitter through the panel with suitable supports.

28 ___________________________________________________________________ M210704EN-H


4. Remove the paper protecting the adhesive tape on the frame, and

attach the frame around the transmitter. Refer to Figure 14 below.

Figure 14 Panel Mounting Frame


1 = Panel (not included)

2 = Panel mounting frame

0704-002

Figure 15 Panel Mounting Dimensions (mm/inch)

0804-083

VAISALA ________________________________________________________________________ 29

User's Guide _______________________________________________________________________

Wiring

Cable Bushings

A single electrical cable with a screen and three to ten wires is recommended for power and analog/serial connections. The cable diameter should be 8 ... 11 mm. The number of cable bushings depends on the transmitter options. See the following recommendations for the cable bushings:

NOTE

0503-010

Figure 16 Cable Bushings


1 = Cable for signal/powering Ø8 ... 11 mm

2 = Cable for optional module Ø8 ... 11 mm

3 = Cable for optional power module Ø8 ... 11 mm

When there is high electric noise level (for example near powerful electric motor) in the operating environment it is recommended to use shielded cable or take care that the signal cables are separated from other cables.

30 ___________________________________________________________________ M210704EN-H


Grounding the Cables

Ground the screen of the electrical cable properly to achieve the best possible EMC performance.

0605-027

Figure 17 Grounding the Screen of Electrical Cable

Refer to Figure 17 above when performing the procedure below.

1. Cut back outer sheath to desired length.

2. Cut back screen braiding or screen foil to dimension X.

3. Push the domed cap nut (item 1) and the seal insert with contact socket of the gland (item 2+3) onto the cable as shown in the diagram

4. Bend over the screen braiding or screen foil by about 90º

(item 4).

5. Push the seal insert with the contact socket of the gland

(item 2+3) up to the screen braiding or screen foil.

6. Mount the lower part (item 5) on the housing

7. Push the seal with the contact socket of the gland (item 2+3) into the lower part (item 5).

8. Fasten the domed cap nut (item 1) onto the lower part (item 5).

VAISALA ________________________________________________________________________ 31

User's Guide _______________________________________________________________________

Transmitter Housing Grounding

In case you need to ground the transmitter housing, the grounding

connector is found inside the housing; see Figure 1 on page 20. Note

anyhow that the probe is connected to the same potential as the housing.

Make sure that different groundings are made to the same potential.

Otherwise harmful ground currents may be generated.

If it is necessary to have galvanic isolation of the power supply line from the output signals, DMT340 can be ordered with an optional galvanic isolation module.This module prevents harmful grounding loops.

Signal and Power Supply Wiring

When connecting the transmitter with an 8-pin connector, see section 8-

Pin Connector on page 68.

0605-028

Figure 18 Screw Terminal Block on the Motherboard


1 = Power supply terminals 10 ... 35 VDC, 24 VAC

2 = User Port (RS-232 terminals)

3 = Analog signal terminals

WARNING Make sure that you connect only de-energized wires.

32 ___________________________________________________________________ M210704EN-H


1. Open the transmitter cover by taking out the four cover screws.

2. Insert the power supply wires and signal wires through the cable bushing in the bottom of the transmitter; see the grounding instructions in the previous sections.

3. Connect the analog output cables to terminals: Ch1 +, Ch1-, Ch2+,

Ch2-. Connect the RS-232 User Port cables to terminals RxD,

GND and TxD. See section User Port Connection on page 83.

4. When wiring the optional modules, see the corresponding section for instructions:

- RS-422/485 Interface on page 60

- Alarm Relays on page 58

- Third Analog Output on page 56

- LAN Interface on page 64

- WLAN Interface on page 65

5. Connect the power supply wires to the connectors: POWER

10...35V+ 24V∼ (+) and (-) terminals. (If using AC voltage, connect always phase to power supply (+) and 0 to power supply

(-)). When wiring the power supply module, see section Power

Supply Module on page 51.

6. Turn on the power. The indicator LED on the cover is lit continuously during normal operation.

7. Close the cover and replace the cover screws. The transmitter is ready for use.

VAISALA ________________________________________________________________________ 33

User's Guide _______________________________________________________________________

Connections to a 24 VAC Power Supply

Separate floating supply for each transmitter is recommended (see the

upper part of Figure 19 on page 34). If you have to connect several

transmitters or other instruments to one AC supply, the phase (~) must always be connected to the (+) connector of each transmitter (see the

lower part of Figure 19).

CAUTION 24 VAC POWER SUPPLY USE

To prevent fire and/or damage, if either 24 VAC wire is grounded or connected to a "-", "0", or "GND" terminal of any other device, you must connect the same wire on the "-" terminal also on this instrument.

Figure 19 Connections to 24 VAC Power Supply

0703-041

34 ___________________________________________________________________ M210704EN-H


Probe Mounting

NOTE

NOTE

Some probe and filter combinations are equipped with a washer under the filter. When mounting a probe inside a sampling cell, you may have to remove the washer to make the probe fit.

When measuring temperature dependent quantities make sure that the temperature at the measurement point is equal to that of the process, otherwise the moisture reading may be incorrect.

DMT342 Small-size Flanged Probe for

Use with Sampling Cell

The DMT342 probe is a small pressure-tight probe equipped with installation flange. When sampling in pressurized processes, the sampling cell HMP302SC is available as an optional accessory. It may be necessary to use the sampling cell if the process (for example a pipe) is too small for the DMT342 probe. Furthermore, if the process is very hot

(>80 °C) or particularly dirty, the probe is installed in a sampling cell behind a cooling coil and/or filter. In this case, the ambient temperature must be at least 10 °C warmer than the process dewpoint in order to avoid condensation in the sample tubing.

0503-018

Figure 20 DMT342 Installation (without the Sampling Cell)

VAISALA ________________________________________________________________________ 35

User's Guide _______________________________________________________________________

0503-017

Figure 21 HMP302SC Optional Sampling Cell


1 = Gas in

2 = Probe

3 = Gas out

4 = Probe

5 = Sampling cell

6 = Clamp (not needed if sampling cell is supported on the piping)

CAUTION In pressurized processes it is essential to tighten the supporting nuts and screws very carefully to prevent loosening of the probe by the action of pressure.

NOTE When the DMT340 is installed in a process with a pressure differing from the selected operating pressure at the time of ordering, please enter the pressure value of the process into the transmitter memory(see section

Pressure Compensation Setting on page 106). Use the serial line

commands XPRES and PRES or the display/keypad. The pressure set buttons on the motherboard inside the transmitter can also be used to set pressure compensation.

36 ___________________________________________________________________ M210704EN-H


DMT344 For High-pressure Applications

The DMT344 probe is designed for dewpoint measurements in pressurized rooms and industrial processes. The probe is provided with a nut, a fitting screw and a sealing washer. Keep the fitting screw and the nut in place on the body of the probe during handling to prevent damage to the highly polished surface of the probe. Follow the instructions below to achieve a leak-tight assembly:

1. Remove the fitting screw from the nut and the probe.

2. Fasten the fitting screw to the chamber wall with a sealing washer.

Tighten the fitting screw into the threaded sleeve with a torque spanner. The tightening torque is 150 ± 10 Nm (110 ± 7 ft-lbs).

3. Insert the body of the probe into the fitting screw and install the nut manually to the fitting screw so that the connection feels tight.

4. Mark both the fitting screw and the nut hex.

0506-029

Figure 22 DMT344 Probe


1 = Tightening cone

2 = Nut

3 = Fitting screw, M22x1.5 or NPT 1/2"

4 = Sealing washer

5 = Probe; Ø12 mm

5. Tighten the nut a further 30º (1/12) turn or if you have a torque spanner tighten it with a torque of 80 ± 10 Nm (60 ± 7 ft-lbs).

0503-034

Figure 23 Tightening the Nut

VAISALA ________________________________________________________________________ 37

User's Guide _______________________________________________________________________

NOTE When re-tightening the nut after detachment the nut must be tightened without increased effort.

6. Clean and grease the tightening cone of the fitting screw after every tenth detachment. Change the sealing washer every time the fitting screw is detached. Use high-vacuum grease (for example Dow

Corning) or a similar grease.

CAUTION

NOTE

0503-033

Figure 24 Cleaning of the Tightening Cone


1 = Fitting screw

2 = Sealing washer

3 = Tightening cone

4 = Clean cotton stick

In pressurized processes it is essential to tighten the supporting nuts and screws very carefully to prevent loosening of the probe by the action of pressure.

When the DMT340 is installed in a process with a pressure differing from the selected operating pressure at the time of ordering, please enter the pressure value of the process into the transmitter memory. You can enter the value in the following ways:

- using the display/keypad option

- using the buttons on the motherboard

- using the serial line

- using the Modbus protocol

See section Pressure Compensation Setting on page 106. If you are

using Modbus, see section Configuration Registers on page 187.

38 ___________________________________________________________________ M210704EN-H


DMT347 Small Pressure-tight Probe

The DMT347 is ideal for tight spaces with threaded connections. The small probe is installed using the threaded fitting bodies.

Pressure-Tight Swagelok Installation Kits for DMT347

Swagelok installation kit for the dewpoint probe includes Swagelok connector with ISO1/2" thread (Vaisala order code: SWG12ISO12),

ISO3/8" thread (Vaisala order code: SWG12ISO38) or NPT1/2" thread

(Vaisala order code: SWG12NPT12).

0503-042

Figure 25 DMT347 Probe with Swagelok Installation Kit

0503-021

Figure 26 DMT347 Probe Installation to Pipeline with Swagelok

Installation Kit


1 = Probe

2 = Duct connector

3 = ISO1/2", ISO3/8" or NPT1/2" thread

4 = Swagelok connector

5 = Ferrules

VAISALA ________________________________________________________________________ 39

User's Guide _______________________________________________________________________

1. Preparing Installation. The connector options are the following: a. R3/8" ISO (Swagelok code SS-12M0-1-6RTBT) b. 1/2" NPT (Swagelok code SS-12M0-1-8BT) c. 1/2" ISO (Swagelok code SS-12M0-1-8RPBT)

Note that the connector inner diameters extend for Ø12 mm probe.

2. Probe position. Before the final tightening check that the upper edge of the connector nut is in line with the upper edge of the probe. Otherwise the sealing may not be gas tight.

3. Gas tight sealing a. Turn the connector nut finger tight and draw a vertical mark on the nut and the fitting body. b. Be sure that the probe position follows step 2. c. Tighten the connector nut with a wrench 1 and 1/4 turns

(360º +90º) with the help of marks you drew. The connector has now a gas tight connection to the probe. Excess tightening can damage the probe. d. Connector can be disconnected and re-installed. In reinstallation first turn the connector nut finger tight and then with wrench 1/4 turn (90º).

Use teflon tape or thread sealant to seal the connection between the

Swagelok connector and the process (see Figure 29 on page 42).

NOTE If the Swagelok connector is tightened at an incorrect position, it is possible that the probe will not fit the calibration station. Be sure that the probe position follows step 2 above.

40 ___________________________________________________________________ M210704EN-H


DMT348 For Pressurized Pipelines

Due to its sliding fit, the DMT348 is easy to install into and remove from pressurized processes. The probe is especially suitable for measurements

in pipelines (see section Ball Valve Installation Kit for DMT348 on page

44).

0503-020

Figure 27 DMT348 Probe


1 = Clasp nut, 27 mm hex nut

2 = Fitting body, 24 mm hex head

3 = Leak screw

The following three fitting body options are available:

- Fitting Body Set ISO1/2 with leak screw

- Fitting Body ISO1/2 solid structure (without leak screw)

- Fitting Body NPT1/2 solid structure (without leak screw)

1 = Non-leaking screw (A)

(factory setting) or leak screw (B)

(included in the package)

0503-005

Figure 28 Leak Screw in the DMT348 Probe

VAISALA ________________________________________________________________________ 41

User's Guide _______________________________________________________________________

Table 4

Probe type

Standard

Optional

DMT348 Probe Dimensions

Probe Dimension

178 mm

400 mm

Adjustment Range

120 mm

340 mm

0506-031

Figure 29 Sealing of Fitting Body into Process

Tightening the Clasp Nut

1. Adjust the probe to a suitable depth according to the type of installation.

2. Tighten the clasp nut first manually.

3. Mark the fitting screw and the clasp nut.

4. Tighten the nut a further 50 … 60º (ca. 1/6 turn) with a wrench. If you have suitable torque spanner, tighten the nut to max 45 ± 5 Nm

(33 ± 4 ft-lbs).

42 ___________________________________________________________________ M210704EN-H


0505-276

Figure 30 Tightening the Clasp Nut


1 = Probe

2 = Clasp nut

3 = Fitting screw

4 = Pen

CAUTION Take care not to damage the probe body. A damaged body makes the probe less tight and may prevent it from going through the clasp nut.

CAUTION In pressurized processes it is essential to tighten the supporting nuts and screws very carefully to prevent loosening of the probe by the action of pressure.

NOTE

NOTE

Take care not to overtighten the clasp nut to avoid difficulties when opening it.

When the DMT340 is installed in a process with a pressure differing from the selected operating pressure at the time of ordering, please enter the pressure value of the process into the transmitter memory (see

section Pressure Compensation Setting on page 106). Use the serial line

commands XPRES and PRES or the display/keypad. The pressure set buttons on the motherboard inside the transmitter can also be used to set pressure compensation.

VAISALA ________________________________________________________________________ 43

User's Guide _______________________________________________________________________

Ball Valve Installation Kit for DMT348

The ball valve installation kit (Vaisala order code: BALLVALVE-1) is preferred when connecting the probe to a pressurized process or pipeline.

Use the ball valve set or a 1/2" ball valve assembly with a ball hole of

ø14 mm or more. If you install the probe (ø12 mm) in a process pipe, please note that the nominal size of the pipe must be at least 1 inch (2.54 cm). Use the manual press handle to press the probe into the pressurized

(< 10 bar) process or pipeline.

0507-043

Figure 31 Installing the DMT348 Probe Through a Ball Valve

Assembly


1 = Manual press tool

2 = Handle of the ball valve

3 = Probe

4 = Process chamber or pipeline

5 = Groove on the probe indicates the upper adjustment limit

6 = Filter

7 = Ball of the ball valve

8 = Fitting screw

44 ___________________________________________________________________ M210704EN-H


NOTE

NOTE

NOTE

The probe can be installed in the process through the ball valve assembly provided that the process pressure is less than 10 bars. This way, the process does not have to be shut down when installing or removing the probe. However, if the process is shut down before removing the probe, the process pressure can be max. 20 bars.

When measuring temperature dependent quantities make sure that the temperature at the measurement point is equal to that of the process, otherwise the moisture reading may be incorrect.

Follow the steps below to install the DMT348 probe through a ball valve assembly. After the installation, the probe should be sitting in the process

chamber or pipeline as shown in Figure 31 on page 44.

1. Shut down the process if the process pressure is more than 10 bars.

If the pressure is lower there is no need to shut down the process.

2. Close the ball valve.

3.

Seal the threads on the fitting body; see Figure 29 on page 42.

4. Attach the fitting body to the ball valve and tighten it.

5. Slide the clasp nut of the probe toward the filter, as far as it will go.

6. Insert the probe to the fitting body, and manually tighten the clasp nut to the fitting body.

7. Open the ball valve.

8. Push the probe through the ball valve assembly into the process. If the pressure is high, use the pressing handle that is provided with the probe. If you push the probe hard without using the handle, you may damage the cable.

Note that the probe must be pushed so deep that the filter is completely inside the process flow.

9. Mark the fitting screw and the clasp nut.

10. Tighten the clasp nut with a fork spanner a further 50 ... 60º

(ca. 1/6 turn). If you have a suitable torque spanner, tighten the nut

to max 45 ± 5 Nm (33 ± 4 ft-lbs). See Figure 30 on page 43.

Take care not to tighten the clasp nut more than 60° to avoid difficulties when opening it.

If you wish to remove the probe from the process, note that you have to pull the probe out far enough. You cannot close the valve if the groove on the probe body is not visible.

VAISALA ________________________________________________________________________ 45

User's Guide _______________________________________________________________________

Leak Screw Installation

When the probe cannot be installed directly in the pressurized process or process pipe, a leak screw installation can be used.

In this installation method, you must install the DMT348 probe using a

fitting body with leak screw, see Figure 28 on page 41. A small sample

flow from the process goes through the probe and via the leak screw out to atmospheric pressure enabling a fast response time although the probe is not installed in the process.

0503-036

Figure 32 Probe in Leak Screw Installation


1 = Probe

2 = Filter

3 = Ball of the ball valve

4 = Leak screw

46 ___________________________________________________________________ M210704EN-H


Mounting the Probe Directly to the

Process

Select a point that best represents the process. The transmitter can be installed directly on the process wall, especially if the pressure of the process is 1 bar (atmospheric processes).

It may be necessary to use a sampling cell if the process (for example a pipe) is too small for the DMT348 probe. Furthermore, if the process is very hot (>80 °C) or particularly dirty, the probe is installed in a sampling cell behind a cooling coil and/or filter. In this case, the ambient temperature must be at least 10 °C warmer than the process dewpoint in order to avoid condensation in the sample tubing.

0503-016

Figure 33 DM240FA with Probe


1 = Measured gas

2 = Probe

3 = DM240FA flange (thread G1/2" ISO)

4 = Use R1/2" ISO fitting body for DMT348 probe with

DM240FA flange

5 = Recommended additional hole (plugged) for Td field check reference measurement probe (for example, Vaisala DM70)

If the probe is installed in process pipes where the water is likely to collect at the measurement point, take care to install the probe so that it will not be immersed in water.

VAISALA ________________________________________________________________________ 47

User's Guide _______________________________________________________________________

When the probe is installed directly on the process wall or pipe, note that a closing valve may be needed on both sides of the installed probe so that the probe can be removed from the process for calibration or maintenance.

If the probe is installed in a pressurized chamber, always make sure that the pressure of the chamber is equalized with the ambient pressure prior to removing the probe. When the probe is pulled out for maintenance, cap the hole with a capped nut. This way, the process can be running although the probe is not in place. For ISO threaded connections, a plug

(Vaisala order code 218773) is available.

0706-001

Figure 34 Example of Installing the Probe Directly on the Process

Pipe

48 ___________________________________________________________________ M210704EN-H


Sampling Cell for DMT348

It may be necessary to use a sampling cell if the process (for example a pipe) is too small for the DMT348 probe. Furthermore, if the process is very hot (>80 °C) or particularly dirty, the probe is installed in a sampling cell behind a cooling coil and/or filter. In this case, the ambient temperature must be at least 10 °C warmer than the process dewpoint in order to avoid condensation in the sample tubing.

Sampling Cell with Swagelok Connectors (Vaisala order code:

DMT242SC2) and Sampling Cell with Female Connectors (Vaisala order code: DMT242SC) are available as an option.

0506-026

Figure 35 Sampling Cells DMT242SC2 and DMT242SC


1 = Male pipe weld connector Swagelok 1/4"

2 = G1/2"

3 = G1/4"

4 = G3/8"

VAISALA ________________________________________________________________________ 49

User's Guide _______________________________________________________________________

An overpressure in the process is necessary to create a flow through the sampling cell. Note that the pressure of the sampling cell must not differ from that of the process because dewpoint temperature changes with pressure. In dirty processes, it may be necessary to use a filter between the cooling coil and the sampling cell. One more simple way of using the sampling cell with user provided accessories is shown in the figure below. The flow through the sampling cell is controlled with the needle valve and the pressure is kept equal to that of the process.

0503-022

Figure 36 Installing the Probe in High Temperatures

50 ___________________________________________________________________ M210704EN-H


Optional Modules

Power Supply Module

The mains power connection may be connected to the power supply module only by an authorized electrician. A readily accessible disconnect device shall be incorporated in the fixed wiring.

0506-027

Figure 37 Power Supply Module


1 = Connect AC mains voltage wires to these terminals

2 = Grounding terminal

3 = In case the module is not installed in the factory: Connect wires from these terminals to the POWER 10 ... 35V 24V terminals of the motherboard.

4 = +

5 = -

VAISALA ________________________________________________________________________ 51

User's Guide _______________________________________________________________________

Installation

1. Disconnect the power.

2. Remove the protective plug from the cable gland and thread the wires. In case the power supply module is installed in the factory, continue with step 5.

3. To attach the module, open the transmitter cover and fasten the power module to the bottom of the housing with four screws. See

the position in Figure 2 on page 21.

4. Connect the wires from the terminals of the power supply module marked with + and - to the terminals POWER 10 ... 35 V 24V on the motherboard of the transmitter.

5. Connect the AC mains voltage wires to the power supply module terminals marked with N and L.

6. Attach the grounding wire to the grounding terminal on the righthand side of the transmitter.

7. Connect the power. The LED on the cover of the transmitter is lit continuously during normal operation.

WARNING Do not detach the power supply module from the transmitter when the power is on.

WARNING Do not connect the mains power to power supply module when it is not installed in the transmitter.

WARNING Always connect protective ground terminal.

52 ___________________________________________________________________ M210704EN-H


Warnings

Dieses Produkt entspricht der Niederspannungsrichtlinie (2006/95/EWG).

- Das Netzmodul darf nur von einem dazu befugten Elektriker angeschlossen werden.

- Trennen Sie das Netzmodul nicht vom Messwertgeber, wenn der Strom eingeschaltet ist.

- Verbinden Sie das Netzmodul nur mit der Spannungsquelle, wenn es im Messwertgeber

DMT340 montiert ist.

- Das Erdungskabel muss zum Schutz immer angeschlossen sein.

Ce produit est conforme à la Directive relative à la Basse Tension (2006/95/EEC).

- Seul un électricien compétent est habilité à raccorder le module d’alimentation au secteur.

- Ne pas détacher le module d’alimentation du transmetteur lorsqu’il est en service.

- Ne pas raccorder le secteur au module d’alimentation lorsque celui-ci n’est pas installé dans le transmetteur DMT340.

- Toujours raccorder un bornier de protection à la terre.

Tämä tuote on pienjännitedirektiivin (2006/95/EEC) mukainen.

- Vaihtovirtaliitännän saa kytkeä tehonsyöttömoduuliin ainoastaan valtuutettu sähköasentaja

- Älä irrota tehonsyöttömoduulia lähettimestä, kun virta on kytkettynä.

- Älä kytke verkkovirtaa tehonsyöttömoduuliin, jos kyseistä moduulia ei ole asennettu

DMT340-lähettimeen.

- Kytke aina maadoitusliittimet.

Denna produkt uppfyller kraven i direktivet om lågspänning (2006/95/EEC).

- Nätanslutningen (växelströmsanslutningen) får bara anslutas till strömförsörjningsmodulen av en behörig elektriker.

- Ta inte loss strömförsörjningsmodulen från mätaren när strömmen är på.

- Anslut inte strömförsörjningsmodulen till nätet när den inte är installerad i DMT340-mätaren

- Anslut alltid en skyddande jordningsplint.

Questo prodotto è conforme alla Direttiva sul basso voltaggio (2006/95/CEE).

- La conduttura elettrica può essere collegata al modulo di alimentazione elettrica soltanto da un elettricista autorizzato.

- Non staccare l’alimentazione elettrica dal trasmettitore quando è acceso.

- Non collegare la corrente elettrica al modulo di alimentazione elettrica se non è installato nel trasmettitore DMT340.

- Collegare sempre il morsetto protettivo a terra!

VAISALA ________________________________________________________________________ 53

User's Guide _______________________________________________________________________

Dette produkt er i overensstemmelse med direktivet om lavspænding

(2006/95/EØS).

- Netstrømskoblingen til må kun tilsluttes strømforsyningsmodulet af en autoriseret elinstallatør

- Strømforsyningsmodulet må ikke løsgøres fra senderen, mens spændingen er sluttet til.

- Slut ikke netspændingen til strømforsyningsmodulet, når det ikke er installeret i DMT340- senderen

- Forbind altid den beskyttende jordklemme!

Dit product voldoet aan de eisen van de richtlijn 2006/95/EEG

(Laagspanningsrichtlijn).

- De stroom kan aan de stroomtoevoer module aangesloten worden alleen door een bevoegde monteur.

- Het is niet toegestaan de stroomtoevoer module van de transmitter los te koppelen wanneer de stroom aan is.

- Het is niet toegestaan de stroom aan de stroomtoevoer module aan te sluiten als deze niet in een DMT340-transmitter is gemonteerd.

- Altijd beschermend aardcontact aansluiten!

Este producto cumple con la directiva de bajo voltaje (2006/95/EEC).

- La conexión de la alimentación principal al módulo de alimentación sólo puede realizarla un electricista autorizado.

- No desenchufe el módulo de alimentación del transmisor cuando esté encendido.

- No conecte la alimentación principal al módulo de alimentación cuando no esté instalado en el transmisor DMT340.

- Conecte siempre el terminal de protección de conexión a tierra.

See toode vastab madalpinge direktiivile (2006/95/EEC).

- Voolukaabli võib vooluallika mooduli külge ühendada ainult volitatud elektrik.

- Ärge ühendage vooluallika moodulit saatja küljest lahti, kui vool on sisse lülitatud.

- Ärge ühendage voolukaablit vooluallika mooduli külge, kui seda pole DMT340-tüüpi saatjasse paigaldatud.

- Ühendage alati kaitsev maandusklemm!

Ez a termék megfelel a Kisfeszültségű villamos termékek irányelvnek

(2006/95/EGK).

- A hálózati feszültséget csak feljogosított elektrotechnikus csatlakoztathatja a tápegységmodulra.

- A bekapcsolt távadóról ne csatolja le a tápegységmodult.

- Ne csatlakoztassa a hálózati feszültséget a tápegységmodulhoz, ha az nincs beépítve a

DMT340 távadóba.

- Feltétlenül csatlakoztasson földelő védőkapcsot!

54 ___________________________________________________________________ M210704EN-H


Šis produktas atitinka direktyvą dėl žemos įtampos prietaisų (2006/95/EB).

- Elektros tinklą su energijos tiekimo moduliu sujungti gali tik įgaliotas elektrikas.

- Niekada neišimkite energijos tiekimo modulio iš siųstuvo, kai maitinimas yra įjungtas.

- Jei energijos tiekimo modulis nėra įmontuotas DMT340 siųstuve, nejunkite jo į elektros tinklą.

- Visada prijunkite prie apsauginės įžeminimo jungties!

Šis produkts atbilst Zemsprieguma direktīvai (2006/95/EEC).

- Strāvas pieslēgumu var pieslēgt pie barošanas avota moduļa tikai autorizēts elektriķis.

- Neatvienot barošanas avota moduli no raidītāja, kad pieslēgta strāva.

- Nepievienot strāvu barošanas avota modulim, ja tas nav uzstādēts DMT340 raidītājā

- Vienmēr pievienot aizsargājošu iezemētu terminālu !

Ten produkt spełnia wymogi Dyrektywy niskonapięciowej (2006/95/EEC).

- Napięcie zasilające powinno zostać podłączone do modułu zasilacza tylko przez wykwalifikowanego elektryka.

- Nie wolno odłączać modułu zasilacza od nadajnika, kiedy zasilanie jest włączone.

- Nie wolno podłączać napięcia zasilającego do modułu zasilacza, kiedy nie jest on zamontowany w nadajniku DMT340.

- Zawsze należy podłączać zabezpieczający zacisk uziemiający!

Tento výrobek vyhovuje Směrnici pro nízké napětí ( 2006/95/ EEC).

- Připojení síťového napájení k napájecímu modulu smí provádět pouze oprávněný elektrikář.

- Neodpojujte napájecí modul od snímače při zapnutém napájení.

- Nepřipojujte síťové napájení k napájecímu modulu, pokud není instalován ve snímači

DMT340.

- Vždy zapojte ochrannou zemnící svorku!

VAISALA ________________________________________________________________________ 55

User's Guide _______________________________________________________________________

Galvanic Isolation of the Power Supply

If galvanic isolation of the power supply line from the output signals is needed, DMT340 can be ordered with optional galvanic isolation module. This module prevents harmful grounding loops.

NOTE Galvanic isolation module is not needed when using the AC power supply module. Note also that these two modules are physically incompatible to be installed at the same time. If both modules are installed, there is no room to close the transmitter cover completely.

0506-030

Figure 38 Galvanic Isolation Module


1 = Galvanic isolation module

Third Analog Output

0503-030

Figure 39 Third Analog Output


1 = Flat cable pins

2 = Screw terminals for signal line

3 = DIP switches to select the output mode and range

56 ___________________________________________________________________ M210704EN-H


NOTE

Installation and Wiring

1. Disconnect the power. In case the analog output module is installed in the factory, continue with step 4.

2. To attach the module, open the transmitter cover and fasten the analog output module to the position for MODULE 2 with four

screws. See Figure 2 on page 21.

3. Connect the flat cable between the analog output module and the motherboard's connector for MODULE 2.

4. Take out the protective plug from the cable gland and thread the wires.

5. Connect the wires to the screw terminals marked with Ch+ and

Ch- .

6. Select the current/voltage output by setting ON either of the switches 1 or 2.

7. Select the range by setting ON one of the switches 3 ... 7.

Only one of the switches 1 ... 2 can be ON at a time.

Only one of the switches 3 ... 7 can be ON at a time.

0508-029

Figure 40 Third Analog Output Selection

8. Connect the power.

9. Select the quantity and scale the channel via the serial line or

display/keypad (see section Analog Output Quantities on page

124). For testing the analog output, see section Analog Output

Tests on page 126. For fault indication setting, see section Analog

Output Fault Indication Setting on page 127.

VAISALA ________________________________________________________________________ 57

User's Guide _______________________________________________________________________

Alarm Relays

DMT340 can be equipped with one or two configurable relay modules.

Each module contains two configurable relays. See the contact ratings in

section Technical Specifications of Optional Modules on page 168.


1. Disconnect the power. In case the relay module is installed in the factory, continue with the step 5.

2. To attach the module, open the transmitter cover and fasten the relay module to the bottom of the housing with four screws. See the

position in Figure 2 on page 21.

3. When the mains power is in use attach the grounding wire to the grounding terminal.

4. Connect the flat cable between the relay module and the motherboard's pins MODULE 2 or MODULE 1.

5. Take out the protective plug from the cable gland and thread the relay wires.

6. Connect the wires to the screw terminals: NO, C, and NC.

CAUTION For installations in the USA: If your transmitter has both the relay module and a LAN or WLAN module, the maximum voltage you are allowed to connect to the relay module is 50 V.

Selecting the Activation State of the Relay

The middlemost C terminal and either one of the terminals NO/NC shall be connected. The polarity can be freely selected.

NO

C

NC

Normally open

Common relay

Normally closed

Relay NOT activated: C and NC outputs are closed, NO is open

C and NO outputs are closed, NC is open. Relay IS activated:

Connect the power and close the cover. For instructions on how to operate the relay (for example, selecting quantity for the relay output and

setting the relay setpoints), see section Operation of Relays on page 128.

58 ___________________________________________________________________ M210704EN-H


0503-037

Figure 41 Relay Module


1 = Indication LED for relay 1 or 3

2 = Relay test buttons

3 = Flat cable pins

4 = Indication LED for relay 2 or 4

WARNING The relay module may contain dangerous voltages even if the transmitter power has been disconnected. Before working on the relay module you must switch off both the transmitter and the voltage connected to the relay terminals.

WARNING Do not connect the mains power to relay unit without grounding the transmitter.

VAISALA ________________________________________________________________________ 59

User's Guide _______________________________________________________________________

RS-422/485 Interface

The RS-422/485 interface enables communication between an RS-485 network and the DMT340 transmitter. The RS-485 interface is isolated and offers a maximum communications rate of 115 200 bits/s. (For maximum bus length of 1 km, use bit rate 19200 b/s or less.)

When selecting an RS-232 to RS-485 converter for the network, avoid self-powered converters, as they do not necessarily support the needed power consumption.

NOTE The RS-232 User Port on DMT340 main board cannot be used and connected when RS-485 module is connected. The Service Port operates normally.

2

3

NOTE

1

Figure 42 RS-422/485 Module


1 = Flat cable pins

2 = Selection switches

3 = Screw terminals for wiring

1102-023

The data lines on earlier versions of the RS-422/485 module are marked

A and B instead of D1+ and D0-. When the line is idle, D1+ has positive voltage compared to D0-.

When connecting the module, be prepared to swap the D1+ and D0- wires if you have a communication problem.

60 ___________________________________________________________________ M210704EN-H


NOTE


1. Disconnect the power. In case the RS-422/485-module is installed in the factory, continue with step 4.

2. To attach the module, open the transmitter cover and fasten the

RS-422/485 module to the bottom of the housing with four screws.

3. Connect the flat cable between the RS-422/485 module and the motherboard's pins MODULE1 (Communications).

4. Pull the network wirings through the cable gland.

5. Connect the twisted pair wires (1 or 2 pairs) to the screw terminals

as presented in Table 5:

Table 5 Connecting the Twisted PairWires to the Screw

Terminals

Screw Terminal

1

2

3

4

5

Data Line

(2-wire RS-485)

Data Line

(4-wire RS-485/422)

(not connected) Rx D0-

(not connected) Rx D1+

Common

D0-

D1+

Common

Tx D0-

Tx D1+

To avoid problems in the RS-422/485 network, the Common terminal should be wired to the corresponding terminals of the other devices.

6. If you use RS-422 or RS-485 to connect just one DMT340 to a master computer, enable the internal termination of DMT340 by setting switches 1 and 2 to the ON position. Make sure that the master's end of the line is also terminated (by using master's internal termination or with a separate terminator).

If you are connecting many transmitters to the same RS-485 bus, make sure that switches 1 and 2 are OFF and terminate the bus with separate terminators at both ends. This allows removing any transmitter without blocking the bus operation.

If you use the internal termination of the transmitter at the end of the

RS-485 bus (instead of using separate terminators), removing that transmitter will block the bus operation.

7. Use the bus type (4-wire/2-wire) to select the selection switch 3.

In 4-wire mode RS-485 master sends data to the DMT340 through terminals Rx D1+ and Rx D0- and receives data from DMT340 through terminals Tx D1+ and Tx D0-.

VAISALA ________________________________________________________________________ 61

User's Guide _______________________________________________________________________

Rx D0-

Rx D1+

Common

Tx D0-

Tx D1+

RS485 bus master

Stub

Termination

120R

Termination

120R

Common line

Junction box

Address NN

Switch

Term off

Term off

2/4 wire on

RS422 off

Tx D0-

Tx D1+

Common

Rx D0-

Rx D1+

RS485-1

Stub

Common line

Twisted pair

Address MM

Switch

Term off

Term off

2/4 wire on

RS422 off

Tx D0-

Tx D1+

Common

Rx D0-

Rx D1+

RS485-1

Stub 120R

120R

Baud > 19.2K Stub < 10ft, 3m

Baud > 112K Stub < 1ft, 0.3m

Termination

Figure 43 4-Wire RS-485 Bus

Table 6

RS-485 master

Tx D1+

Tx D0-

Rx D1+

Rx D0-

4-Wire (Switch 3: On)

Data

→

→

←

←

DMT340

Rx D1+

Rx D0-

Tx D1+

Tx D0-

Termination

Twisted pair

Junction box

Junction box

1102-028

62 ___________________________________________________________________ M210704EN-H


Termination

120R

D0-

D1+

Common

Junction box

Stub

RS485 bus master

Twisted pair Common line

Address NN

Switch

Term off

Term off

2/4 wire off

RS422 off

Common

D0-

D1+

RS485-1

Stub

Junction box

Twisted pair Common line

Address MM

Switch

Term off

Term off

2/4 wire off

RS422 off

Common

D0-

D1+

RS485-1

Junction box

Stub 120R

Termination

1102-027

Figure 44 2-Wire RS-485 Bus

Table 7 2-Wire (Switch 3: Off)

RS-485 master Data

D1+

D0-

↔

↔

DMT340

D1+

D0-

8. When operating in communication mode RS-422, set both switches

3 and 4 to ON position (4-wire wiring is required for RS-422 mode).

9. Connect the power and close the cover.

VAISALA ________________________________________________________________________ 63

User's Guide _______________________________________________________________________

LAN Interface

The optional LAN interface enables an Ethernet connection to the transmitter. The user can establish a virtual terminal session using a

Telnet client program such as PuTTY or by using Modbus TCP protocol.

When the LAN interface is in use, serial communication using the RS-

232 User Port is disabled.

The LAN interface module must be installed at the factory (when ordering the transmitter), or by a Vaisala Service Center. Once installed, the module is automatically used by the transmitter. The physical connection to the network is made to the RJ45 connector on the LAN interface module, using a standard twisted pair Ethernet cable

(10/100Base-T). Transmitters with the optional LAN interface are delivered pre-installed with a suitable cable and cable gland.

The LAN interface can use both static and dynamic network settings. If the interface is configured to use dynamic settings, the network where the

LAN interface is connected must have a DHCP server that provides the settings.

The network configuration can be done using the optional display and

keypad, or by using the Service Port. For instructions, see section LAN

Communication on page 85. The LAN interface also provides a web

configuration interface, which you can access by entering the IP address of the LAN interface in the address field of a web browser. See section

Web Configuration for LAN and WLAN on page 92.

CAUTION The LAN interface is designed to be used in trusted network environments (trusted corporate LAN or VPN-based connection over internet). Avoid connecting the transmitter directly to a public network because the device can be attacked by a malicious user through the network.

1 = Flat cable connector

2 = RJ45 connector with indicator LEDs for link and activity

Figure 45 LAN Interface Module

0709-003

64 ___________________________________________________________________ M210704EN-H


WLAN Interface

The optional WLAN interface enables a wireless Ethernet connection

(IEEE 802.11b) to the transmitter. The user can establish a virtual terminal session using a Telnet client program such as PuTTY or by using Modbus TCP protocol. When the WLAN interface is in use, serial communication using the RS-232 User Port is disabled.

The interface supports Wired Equivalent Privacy (WEP) and Wi-Fi

Protected Access (WPA, WPA2). For WEP, 64 and 128 bit encryption is supported, with open system or shared key authentication. WPA is used in the Pre-Shared Key (PSK) mode, with either TKIP or CCMP (also known as AES) encryption.

Similarly to the LAN interface, the WLAN interface can use both static and dynamic network settings. If the interface is configured to use dynamic settings, the network where the WLAN interface is connected must have a DHCP server that provides the settings.

The WLAN interface also provides a web configuration interface, which you can access by entering the IP address of the WLAN interface in the

address field of a web browser. See section Web Configuration for LAN and WLAN on page 92.

1 = Flat cable connector

2 = Connector for antenna cable (connected to transmitter cover)

0802-103

Figure 46 WLAN Interface Module

CAUTION The WLAN interface is designed to be used in trusted network environments (trusted corporate LAN or VPN-based connection over internet). Avoid connecting the transmitter directly to a public network because the device can be attacked by a malicious user through the network.

VAISALA ________________________________________________________________________ 65

User's Guide _______________________________________________________________________

NOTE The default country setting for the WLAN interface is United States, which limits the operation to WLAN channels 1 ... 11. To enable additional channels (12 ... 14), you can change the country setting using the web configuration interface.

Attaching the WLAN Antenna

The WLAN interface module must be installed at the factory (when ordering the transmitter), or by a Vaisala Service Center. Before taking the transmitter into use, you must attach the antenna of the WLAN interface into the RP-SMA connector on the transmitter cover. The

location of the antenna is shown in Figure 93 on page 174.

Data Logger Module

The optional data logger module extends the data storage for the measurement data. When the data logger is present, this storage is automatically used by the transmitter. The stored data can be browsed using the optional display module, and accessed through the serial

connections. See sections Graphic History on page 71 and Data

Recording on page 119.

The data logger module contains non-volatile flash memory providing

4 years and 5 months of storage for 4 parameters at a 10-second sampling interval. When the memory is full, the data recording will not stop.

Instead, the oldest data is overwritten. For each parameter and observation period, the module stores the minimum and maximum values during the interval, as well a data trend value that is averaged from

samples taken during the interval (see Table 8 on page 66).

Table 8

3 hours

1 day

10 days

2 months

1 year

4 years

Observation Periods and Resolution

Observation Period Period for Trend/Max/Min

Calculations (Resolution)

90 seconds

12 minutes

2 hours

12 hours

3 days

12 days

The quantities that are logged are the same that have been selected for measurement using the display/keypad or the serial line. When taking the transmitter into use, verify that the desired quantities are selected. If you change the quantities later, the transmitter will start logging the new quantities, and stop logging the quantities that are no longer selected.

Changing the quantities does not delete any measurement data that is already in memory. However, the data of any removed quantity cannot be accessed unless the quantity is re-activated first.

66 ___________________________________________________________________ M210704EN-H


The data logger module has a real time clock with a battery back-up. The clock has been set to the Coordinated Universal Time (UTC) at the factory, and its time cannot be set by the user. The data that is stored in the logger's memory is timestamped using the logger's clock.

When date and time are set on the transmitter, they are stored to the transmitter's memory as an offset from the time on the logger's clock.

When browsing the stored data, the time offset is applied to the timestamps shown in the graphical history, and data outputted from the serial port. The timestamps in the data logger's memory remain as they were originally stored.

You can compensate for the clock drift (less than ±2 min/year) by setting the time on the transmitter. This updates the time offset used on the display and the serial port. You can set the time by using the keypad/display or the serial commands.

1 = Flat cable pins

2 = Battery

Figure 47 Data Logger Module

0706-068

After a reset or a power up, it will usually take at least 10 seconds before the data logger module is initialized. The instrument will not start up before the data logger module is ready.

The indicator LED on the module will blink green during normal operation. If the LED is lit in red color, there is a problem with the module. The transmitter will also indicate the problem by activating the

"Internal error on add-on module" error. If the module is not operating correctly, the transmitter must be sent to Vaisala for maintenance.

The data logger module must be installed at the factory (when ordering the transmitter), or by a Vaisala Service Center. Once installed, the module is automatically used by the transmitter. When the module requires a new battery, the transmitter must be sent to Vaisala for maintenance.

VAISALA ________________________________________________________________________ 67

User's Guide _______________________________________________________________________

8-Pin Connector

1104-126

Figure 48 Pinout of the Optional 8-Pin Connector

3

4

5

6

7

8

Table 9

Pin Wire

1

2

White

Brown

Wiring of the Optional 8-Pin Connector

Serial Signal

RS-232 (EIA-232) RS-485 (EIA-485)

Data out TX

(Serial GND)

D1+

(Serial GND)

Green

Yellow

Grey

Pink

-

-

Supply -

Supply +

Blue Data in RX

Shield/Red Cable shield

-

-

Supply -

Supply +

D0-

Cable shield

Analog Signal

-

Signal GND (for both channels)

Ch 2+

Ch 1 +

Supply -

Supply +

-

Cable shield

68 ___________________________________________________________________ M210704EN-H

Chapter 4 _________________________________________________________________ Operation

CHAPTER 4

OPERATION

This chapter contains information that is needed to operate this product.

Getting Started

Within a few seconds after power-up the LED on the cover of the transmitter is lit continuously indicating normal operation. When the transmitter is turned on the first time, the language selection window opens. Select the language with ▼▲ arrow buttons and press the

SELECT button (the left-hand button).

Pressure has an effect on humidity calculations and accuracy. Therefore, accurate calculations can be achieved only when the ambient pressure is

taken into consideration. See Pressure Compensation Setting on page 106

for instructions on how to set the pressure.

Start-up time for the DMT340 transmitter is in total about 6 minutes. The ouputs (serial and analog) are activated 3 seconds after powering up the

DMT340. If the data logger module is installed, then it may take up to 18 seconds for the outputs to be activated.

In addition, 10 seconds after the measurement the outputs will freeze for about 6 minutes due to the sensor self-diagnostics procedure (Sensor

Purge and Autocal). The frozen output value will be the value the

DMT340 transmitter reached during the 10 seconds of measurement.

After the self-diagnostics procedure, the outputs are operational again.

VAISALA ________________________________________________________________________ 69

User's Guide _______________________________________________________________________

Display/Keypad

Basic Display

Display shows you the measurement values of the selected quantities in the selected units. You can select 1 ... 4 quantities for the numerical basic

display (see section Changing the Quantities and Units on page 103).

NOTE

Figure 49 Basic Display

0706-009


1 = INFO shortcut button

2 = GRAPH shortcut button opens a curve graph view

3 = Selected quantities

Press the INFO button (in the basic display) to view the device

information views (see section Device Information on page 111).

From any view, even in the absence of an EXIT button, a four-second press on the right-hand function button takes you directly to the basic display.

70 ___________________________________________________________________ M210704EN-H


Graphic History

The graphical display shows the data trend or min/max graph of the selected quantities, one at a time. The graph is updated automatically while measuring.

Figure 50 Graphical Display

0706-01

Trend graph: Shows you a curve of average values. Each value is a

calculated average over a period (see Table 10 below).

Max/min graph: Shows you the minimum and maximum values in curve form. Each point shows the absolute minimum and maximum

observed during the time period represented by the data point. See Table

10 below.

Table 10 Periods for Trend and Max/Min Calculations

Observation Period

3 hours

1 day

10 days

2 months

1 year

4 year*

Period for Trend/Max/Min

Calculations (Resolution)

1,5 minutes

12 minutes

2 hours

12 hours

3 days

12 days

* Shows the maximum logging period of the data logger module (available when data logger module is installed)

Use the following functions in the graphical display:

- Press the NEXT button to change between the trend graph and max/min graph for the quantities selected for display.

- Press the EXIT button to return to the basic display.

- Press the ▼▲ arrow buttons to zoom in and out in the graph window.

- Press the ◄► arrow buttons move the cursor (vertical bar) along the time axis. The cursor mode allows you to observe individual measuring points. The numerical value at the cursor position is shown at the left upper corner. The right upper corner shows the time from the present to the chosen moment (without the logger module), or the date and time at the cursor position (when the logger module is installed).

VAISALA ________________________________________________________________________ 71

User's Guide _______________________________________________________________________

- If the optional data logger module is installed, you can scroll the cursor off the screen to move to a new point on the time axis. The new date will be displayed, and the cursor will be centered at the date where the cursor scrolled off the screen.

0706-030

Figure 51 Graphical Display with Data Logger

If the data logger module is installed, you can move quickly on the time axis: zoom out, move the cursor, and zoom back in.

The time that is shown below the graph is adjusted with the current time offset of the transmitter. If you change the transmitter's date and time setting, the displayed timestamps in the history graph change accordingly. For an explanation of the effect of changing the date and

time manually, see section Data Logger Module on page 66.

Table 11 Graph Information Messages

Failure Message

Power outage

No data

System error

T meas. error

RH meas. error

Adj. mode active

Autocal

Interpretation

Power failure (marked also with dashed vertical line)

Quantity has not been selected for the display

General device or power supply problem

Temperature measurement/sensor failure

Humidity measurement/sensor failure

Adjustment mode active (data recorded in the adjustment mode is not displayed)

AutoCal performed (only shown in 3 h graphs)

A question mark after time tells you that at least one power failure

(dashed vertical line) has occurred after the chosen moment. In this case, the actual time difference between the present and the cursor position is not accurately known. If the data logger module is installed, the time is known and the question marks are not present.

72 ___________________________________________________________________ M210704EN-H


Menus and Navigation

You can change settings and select functions in the menus.

1. Open the Main Menu by pressing any of the ▲▼◄► arrow buttons in the basic (numeric) display mode.

2. Move in the menus by using the ▲▼ arrow buttons.

3. Open a submenu with ► button.

4. Press ◄ to return to the previous level.

5. Function button EXIT returns you back to the basic display.

The adjustment menu is displayed only when the ADJ button (on the motherboard inside the transmitter) is pressed.

Figure 52 Main Views

0706-011

Some menu items, such as Relay outputs in the Interfaces menu, are only shown if supported by the transmitter and the installed options.

VAISALA ________________________________________________________________________ 73

User's Guide _______________________________________________________________________

Changing the Language

1. Go back to the basic display by keeping the right-hand button pressed for four seconds.

2. Open the Main menu by pressing any of the ▼▲◄► buttons.

3. Scroll to the System menu option, and press the ► button. The menu option is indicated with the wrench symbol.

4. Scroll to the Language menu option, and press the left-hand button. The menu option is indicated with the flag symbol.

5. Select the language with the ▼▲ buttons, and confirm the selection by pressing the left-hand button.

6. Press the right-hand button to exit to the basic display.

Rounding Setting

Round off one decimal by using the Rounding function. The default settings have rounding in use. .Rounding has no effect on quantities without decimals.

1. Open the Main Menu by pressing any of the ▲▼◄► arrow buttons.

2. Select ►Display and confirm by pressing the ► arrow button.

3. Select Rounding and press ON/OFF button.

4. Press EXIT to return to the basic display.

Display Backlight Setting

As a default the display backlight is always on. In the automatic mode the backlight stays on for 30 seconds from the last press of a button. The light turns on again when any button is pressed.

1. Open the Main Menu by pressing any of the ▲▼◄► arrow buttons

2. Select ►Display, press the ►arrow button.

3. Select Backlight, press the CHANGE button.

4. Select On/Off/Automatic, press the SELECT button.


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Display Contrast Setting

Display contrast is automatically adjusted based on the ambient temperature. However, depending on the installation location and viewing direction, it may be necessary to fine-tune the contrast manually.

Using Display/Keypad


2. Select ►Display, press the ►arrow button.

3. Select Contrast, press the ADJUST button.

4. Adjust the contrast by pressing the ◄► arrow buttons.

5. Press OK and EXIT to return to the basic display.

Using Serial Line

Use the serial line command CON to view or set the display contrast.

CON [xxx]<cr> where xxx = Contrast value for display. Recommended range -9 ... 9, default 0. Negative values make screen lighter, positive values make it darker.

Example (view current contrast setting):

>con

Contrast : 0

>

Example (set contrast to 5):

>con 5

Contrast : 5

>

Keypad Lock (Keyguard)

This function locks the keypad and prevents unintentional key presses.

1. Keep pressing the left-hand function button for 4 seconds to lock the keypad (at any display).

2. To unlock the keypad, press the OPEN button for 4 seconds.

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Menu PIN Lock

You can prevent unauthorized changes of the device settings by activating the menu PIN lock. When this function is activated, the basic display, graphical view, and device information displays are available but access to the menus is locked. The key symbol indicates the activation of this feature.


2. Select System, press the ► arrow button.

3. Select Menu PIN, press the ON button.

4. Enter a PIN code by using the ▲▼ arrow buttons. Press OK to confirm the setting. Now the PIN lock is on and a key symbol is shown in a display.

5. Press EXIT to return to the basic display. Returning to the menu is possible only by entering the correct PIN code.

When you want to turn off the PIN lock, go to the menu by giving the

PIN code and select System, Menu PIN, and press OFF button.

In case you have forgotten the PIN code, open the transmitter cover and press the ADJ button once. Wait for a few seconds and the adjustment menu opens. Select Clearmenu PIN, press CLEAR.

NOTE You can also disable the keypad completely with the serial command

LOCK. See section Locking Menu/Keypad Using Serial Line on page

114.

Factory Settings

Use the display/keypad to restore the factory settings. This operation does not affect the adjustments. Only settings available in the menus are restored.

1. Press any of the arrow buttons to open the Main Menu.

2. Select System by pressing the ► arrow button.

3. Select Factory settings and press the REVERT button to confirm your selection. Press the YES button to reset all settings to the factory defaults.

See section General Settings on page 103 for a description of the other

menu options.

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Display Alarms

The Display Alarm feature provides two independently configurable alarms for transmitters with the display/keypad option. Each alarm tracks a selected quantity, with freely configurable limit values. Each alarm also has a configurable hysteresis value to prevent unnecessary triggering when the measurement fluctuates around an alarm limit. The alarms can be configured for any quantity supported by the transmitter. The configuration of the Display Alarms can only be done using the display/keypad option.

You can have the alarm activate inside or outside the specified range by setting the limits correctly:

- To have the alarm activate when the measured quantity is outside the specified range, set the Act. above limit higher than the Act. below limit.

- To have the alarm activate when the measured quantity is inside the range, set the Act. above limit lower than the Act. below limit.

The alarm limits are shown on the graph display as thicker dotted lines.

When a display alarm is activated, the automatic scaling of the graph display always keeps the limits in view.

1103-062

Figure 53 Alarm Limits Shown on Graph Screen

When an alarm is activated, an alarm note is displayed on the display, and the lights of the display will blink. If the data logger module is installed, the alarm note includes the time and date of the alarm.

1103-063

Figure 54 Display Alarm Active

Multiple alarms can be active at the same time; the alarm that was triggered first will be shown on the display. The next active alarm is

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Activated alarms are only shown on the screen; there are no alarm messages output to the serial line. After an alarm has been acknowledged, you must refer to the data graphs to see when the measured quantities have exceeded the limits. You may use the optional relay outputs as alarm outputs by configuring them separately; see

section Setting the Relay Outputs on page 133.

Configuring a Display Alarm

1. Enter the Main Menu by pressing an arrow key on the keypad.

2. Use the arrow keys to select Display, followed by Alarms, to open the Display Alarms menu. The Display Alarms menu shows the currently enabled and disabled alarms.

NOTE

0802-069

Figure 55 Display Alarms

3. Use the arrow keys to select an alarm to configure. The alarm editing page opens.

The changes you make on the alarm editing page will take effect immediately, and may cause an alarm to appear on the screen.

4. To select a quantity for the alarm, press the Change button and select the quantity from the list.

5. To modify or remove the alarm limit values, move the selection over the Act. above or Act. below field and press the Set button.

You will be prompted to Modify or Remove the value.

0802-070

Figure 56 Modifying an Alarm Limit

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When modifying the value, use the arrow up and down buttons to change the value under the cursor. Left and right arrow buttons move the cursor. Select the OK button to accept the modified value, or Cancel to undo the modification.

6. Set a suitable Hysteresis value to prevent the alarm from being triggered unnecessarily by small measurement changes that pass the alarm limit repeatedly.

7. Set or clear the Alarm enable checkbox to enable or disable the alarm.

8. Press the Exit button to leave the alarm configuration screen and return to the basic view.

Using Serial Line

Use the serial line command ALSEL to view or set the display alarms.

ALSEL [quantity1 quantity2]<cr> where quantity1 = Quantity for display alarm 1. You can set any quantity

available on your transmitter; see Table 2 on page 18 and

Table 3 on page 18. In addition to quantities, you can also

select the following:

FAULT – Alarm for device errors

ONLINE – Alarm for sensor operations that freeze the measurement output (for example, sensor purge). quantity2 = Quantity for display alarm 2. Options are the same as for quantity1.

Example (view current display alarm settings):

>alsel ?

Al1 Tdf above: 0.00 'C

Al1 Tdf below: -

Al1 Tdf hyst : 1.00 'C

Al1 Tdf enabl: ON

Al2 T above: 40.00 'C

Al2 T below: -

Al2 T hyst : 1.00 'C

Al2 T enabl: ON

>

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Table 12 ALSEL Parameters

Name Description above If specified, the alarm goes off when the quantity value rises above the exact value of this setpoint. However, if above < below, the alarm goes off at (above + hyst) and (below – hyst) instead. below

Cannot be set for fault and online alarms.

If specified, the alarm goes off when the quantity value decreases below the exact value of this setpoint. However, if above < below, the alarm goes off at (above + hyst) and (below – hyst) instead. hyst enabl


Distance from setpoint amount of extra retractment needed in order to regenerate alarm on the next crossing of the setpoint.


Enable (ON) or disable (OFF) the display alarm.

Example (set H2O and T as display alarm quantities and configure the alarms as prompted):

>alsel h2o t

Al1 H2O above: 0.00 ppmV ? 6000

Al1 H2O below: - ?

Al1 H2O hyst : 1.00 ppmV ? 500

Al1 H2O enabl: ON ?

Al2 T above: 40.00 'C ? 30

Al2 T below: - ?

Al2 T hyst : 1.00 'C ?

Al2 T enabl: ON ?

>

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MI70 Link Program for Data Handling

MI70 Link is a support program that enables you to handle the measurement data of your Vaisala transmitter using a Windows PC.

Using the MI70 Link you can, for example:

- Monitor the transmitter’s measurement readings directly using the real-time window function.

- Transfer recorded data from the main transmitter memory in numeric or graphical format, for further use in a spreadsheet program (such as

Microsoft Excel) or virtually any other application. Note that the maximum amount of data points that can be downloaded in one transfer is 65000.

To use the MI70 Link program, you must connect your Windows PC to the Service Port of the transmitter with a serial or USB cable. The MI70

Link program, and the optional connection cables, are available from

Vaisala. See section Spare Parts and Accessories on page 171.

Follow the steps below to connect your transmitter and start using the

MI70 Link:

1. Connect your PC to the Service Port of the transmitter. Refer to

section Service Port Connection on page 84.

2. Check that the DMT340 is powered.

3. Start the MI70 Link program.

4. Start using the program. There is usually no need to select a COM port manually, the MI70 Link software can detect it automatically.

NOTE For instructions on using MI70 Link, see the program’s online help.

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Serial Line Communication

Connect the serial interface by using either the User Port or the Service

Port.

For permanent interfacing to host system, use the User Port. You can change the serial settings and operate in RUN, STOP, POLL and Modbus modes.

For temporary connections, use the Service Port. The Service Port is always available with fixed serial settings.

0605-039

Figure 57 Service Port Connector and User Port Terminal on the

Motherboard


1 = Service Port connector

2 = User Port Terminals

82 ___________________________________________________________________ M210704EN-H


User Port Connection

Use a suitable serial cable between the User Port RxD, GND and TxD screw terminals and the PC serial port.

Table 13

Parameter

Bauds

Parity

Data bits

Stop bits

Flow control

Default Serial Communication Settings for the User

Port

Value

4800

Even

7

1

None

NOTE

RxD

GND

TxD

+

–

Ch1+

Ch1–

Ch2+

1 2 3 4 5

6 7 8 9

Ch2–

IOIOI

0506-033

Figure 58 Connection Example between PC Serial Port and User

Port

Connections to pins 4,6,7 and 8 are required only if your software requires hardware handshaking.

User Port Operating Modes

When the transmitter is powered up, it will behave according to its configured operating mode:

- In STOP mode, the transmitter outputs the software version and the command prompt (if echo is on).

- In RUN mode a measurement output starts immediately.

- In POLL or MODBUS mode, the transmitter does not output anything after power-up.

For a description of the modes, see section SMODE on page 117.

RS-232 User Port cannot be used when a communication module

(LAN, WLAN, or RS-422/485 interface) has been installed.

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Service Port Connection

Connection Cables

To connect to the Service Port, you need a suitable cable with an RJ45 connector. Depending on the connections of your PC, you can either use the Serial Connection Cable (optional accessory 19446ZZ) or the

USB-RJ45 Serial Connection Cable (optional accessory 219685). The

USB cable enables you to connect the transmitter to a PC via a standard type A USB port. Note that the USB cable does not enable high speed data transfer, since the bit rate is limited by the serial interface of the

Service Port.

Installing the Driver for the USB Cable

Before taking the USB cable into use, you must install the provided USB driver on your PC. When installing the driver, you must acknowledge any security prompts that may appear.

1. Check that the USB cable is not connected. Disconnect the cable if you have already connected it.

2. Insert the media that came with the cable, or download the latest driver from www.vaisala.com/software/ .

3. Execute the USB driver installation program (setup.exe), and accept the installation defaults.

4. After the driver has been installed, connect the USB service cable to a USB port on your PC. Windows will detect the new device, and use the driver automatically.

5. The installation has reserved a COM port for the cable. Verify the port number, and the status of the cable, using the Vaisala USB

Instrument Finder program that has been installed in the

Windows Start menu.

Windows will recognize each individual cable as a different device, and reserve a new COM port. Remember to use the correct port in the settings of your terminal program.

84 ___________________________________________________________________ M210704EN-H


Using the Service Port

1. Open the screws on the transmitter cover, and open the cover.

2. Connect the desired cable (serial interface cable or USB cable) to your PC and the Service Port connector on the transmitter. For the

location of the Service Port, see Figure 57 on page 82.

3. Open a terminal program and set the communication settings as follows:

Table 14 Communication Settings for the Service Port

Parameter

Bauds

Parity

Data bits

Stop bits

Flow control

Value

19200

None

8

1

None

For instructions on setting up a terminal program connetion, , see

section Terminal Program Settings on page 93.

4. Power-up the DMT340.

LAN Communication

To enable LAN communication, a LAN or WLAN interface must be physically connected to the network, and the networking settings must be suitable for your network. For a description of interfaces, see sections

LAN Interface on page 64 and WLAN Interface on page 65.

The LAN and WLAN interfaces both operate by accessing the serial interface (User Port) of the transmitter. All commands and protocols that are available using the serial interface are available through the LAN and

WLAN interfaces; see section List of Serial Commands on page 96. For

instructions on how to connect using a terminal program, see section

Terminal Program Settings on page 93.

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IP Configuration

The IP settings of the LAN and WLAN interfaces are described in Table

15. The current settings can be viewed on the serial line or using the

device information display; see section Device Information on page 111.

Table 15 IP Settings for the LAN and WLAN Interfaces

Parameter

Automatic configuration

(DHCP)

Web configuration

IP Address

Netmask

Gateway

MAC

Description

If enabled, the transmitter will retrieve its network settings (including the IP Address) from a server in the network. If disabled, static network settings are used instead.

If enabled, the settings of the interface can be changed using a web browser. The configuration page can be accessed by browsing to the IP address of the transmitter.

The four part network ID of the transmitter. Must be set manually if automatic configuration is not used.

Example value: 192.168.0.222

Used together with the IP address to determine which network the transmitter is a part of. Must be set manually if automatic configuration is not used.

A common netmask is 255.255.255.0

IP address of the server that enables the transmitter to access other networks. Must be set manually if automatic configuration is not used.

Example value: 192.168.0.1

The MAC address is the unique hardware address of the LAN or WLAN interface. Cannot be changed.

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Using Display/Keypad

You can configure the IP settings of the LAN and WLAN interfaces using the display/keypad as follows:


2. Press the ► arrow button to select Interfaces.

3. Press the ► arrow button to select Network settings. There will be a delay as the transmitter refreshes the network information.

4. You are now in the Network Interface menu. Selecting the IP

configuration option opens the IP configuration menu.

1102-015

Figure 59 Network Interface Menu

The Network Interface menu also allows you to configure the

Communication Protocol, enable or disable the Web

configuration option, or Disconnect all users that are currently accessing the LAN or WLAN interface.

5. In the IP configuration menu, select Automatic configuration

(DHCP), or enter the IP address, Netmask and Gateway manually. If automatic configuration is enabled, manual configuration cannot be done.

0709-004

Figure 60 IP Configuration Menu

To enter a value manually, use the ▲▼ arrow buttons to select the parameter to change, and press Change. A cursor will appear in the first digit. Move the cursor using the ◄► arrow buttons, and change the value under the cursor using the ▲▼ arrow buttons.

Confirm the selection by pressing OK.

6. After configuring the desired parameters, press EXIT to apply the changes and return to the basic display.

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Use the serial line command NET to view or set the network settings for the LAN and WLAN interfaces. You can also refresh the network information or disconnect all active connections.

NET [REFRESH] [DISCONNECT] [DHCP WEB] [DHCP IP SUBNET

GATEWAY WEB]<cr> where

REFRESH = Updates the network information and displays it

DISCONNECT = Disconnects all current sessions

DHCP

WEB

= ON or OFF. Enables or disables the automatic IP configuration.

= ON or OFF. Enables or disables the Web

Configuration page.

IP

SUBNET

= The four part network ID of the transmitter. Must be set manually if automatic configuration is not used.

= Used together with the IP address to determine which network the transmitter is a part of. Must be set manually if automatic configuration is not used.

GATEWAY = IP address of the server that enables the transmitter to access other networks. Must be set manually if automatic configuration is not used.

Examples:

>net refresh

OK

DHCP : OFF

IP address : 192.168.0.101

Subnet mask : 255.255.255.0

Default gateway: 192.168.0.1

Web config. : OFF

MAC address : 00:40:9d:2c:d2:05

Status : Not connected

>

>net on off

DHCP : ON

IP address : 192.168.0.104

Subnet mask : 255.255.255.0


Web config. : OFF


Status : Connected

OK

>

88 ___________________________________________________________________ M210704EN-H


>net off 192.168.0.101 255.255.255.0 192.168.0.1 off

DHCP : OFF

IP address : 192.168.0.101

Subnet mask : 255.255.255.0


Web config. : OFF


Status : Connected

OK

>

Wireless LAN Configuration

The settings of the WLAN interface are described in Table 16. The

current settings can be viewed on the serial line or using the device

information display; see section Device Information on page 111.

- CCMP encryption is called AES in some networking products.

- The WLAN interface supports both WPA and WPA2 (also known as

802.11i) security when either WPA-PSK mode is selected.

- If your WLAN network is using some other security method than listed below, you must set up a temporary WLAN network with any of these settings and then use the web configuration to set WLAN

security settings for the actual network. See section Web

Configuration for LAN and WLAN on page 92.

Table 16

Parameter

SSID

Security type

Security key

Wireless LAN Settings

Description

The service set identifier (that is, network name) of the wireless network to connect to. 1

… 32 characters.

The security type of the wireless network. The options are:

OPEN

OPEN/WEP

WPA-PSK/TKIP

WPA-PSK/CCMP

All other choices except OPEN require a security key; see below.

The encryption key or passphrase that is used with an encrypted network.

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You can configure the Wireless LAN settings using the display/keypad as follows:


2. Press the ► arrow button to select Interfaces.

3. Press the ► arrow button to select Network settings. There will be a delay as the transmitter refreshes the network information.

4. Press the ► arrow button to select Wireless LAN settings.

0802-111

Figure 61 Wireless LAN Settings

5. The Name entry on the page shows the SSID of the currently selected wireless network. To change the SSID, press the SET button. Use the ▲▼ arrow buttons to change the character under the cursor, and ◄► arrow buttons to more the cursor. Press the

OK button when done.

0802-110

Figure 62 Entering Network SSID

6. To change the currently selected Network type, select the Type entry and press the Change button. Select the new type from the list and press the Select button.

0802-112

Figure 63 Selecting the Wireless Network Type

90 ___________________________________________________________________ M210704EN-H


7. If you have selected an encrypted network type (WEP or WPA), you must enter the security key to be used. Select the

Key/passphrase entry and press the Set button. Enter the key in the same way as the SSID, and press the OK button. With WEP encryption, you must enter the encryption key in hexadecimal (10 hexdecimals for 64-bit encryption or 26 hexadecimals for 128-bit encryption). A WPA key must be 8 … 63 ASCII characters.

8. After setting the wireless network parameters, press the Exit button in the Wireless LAN Settings menu. You will be asked to confirm the new settings. Note that when new settings are saved, all currently active WLAN connections are disconnected.


Use the serial line command WLAN to view or set the wireless network settings. If you set an encrypted network type, you will be asked to enter the security key. With WEP encryption, you must enter the encryption key in hexadecimal (10 hexdecimals for 64-bit encryption or 26 hexadecimals for 128-bit encryption) or with plain ASCII characters (5 characters for 64-bit encryption or 13 characters for 128-bit encryption).

A WPA key must be 8 … 63 ASCII characters.

WLAN [SSID TYPE]<cr> where

SSID

TYPE

= Network name in 1 … 32 characters

= Security type of the wireless network. The options are:

OPEN

OPEN/WEP

WPA-PSK/TKIP

WPA-PSK/CCMP

Examples:

>wlan ?

Network SSID : WLAN-AP

Type : OPEN

>

>wlan accesspoint wpa-psk/tkip

Network SSID : accesspoint

Type : WPA-PSK/TKIP

WPA-PSK phrase ? thequickbrownfox

Save changes (Y/N) ? y

OK

>

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Communication Protocol

When a Telnet connection is established via the LAN or WLAN interface, the session has the same communication mode, run interval, poll address and echo settings as the serial port (User Port) session would have.

These settings can be changed using the display/keypad, using the serial line (User Port or Service Port), or on-the-fly during the Telnet session.

The display menu path to the Communication Protocol settings is:

Main Menu ► Interfaces ► Network Interface ► Communication

Protocol.

The commands for changing the settings are SMODE, INTV, ADDR, and ECHO.

Web Configuration for LAN and WLAN

The LAN and WLAN interfaces both have a web configuration page that is accessible using a browser. If you have not disabled the page from the network settings, you can access it with a web browser at the IP address of the interface. You can check the currently assigned IP address of the

interface from the device information screens (see Device Information on page 111), or from the serial line by issuing the net ? command.

When accessing the web configuration page, you must first log in.

Username: user

Password: vaisala

The web configuration page provides similar network configuration options as the serial line and the display/keypad. It also has additional options for advanced users. For example, there are more options for securing the wireless network.

If these additional options are used, they will appear as custom configurations when viewed from the serial line or the display/keypad.

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NOTE

1102-017

Figure 64 Web Configuration Interface for WLAN

Terminal Program Settings

The instructions below describe how to connect to the DMT340 using the

PuTTY terminal application for Windows. Perform the necessary cabling and configuration of the transmitter before following the instructions.

PuTTY is available for download at www.vaisala.com/software .

PuTTY cannot be used to access the transmitter through the User Port if the transmitter is configured to use the Modbus protocol. However, you can always use PuTTY to access the transmitter through the Service Port.

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Opening a Serial/USB Connection

1. Power up the DMT340 and start the PuTTY application.

2. Select the Serial & USB settings category, and check that the correct COM port is selected in the Serial or USB line to connect

to field. Change the port if necessary.

If you are using a Vaisala USB cable, you can check the port it uses by clicking the USB Finder... button. This opens the Vaisala USB

Instrument Finder program that has been installed along with the

USB drivers.

3. Check that the other serial/USB line settings are correct for your connection, and change if necessary. The default settings (shown in

Figure 65 below) are used by the Service Port of the DMT340.

0810-070

Figure 65 Opening a Serial Connection

4. Click the Open button to open the connection window and start using the serial line.

If PuTTY is unable to open the serial port you selected, it will show you an error message instead. If this happens, restart PuTTY and check the settings.

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NOTE

Opening a Telnet Session (LAN/WLAN)

The instructions below assume that the LAN/WLAN interface on the transmitter is correctly configured and the network connection is already done.

1. Power up the instrument and start the PuTTY application. If your transmitter acquires a network address using DHCP, wait for a minute for this to complete, then verify the address from the transmitter.

2. In the Session window, select the Telnet connection type.

3. Enter the IP address of your transmitter in the Host Name (or IP

address) field. Use the default Telnet port 23.

0810-071

Figure 66 Opening a Telnet Connection

4. Click the Open button to open the connection window and start using the Telnet session.

If PuTTY is unable to connect the IP address you entered, it will show you an error message instead. If this happens, check the

IP address and the connections, restart PuTTY, and try again.

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List of Serial Commands

All commands can be issued either in uppercase or lowercase. In the command examples, the keyboard input by the user is in bold type.

The notation <cr> refers to pressing the carriage return (Enter) key on your computer keyboard. Enter a <cr> to clear the command buffer before starting to enter commands.

In the tables below, the bold text in the brackets is the default setting.

Table 17 Measurement Commands

Command

R

S

INTV [ 0 ... 255 S/MIN/H]

SEND [0 ... 255]

DSEND

SMODE

[STOP/RUN/POLL/MODBUS]

SDELAY

Description

Start the continuous outputting

Stop the continuous outputting

Set the continuous output Interval (for RUN mode)

Output the reading once

Output the reading once from all connected transmitters (in STOP or POLL mode)

Set the serial interface mode

SERI [baud p d s]

ADDR [0 ... 255]

NET

WLAN

OPEN [0 ... 255]

CLOSE

View or set User Port (RS232 or RS485) answer minimum delay

User Port settings (Default: 4800 E 7 1)

Set the transmitter address (for POLL and

MODBUS modes)

View or set networking parameters for LAN and WLAN interfaces

View or set wireless network parameters for

WLAN interface

Open a temporary connection to a POLL mode device

Close the temporary connection (returns to

POLL Mode)

Table 18 Formatting Commands

Command

FORM

FST

SCOM

FDATE

FTIME

Description

Set the output format of SEND and R commands

Add the state of AutoCal, purge and sensor warming to the outputs of the SEND and R commands

Assign a new command name that works like the SEND command (for example MEASURE)

Add date to R and SEND outputs

Add time to SEND and R outputs

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Table 19

Command

DIR

PLAY [0 ... 24]

[START END]

DSEL

DELETE

UNDELETE

Data Recording Commands

Description

Lists trend log files

Output recorded data file. Start and end times can only be specified if the data logger module is installed. The times must be given in the following format: yyyy-mm-dd hh:mm:ss

Select data recording and display quantities

(1 ... 4).

Delete all data files, including the memory of the optional data logger module

Recover the deleted files that have not been overwritten

Table 20

Command

PUR

PURGE

Purge Commands

Description

Purge settings

Start manual purge

Table 21

Command

AUTO

AUTOCAL

Table 22

Command

FCRH

IKØ

CT

ACAL

Autocalibration Commands

Description

AutoCalsettings

Start Autocal

Calibration and Adjustment Commands

Description

RH two-point adjustment

T d/f

one-point-adjustment

T one or two-point adjustment

Perform analog output adjustment

Table 23 Setting and Testing the Analog Outputs

Command

ASEL

ITEST

AMODE

AERR

ASCL

Description

Configure analog output quantities and scales

Test analog outputs

Display analog output mode

Change the error output

Analog output scaling

AOVER [ON/ OFF] Extend analog output range by 10%

Table 24

Command

RSEL

RTEST

Setting and Testing the Relays

Description

Configure relay settings

Test relays

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DATE

DSEND

ECHO

ERRS

FIND

HELP

LIGHT

LOCK

MODBUS

MODS

MOL/MOLI

PRES

RESET

TEST

TIME

UNIT

VERS

XPRES

Table 25 Other Commands

Command

?

??

ALSEL

CON

CDATE

CODE

CTEXT

Description

Output device information

Output device information in POLL-state

Set display alarms

Set display contrast

Adjust the output date/set date when adjustment enabled

Display the order configuration code of the transmitter

Display the adjustment information text/set information text when adjustment enabled

Set date.

Output the reading, also in poll mode.

Turn the serial interface echo ON/OFF

Display transmitter error messages

All devices in POLL mode send their addresses

List the currently available commands

Set the display backlight mode

Lock the menu or disable the keypad

View Modbus diagnostic counters

View information about connected modules

View/set molecular weight parameter

Set the value for pressure compensation

Reset the device

Self-diagnostics information

Set time

Display output units

Display the software version information

Set pressure (temporarily)

98 ___________________________________________________________________ M210704EN-H


Getting the Measurement Message from

Serial Line

Starting Continuous Outputting

Enter the R command to start the continuous output of measurements.

R<cr>

Example:

>r

Tdf=-20.6 'C H2O= 958 ppmV x= 0.6 g/kg

>r

Tdf=-20.7 'C H2O= 958 ppmV T= 23.8 'C RH= 3.3 %RH

If a value is too long to fit to the allocated space in the output, or if there is an error in outputting the quantity, the value is displayed with stars ‘*’.

You can change the format of the output with the following commands:

- Outputting interval can be changed with the INTV command.

- Output message format can be changed with the FORM command.

Stopping Continuous Outputting

Use the S command to end the RUN mode. After this command all other commands can be used. You can also press the Esc button or reset the transmitter to stop the outputting.

S<cr>

See command SMODE to change the default (power-up) operation mode.

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Outputting Reading Once

Use the SEND command to output the reading once in STOP mode. The output format depends on which parameters the transmitter can output.

SEND<cr>

Examples:

>send

Tdf= -5.8 'C H2O= 3715 ppmV x= 2.3 g/kg

>send

Tdf= -5.9 'C Td= -6.6 'C Tdfa= -5.9 'C Tda= -6.6 'C H2O=

3696 ppmV x= 2.3 g/kg RH= 13.9 %RH a= 2.7 g/m3 aNTP=

3.0 g/m3 T= 22.2 'C dT= 28.1 'C

Assign an Alias for the SEND Command

Use the SCOM command to assign a new command that works like the

SEND command. The standard SEND command of the transmitter will always function normally whatever the SCOM definition may be.

Command names are case-insensitive.

SCOM<cr>

Example (assigning the command MEASURE as an alias for the SEND command):

>scom

Send command : ? measure

>measure

Tdf= -5.8 'C H2O= 3715 ppmV x= 2.3 g/kg

>

You can remove the SCOM definition by pressing Esc when entering the command name:

>scom

Send command : measure ? <esc>

>

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Outputting Reading Once From All Transmitters

Use the DSEND command to output the reading once from all connected transmitters that are in STOP or POLL modes. In order to avoid data collisions, the transmitters will send their response after a suitable delay.

The response includes the transmitters’s address, followed by their measurement message.

NOTE The total execution time of the DSEND command depends on the bit rate of the serial port connection. At slow speeds, it will take a considerable amount of time for devices with a large address number to respond. The delay will be the same also when there are no other devices connected.

DSEND<cr>

Example (transmitters with addresses 3 and 25 responding):

>dsend

3 Tdf= -5.8 'C H2O= 3715 ppmV x= 2.3 g/kg

25 Tdf= -1.1 'C H2O= 5549 ppmV x= 3.5 g/kg

>

Communicating with a Transmitter in POLL

Mode

OPEN

When all transmitters on the RS-485 bus are in POLL mode, the OPEN command sets one transmitter temporarily to STOP mode so that other commands can be entered.

OPEN [aa] where aa = Address of the transmitter (0 ... 255)

CLOSE

The CLOSE command switches the transmitter back to the POLL mode.

Example:

>OPEN 2 (opens the line to transmitter 2, other transmitters stay in POLL mode)

>CRH

...

(for example, calibration performed)

>CLOSE (line closed)

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Formatting Serial Line Message

NOTE Instead of using the FTIME, FDATE and FST commands described in this section, you can use the FORM command with modifiers TIME,

DATE, and STAT. See section FORM on page 104.

FTIME and FDATE

The FTIME and FDATE commands will enable/disable output of time and date to the serial line. To add time to R and SEND outputs, enter:

FTIME [x]<cr>

To add date to R and SEND outputs, enter:

FDATE [x]<cr> where x = ON or OFF

Example:

>send


>ftime on

Form. time : ON

>send

23:08:27 Tdf=-20.6 'C H2O= 959 ppmV T= 23.9 'C RH= 3.3

%RH

>fdate on

Form. date : ON

>send

2000-01-31 23:08:46 Tdf=-20.6 'C H2O= 960 ppmV T= 23.9 'C

RH= 3.3 %RH

>

FST

Use the FST command to include the status of purge, sensor warming and AutoCal in the output ofthe SEND and R commands.

FST [x]<cr> where x = ON or OFF (default)

Example:

>fst on

Form. status : ON

>send

102 __________________________________________________________________ M210704EN-H

Chapter 4 _________________________________________________________________ Operation w 0 Tdf= 3.9 'C Td= 3.9 'C Tdfa= 3.9 'C Tda= 3.9 'C

H2O= 8045 ppmV x= 5.0 g/kg RH= 26.8 %RH a= 5.9 g/m3 aNTP= 6.4 g/m3 T= 24.1 'C dT= 20.3 'C

>purge

Purge started, press any key to abort...

>send

S 120.3 Tdf= 3.8 'C Td= 3.8 'C Tdfa= 3.8 'C Tda= 3.8 'C

H2O= 7999 ppmV x= 5.0 g/kg RH= 12.5 %RH a= 5.6 g/m3 aNTP= 6.4 g/m3 T= 37.4 'C dT= 33.6 'C

> where the state of the probe is indicated by the following letters and values: w...xxx = Sensor warming where xxx = Sensor heat power

(0 when not warming)

H...xxx = Purge

S...xxx = Sensor cooling where xxx = Sensor temperature (ºC) where xxx = Sensor temperature (ºC) after purge

A...xxx = AutoCal where xxx = Sensor temperature (ºC)

General Settings

Changing the Quantities and Units

To change quantities and units use serial commands or the optional

display/keypad. See Table 2 on page 18 for available quantities and

Table 3 on page 18 for optional quantities.

NOTE Only the quantities selected when ordering the device can be selected as an output quantity.


Use display/keypad to select the display output quantities.


2. Press the ► arrow button to select Display.

3. Press ► arrow button to select Quantities.

4. Select the quantity by using the ▲▼ arrow buttons. Confirm the selection by pressing SELECT. You can select 1 ... 4 display quantities at a time.


To select display units:.


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2. Press the ► arrow button to select Display.

3. Use the ▲▼arrow buttons to select Units. Confirm the selection by pressing the right-hand arrow button.

4. Use the ▲▼ arrow buttons to select display units. Confirm the selection by pressing CHANGE. The unit changes from metric to non-metric or the other way round.


NOTE Changing the units by using the display/keypad has no effect on the serial output units.


Use the serial line command FORM to change the format, and the command UNIT to select metric or non-metric output units.

FORM

Use the serial line command FORM to change the format or select certain quantities for the output commands SEND and R.

FORM [x]<cr> where x = Formatter string

The formatter string consists of quantities and modifiers. If no formatter string is entered, the command will display the currently active formatter string. Note that the hash symbol "#" is shown as a backslash "\" when viewing the current formatter string.

When entering the command, use the abbreviations of the quantities. For

more information on quantities, see Table 2 on page 18 and Table 3 on

page 18. The modifiers are presented in Table 26 below.

Table 26 FORM Command Modifiers

Modifier x.y

#t

#r

#n

“"

#xxx

U5

ADDR

ERR

STAT

Description

Length modifier (number of digits and decimal places)

Tabulator

Carriage-return

Line feed

String constant

Special character, code "xxx" (decimal), for example #027 for ESC

Unit field and length (length optional)

Transmitter address [00...255]

Error flags for P, T, Ta, RH [0000 ... 1111], 0 = no error

Transmitter status in 7 character field, for example:

N 0 no heating

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Modifier

SN

TIME

DATE

CS2

CS4

CSX

Description h 115

H 159.0

S 115.0 probe heating active, power 115/255 purge heating active, temperature 159ºC purge cooling active, temperature 115ºC sensor heating active, temperature 95ºC X 95.0

Transmitter serial number

Time [hh:mm:ss]

Date [yyyy-mm-dd]

Modulus-256 checksum of message sent so far, ASCII encoded hexadecimal notation

Modulus-65536 checksum of message sent so far, ASCII encoded hexadecimal notation

NMEA xor-checksum of message sent so far, ASCII encoded hexadecimal notation

Example:

>form "Td=" 4.2 rh U5 #t "T=" t U3 #r #n

Td= 3.30ºC T= 22.18'C

>send

Td= 3.30ºC

Tfrost= -21.6'C

>

T= 22.18'C

>form "Tfrost=" tdf U3 #t "Temp=" t U3 #r#n

Temp= 22.2'C

The command ‘FORM /’ will return the default output format. The default output format depends on the device configuration.

>form /


>

UNIT

Use the UNIT command to select metric or non-metric output units, and change the unit for the H2O quantity:

UNIT [x]<cr> where x = Unit system to be used. Options are:

M (metric units)

N (non-metric units)

UNIT H2O [y]<cr> where y = Unit to be used for H20. Options are:

PPMV (parts per million by volume)

PPMW (parts per million by weight)

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NOTE

NOTE

NOTE

This command changes both the serial output and display units. When you want to output both metric and non-metric units simultaneously on the display, select the display units later by using the display/keypad.

Examples:

>unit m

Output units : metric

>unit h2o ppmv

H2O units : ppmV

>

Use the MOL/MOLI command to view/set mole weight parameter that will be used in calculating H

2

O ppm w.

Pressure Compensation Setting

The pressure has an effect on humidity calculations and accuracy.

Therefore, accurate calculations can be achieved only when the process pressure is taken into consideration.

Note that conversions from mmHg and inHg are defined at 0°C and for mmH

2

O and inH

2

O at 4°C.

Pressure compensation is intended to be used in normal air only. When measuring in other gases, please contact Vaisala for further information.

Fixed pressure compensation value of 1013.25 hPa is used when in adjustment mode.


Use the display/keypad to set the pressure compensation. For instructions on selecting the pressure unit using the display/keypad, see section

Changing the Quantities and Units on page 103.


2. Select Measuring and press the ►arrow button to confirm your selection.

3. Select Pressure compensation and press the ►arrow button to confirm you selection.

4. Press SET and enter the pressure value by using the arrow buttons.

5. Press OK and EXIT to return to the basic display.

106 __________________________________________________________________ M210704EN-H


Using Buttons on the Motherboard

Pressure set buttons (P chk

and P set

) can be used to set the process pressure.

0504-052

Figure 67 Pressure Set Buttons on the Motherboard


1 = Pressure set button

2 = Pressure check button

Press the check button (P pressure setting in bar a chk

) and a red LED will flash the current

. One flash equals one bar a

.

Press the set button (P equals the number of bar bar a set

) to set the pressure value. The number of presses a

to be set (for example, three presses = three

). After a few seconds, the red LED will confirm the setting by flashing the new pressure value.


XPRES and PRES

The XPRES command must be used if the value is changed frequently

(for example, by an automatic system that updates the value). Its value is not retained at reset, and when set to 0; the last value set with PRES is used instead. Use the serial line and set the following:

PRES [aaaa.a]<cr>

XPRES [aaaa.a]<cr> where aaaa.a = Absolute process pressure (hPa)

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Example:

>pres

Pressure : 1013.00 hPa ?

>pres 2000

Pressure : 2000.00 hPa

>

Table 27 Conversion Factors for Pressure Units

From mbar

PaN/m2 mmHg torr inHg mmH

2

O inH

2 atm

O at bar psia 1)

1) Psia = psi absolute.

To: hPa

1

0.01

1.333224

33.86388

0.09806650

2.490889

1013.25

980.665

1000

68.94757

Example:

29.9213 inHg = 29.9213 x 33.86388 hPa = 1013.25 hPa

Date and Time


If the optional Data Logger Module is installed, you can change the time and date using the display/keypad.


2. Select System and press the ►arrow button to confirm your selection.

3. Select Date and time and press the ►arrow button.

4. Press the SET button to enter the adjustment mode, and use the arrow buttons to select and change the values.

5. You can also change the date and time formats that are shown in the graphs. The selected formats are only used in graphical displays, they do not change the formats that are used in serial communication.


108 __________________________________________________________________ M210704EN-H



To set time, enter the TIME command. To set date, enter the DATE command.

TIME<cr>

DATE<cr>

These time and date settings are shown on the timestamps of the PLAY command. When you want to include time and date in the R and SEND command outputs, use the FTIME and FDATE commands.

Example:

>time

Time : 13:42:49 ?

>date

Date : 2007-05-31 ?

NOTE If the optional Data Logger Module is not installed, time and date available on the serial ports (only) are cleared to 2000-01-01 00:00:00 at reset or at power failure.

Data Filtering

The averaging data filter calculates a average over a certain period of time. The lowest measurement noise is achieved with the extended filtering. There are three filtering levels available.

Table 28 Filtering Levels

Setting

OFF

STANDARD

EXTENDED

Filtering Level

No filtering.

Standard filtering, enabled by default.

Approximately 13 s moving average.

Extended filtering. Approximately 1 min average by default, but configurable on the serial line.

Use display/keypad to set the filtering level.


2. Select Measuring by pressing the ► arrow button.

3. Select Filtering and press CHANGE to confirm your selection.

4. Select Off/Standard/Extended and press SELECT to confirm your selection.


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FILT

Use the serial line command FILT to set the filtering level.

FILT [level] [extfactor]<cr> where level = Filtering level. The options are:

OFF (no filtering)

ON (standard filtering, enabled by default.

Approximately 13 s moving average)

EXT (extended filtering, approximately 1 min average by default but configurable by changing the extfactor) extfactor = Weighted average factor for extended filtering level.

Range 0 ... 1, default 0.030.

In extended filtering mode, the output is calculated based on the following formula:

[(new result * extfactor) + (old result * (1.0 - extfactor))]

This means that with extfactor value 1 the transmitter will take only the latest measurement into account, but with extfactor value 0.1 a new output is a combination of the previous output (90%) and the latest measurement

(10%).

Example (enable extended filtering):

>filt ext

Filter : EXT

>

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Device Information

Use the display/keypad or the serial line to display the device information.

Press the INFO button in the basic display to see the following information:

- Current sensor operation (for example, AutoCal or Purge) in progress

- Present or past unacknowledged errors

- Device information

- Current date and time (only shown if data logger module installed)

- Adjustment information fed by the user

- Measuring settings

- Information on Purge settings

- Display Alarm settings

- Serial interface information

- Network settings and status of the LAN and WLAN interfaces

- Analog output information

- Relay output information

1103-064

Figure 68 Device Information on Display

Proceed in the information views by pressing the MORE button repeatedly until you get to the desired information. You can also browse through the information displays with the arrow buttons. Press OK to return to the basic display.

Use the serial line command ? to check the current transmitter configuration. The command ?? is similar but can also be used if the transmitter is in POLL mode.

?<cr>

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Example:

>?

DMT340 / 5.10.0

Serial number : D1140055

Batch number : D0750008

Adjust. date : 2008-03-17

Adjust. info : Helsinki / FIN

Date : 2000-01-02

Time : 01:33:57

Serial mode : STOP

Baud P D S : 19200 N 8 1

Output interval: 10 s

Address : 0

Echo : ON

Pressure : 1013.25 hPa

Filter : OFF

Ch1 output : 0...1V

Ch2 output : 0...1V

Ch1 Tdf low : -20.00 'C

Ch1 Tdf high : 100.00 'C

Ch2 H2O low : 0.00 ppmV

Ch2 H2O high : 5000.00 ppmV

Module 1 : not installed

Module 2 : not installed

>

LIGHT

Use the LIGHT command to view or set the backlight mode of the display (optional). Issuing the command without specifying a mode shows the current backlight mode.

LIGHT [mode]<cr> where mode = Operating mode of the display backlight. The options are:

ON (backlight always on)

OFF (backlight always off)

AUTO (backlight automatically turns on and off when keypad is used)

Example:

>light

Backlight : OFF

>light auto

Backlight : AUTO

>

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HELP

Use the HELP command to list the currently available commands. The available commands are determined by the device configuration and installed options.

Example:

>help

? ACAL ADDR AERR ALSEL

ASEL AUTO AUTOCAL CDATE CLOSE

CON CT CTEXT DATE DELETE

DIR DSEL DSEND ECHO ERRS

FCRH FILT FORM HELP IK0

INTV ITEST LIGHT LOCK MODBUS

MODS MOL MOLI NET PLAY

PRES PUR PURGE R RESET

SCOM SDELAY SEND SMODE SYSTEM

TEST TIME UNDELETE UNIT

XPRES

VERS

>

ERRS

Use the ERRS command to display transmitter error messages (see Table

32 on page 151).

Example (no active errors):

>errs

No errors

>

Example (showing active error):

>errs

Error: E2 Humidity sensor open circuit.

>

MODS

Use the MODS command to display information about the optional modules that are connected to the transmitter.

Example:

>mods

Module 1 : WLAN-1 (POST: release_82000941_J; FW:

Version 82000977_K1 10/16/2008)

Module 2 : LOGGER-1 (1024 MB; HW: B; SW: 5)

>

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VERS

Use the VERS command to display software version information.

Example:

>vers

DMT340 / 5.10

>

Resetting the Transmitter Using Serial

Line

RESET

The RESET command resets the transmitter. The User Port switches to the start-up output mode selected with the SMODE command .

Locking Menu/Keypad Using Serial Line

LOCK

Use the LOCK command to prevent the user from entering the menu using the keypad, or to lock the keypad completely. You can optionally set a 4-digit PIN code, for example 4444.

If a PIN code has been set, the user will be prompted to enter the code when trying to access the menu. Entering the code correctly will disable the lock until the user returns back to the basic view.

LOCK [x] [yyyy]<cr> where x = Keypad locking level, range 0 ... 2. The options are:

0 - No lock (enables full access)

1 - Menu locked, but graphs are accessible

2 - Keypad completely disabled yyyy = 4-digit PIN code. The code can only be set when the keypad locking level is 1.

114 __________________________________________________________________ M210704EN-H


Examples:

>lock 1 4444

Keyboard lock : 1 [4444]

>

>lock 1

Keyboard lock : 1

>

Serial Output Settings

The communication settings for the User Port can be changed via the serial line or by using the optional display/keypad. The communication settings for the Service Port are fixed and not changeable.

NOTE If a communication module (LAN, WLAN, or RS-422/RS-485 interface) has been installed, the User Port is not accessible. Any changes to the settings are applied to the interface provided by the module, if applicable.



2. Select Interfaces and press the ►arrow button to confirm your selection.

3. Select Serial interface and press the ►arrow button to confirm your selection.

4. Select Bit rate and Serial format by pressing the CHANGE button. Use the ▲▼ arrow buttons to select and press SELECT to confirm your selection.

5. Select the Protocol to be used by the serial output by pressing the

CHANGE button. Select the option using the ▲▼ arrow buttons and press SELECT. This is the same serial mode setting that is changed by the SMODE serial command.

- RUN mode continuously outputs the measurement message at the set interval. If you select the RUN mode, set the desired

RUN interval also.

- POLL mode enables multiple transmitters to share the same RS-

485 line. If you select the POLL mode, select the Device

address also, as each transmitter on the line must have an unique address.

- In STOP mode, transmitter remains silent after reset or power up, waiting for commands.

- In MODBUS mode, only Modbus protocol communication is

available. See Chapter 5, Modbus, on page 141.

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NOTE

6. Select the RUN interval and the unit. Press OK to confirm.

7. Select the Device address and press SET to confirm.

8. Select ECHO, and press ON to turn to it on or OFF to turn it off.


The new User Port settings set using the display/keypad are effective immediately.


You can use the serial commands to change/view the User Port settings even if you are currently connected to the Service Port.

SERI

Use the SERI command to set the communication settings for the User

Port. Changed settings will be activated at next reset or power up.

SERI [b p d s]<cr> where b = Bit rate (110, 150, 300, 600, 1200, 2400, 4800, 9600,19200,

38400, 57600, 115200) p = Parity (n = none, e = even, o = odd) d = Data bits (7 or 8) s = Stop bits (1 or 2)

The settings can be changed one parameter at a time or all parameters at once.

Example (changing all parameters):

>SERI 600 N 8 1

600 N 8 1

>

Example (changing parity only):

>SERI O

4800 O 7 1

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SMODE

Use the SMODE command to set the User Port start-up operating mode.

SMODE [xxxx]<cr> where xxx = STOP, RUN, POLL, or MODBUS.

Table 29 Selection of Output Modes

Mode

STOP

RUN

POLL

Measurement Output Available Commands

Only with the SEND command. All (default mode).

Automatic output.

Only with the SEND [addr] command.

Only command S.

SEND [addr] and OPEN [addr].

Other commands available after opening a line to the transmitter

MODBUS Must be read from the transmitter using Modbus protocol. using the OPEN command.

Use with RS-485 buses where multiple transmitters can share the same line.

Modbus protocol only; see

Chapter 5, Modbus, on page 141.

Selected output mode will be activated at next reset or power up.

ADDR

Use the ADDR command to set the device address of the transmitter.

Addresses are required for POLL mode and MODBUS mode (serial

Modbus).

ADDR [aa]<cr> where

aa = Device address of the transmitter, range 0 ... 255 (default = 0)

Example (changing the transmitter address from 0 to 52):

>addr

Address : 0 ? 52

>

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INTV

Use the INTV command to set the RUN mode output interval. The time interval is used only when the RUN mode is active. Setting the interval to zero enables the fastest possible output rate.

INTV [xxx yyy]<cr> where xxx = Delay, range 0 ... 255. yyy = Unit: S, MIN or H.

Example (setting the output interval to 10 minutes):

>intv 10 min

Output interval: 10 min

>

SDELAY

With the SDELAY command you can set the delay (response time) for

User Port, or view the currently set delay value. Adjusting the delay may be needed when half-duplex communication (typically two-wire RS-485) is used.

The delay value corresponds to tens of milliseconds (for example, 5 =

0.050s minimum answer delay). The value can be set between 0 ... 254.

Example:

>sdelay

Serial delay : 0 ? 10

>sdelay

Serial delay : 10 ?

ECHO

Use the ECHO command to set the User Port echo. The command either enables or disables echo of characters received.

ECHO [x]<cr> where x = ON (enabled, default) or OFF (disabled)

NOTE When using the RS-485 interface with a 2-wire connection, always disable echo. When using RS-232, RS-422/485 4-wire connection, LAN, or WLAN, you can enable or disable echo as you wish.

118 __________________________________________________________________ M210704EN-H


Data Recording

The data recording function is always on and collects data automatically into the memory of the device. If the optional data logger module is installed, the transmitter uses it automatically. Recorded data does not disappear from the memory when the power is switched off. Collected data can be observed in graph form in the graphical view of the display, or it can be listed out by using the serial line or MI70 Link program.

Selecting the Data Recording Quantities

If the transmitter is equipped with the optional display, the recorded quantities are always those selected for the display. Up to four quantities

can be recorded at a time. See section Changing the Quantities and Units on page 103 for instructions on how to select the display quantities with

the keypad.

DSEL

Use the serial line command DSEL [xxx] to select the quantities to be recorded if the transmitter is not equipped with display/keypad.

DSEL [xxx]<cr> where

xxx = Data recording quantity. See Table 2 and Table 3 on page 18

for the quantities.

Enter the command without parameters and press ENTER to display the current recording parameters.

Example:

>dsel rh t tdf

RH T Tdf

View Recorded Data

If the device is provided with the optional display, the graphical display shows the data of the selected quantities, one at a time. See section

Graphic History on page 71 for more information on the graphical

display.

DIR

Use the serial line and enter the DIR command to check the available files.

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DIR<cr>

Without the data logger module, the transmitter records five files (five observation periods) for each selected quantity. The data logger raises the number of recorded files to six for each quantity. Thus, the total amount

of the files varies between 5 and 24. See Table 10 on page 71.

Select, for example, two quantities (T and T df

). The last column illustrates the number of data points that has been stored in the file.

Example (data logger module installed):

>dir

File description Oldest data available

1 T (90 s intervals) 2007-05-30 05:25:30

2 T (12 min intervals) 2007-05-29 05:48:00

3 T (2 h intervals) 2007-05-19 02:00:00

4 T (12 h intervals) 2007-03-23 12:00:00

5 T (3 d intervals) 2006-04-20 00:00:00

6 T (12 d intervals) 2002-12-16 00:00:00

7 Tdf (90 s intervals) 2007-05-30 05:25:30

8 Tdf (12 min intervals) 2007-05-29 05:48:00

9 Tdf (2 h intervals) 2007-05-19 02:00:00

10 Tdf (12 h intervals) 2007-03-23 12:00:00

11 Tdf (3 d intervals) 2006-04-20 00:00:00

12 Tdf (12 d intervals) 2002-12-16 00:00:00

>

No. of points

1555200

194400

19440

3240

540

135

1555200

194400

19440

3240

540

135

Example (without data logger module):

>dir

File description Oldest data available

1 T (90 s intervals) 2008-04-11 20:41:11

2 T (12 min intervals) 2008-04-10 21:03:41

3 T (2 h intervals) 2008-03-31 18:03:41

4 T (12 h intervals) 2008-02-04 12:03:41

5 T (3 d intervals) 2007-03-04 00:03:41

6 Tdf (90 s intervals) 2008-04-11 20:41:11

7 Tdf (12 min intervals) 2008-04-10 21:03:41

8 Tdf (2 h intervals) 2008-03-31 18:03:41

9 Tdf (12 h intervals) 2008-02-04 12:03:41

10 Tdf (3 d intervals) 2007-03-04 00:03:41

>

No. of points

135

135

135

135

135

135

135

135

135

135

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NOTE

PLAY

Use the PLAY command to output the selected file to the serial line. If the data logger module is installed, you can specify an interval to be outputted.

Data in the output is <TAB> delimited. This is compatible with most spreadsheet programs. Before giving the command, set the local date and time with TIME and DATE commands, if needed.

PLAY [x] [start_date start_time end_date end_time]<cr> where x = Number of the data file that will be outputted, range

0...18. The numbers correspond to the output of the DIR

command; refer to the example on page 119.

Selecting number 0 will output all data files. start_date = Starting date of the interval to be outputted. Must be given in the following format: yyyy-mm-dd. start_time = Starting time of the interval to be outputted. Must be given in the format hh:mm:ss or h:mm. end_date = Ending date of the interval to be outputted. Must be given in the following format: yyyy-mm-dd. end_time = Ending time of the interval to be outputted. Must be given in the format hh:mm:ss or h:mm.

Example:

>play 7 2007-05-05 00:00:00 2007-05-06 00:00:00

Tdf (12 min intervals) 2007-05-05 00:00:00 121

Date Time trend min max yyyy-mm-dd hh:mm:ss 'C 'C 'C

2007-05-05 00:00:00 -22.60 -22.63 -22.57

2007-05-05 00:12:00 -22.55 -22.58 -22.53

2007-05-05 00:24:00 -22.50 -22.53 -22.45

2007-05-05 00:36:00 -22.43 -22.45 -22.41

2007-05-05 00:48:00 -22.35 -22.41 -22.32

2007-05-05 01:00:00 -22.31 -22.33 -22.29

...

Output of large amounts of recorded data can result in huge data files and take a long time, up to several days for the entire memory of the data logger. To make it easier to process the data it is recommended to select the largest suitable data interval, and to specify the start and end times carefully.

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Deleting the Recorded Files

You can delete the recorded data files using the keypad/display, or the

DELETE command on the serial line. The deletion is always done for all data; you cannot delete individual files.

Note that the transmitter automatically overwrites the old data when the memory is full, so manual deletion of the recorded files is not necessary in normal use.

To delete the data files using the keypad/display:

1. Press any of the arrow buttons to open the Main Menu.


3. Select Clear graph memories by pressing the CLEAR button.

Press the YES button to confirm the selection.

CAUTION This function clears the entire data history of the transmitter, including all graphs and the content of the optional data logger module.

UNDELETE

Similarly to the DELETE command, the UNDELETE command is used without any arguments. It will recover all deleted data that has not been overwritten yet.

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Analog Output Settings

The analog outputs are set in the factory according to the order form. In case you want to change the settings, follow these instructions. See

section Third Analog Output on page 56.

Changing the Output Mode and Range

Both output channels have their own DIP switch module with 8 switches,

see the position in Figure 2 on page 21 (DIP switches for analog output

settings).

1. Select the current/voltage output by switching ON either switch 1 or 2.

2. Select the range by switching ON one of the switches from 3 to 7.

NOTE

0503-045

Figure 69 Current/Voltage Switches of Output Modules


1 = Current/voltage selection output switches (from 1 to 2)

2 = Current/voltage range selection switches (from 3 to 7) in analog output 1 and 2

3 = Switches for service use only. Keep in OFF position always.

Only set one mode and one range switch to ON for one output channel.

The rest of the switches must remain OFF.

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NOTE

Example: 0 ... 5 V voltage output selected for channel 1 and 4...20 mA selected for channel 2.

8 █

OFF

█

█

█

ON

█

Selection

Voltage output selected

0 ... 5 V selected

Current output selected

4 ... 20 mA selected

If you have customized the error output setting (AERR), check that the set error values are still valid after changing the output mode/range. See

section Analog Output Fault Indication Setting on page 127.

Analog Output Quantities

Use the display/keypad to change and scale the analog output quantities.


2. Select Interfaces by pressing the ► arrow button.

3. Select Analog outputs by pressing the ► arrow button.

4. Select Output 1/2/3 by pressing the ► arrow button.

5. Select Quantity by pressing the ▲▼ arrow buttons. Confirm your selection by pressing CHANGE.

6. Select the quantity by using the arrow buttons. Press SELECT to confirm your selection.

7. Select Scale, lower limit, by pressing the ▲▼arrow buttons. Press

SET to confirm your selection. Press OK to store the setting.

8. Select the upper limit by pressing the ▲▼arrow buttons. Use the arrow buttons to set the upper limit value. Press SET to confirm your selection. Press OK to store the setting.


124 __________________________________________________________________ M210704EN-H


AMODE/ASEL

Use the serial line to select and scale the analog output quantities. Check the analog output modes with the AMODE command.

AMODE<cr>

Example:

>amode

Ch1 output : 0...1V

Ch2 output : 0...1V

>

Select and scale the quantities for the analog outputs with the command

ASEL. Note that the optional quantities can be selected only if they have been selected when ordering the device.

ASEL [xxx yyy zzz]<cr> where xxx = Quantity of channel 1 yyy = Quantity of channel 2 zzz = Quantity of the optional analog output channel 3

Always enter all the quantities for all outputs. For quantities and their

abbreviations, see Table 2 on page 18.

Use the ASEL command as shown in the example below when using a device with two analog outputs.

Example:

>asel td t

Ch1 Td low : -20.00 'C ?

Ch1 Td high : 100.00 'C ?

Ch2 T low : -40.00 'C ?

Ch2 T high : 180.00 'C ?

>

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Analog Output Tests

Use the display/keypad to test the operation of the analog outputs by forcing the outputs to known values. Measure then the values with a current/voltage meter.

Use the display/keypad for testing.



3. Select Diagnostics by pressing the ► arrow button.

4. Select Analog output tests by pressing the ► arrow button.

5. Select one of the testing options Force 0%/50%/100% of scale.

Press TEST to confirm your selection. All outputs are tested simultaneously. The actual output value depends on the selected range.

6. Press OK to stop testing. Press EXIT to return to the basic display.

ITEST

Use the ITEST command to test the operation of the analog outputs. The

ITEST command forces the analog outputs to entered values. The analog outputs remain at these values until you enter the command ITEST without parameters or reset the transmitter.

ITEST [aa.aaa bb.bbb cc.ccc]<cr> where

aa.aaa = Current or voltage value to be set for channel 1 (mA or V)

bb.bbb = Current or voltage value to be set for channel 2 (mA or V)

cc.ccc = Current or voltage value to be set for channel 3 (optional)

(mA or V)

Example:

>itest 20 5

Ch1 (Td ) : * 20.000 mA H'672A

Ch2 (T ) : * 5.000 mA H'34F9

>itest

Ch1 (Td ) : -23.204 'C 16.238 mA H'FFFE

Ch2 (T ) : 22.889 'C 8.573 mA H'5950

>

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NOTE

NOTE

Analog Output Fault Indication Setting

The factory default state for analog outputs during error condition is 0 V/

0mA. If you select a new error value, take care to check that the new error state of the transmitter does not cause unexpected problems in process monitoring.

Use the display/keypad to set the analog output fault indication.


2. Select Interfaces by pressing the ► arrow button.

3. Select Analog Outputs by pressing the ► arrow button.

4. Select Output 1/2/3 by pressing the ► arrow button.

5. Select Fault indication. Press SET to confirm your selection.

Enter the fault indication value by using the arrow buttons. Press

OK to confirm your setting. This value is outputted if a transmitter error occurs.


AERR

Use the serial line AERR command to change the error output.

AERR<cr>

Example:

>aerr

Ch1 error out : 0.000V ? 5.0

Ch2 error out : 0.000V ? 5.0

>

The error output value must be within a valid range for the output type.

The error output value is displayed only when there are minor electrical faults such as a humidity sensor damage. When there is a severe device malfunction, the error output value is not necessarily outputted.

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Extend Analog Output Range

Use the AOVER command to allow the analog output channels to exceed their specified range by 10%. The scaling of the parameter remains as before; the extra range is used for additional measurement range in the high end of the scale.

AOVER [ON/OFF]<cr>

Example:

>aover on

Extended output: ON

>

The following example illustrates how the analog output is affected.

Channel 2 outputs temperature (T) with voltage output 0 … 5 V

(0 … 60 °C). After giving the AOVER ON command, the range is

0 … 5.5 V (0 … 66 °C). Note that the 60 °C point is still at 5 V.

Operation of Relays

Quantity for Relay Output

A relay monitors the quantity chosen for the relay output. Any of the quantities available can be chosen.

Measurement-Based Relay Output

Modes

Relay Setpoints

When the measured value is between the "above" and "below" values, the relay is passive. When choosing lower value as "above" value and higher value as "below" value, the relay is passive when the measured value is not between the setpoints. You can also set only one setpoint.

See Figure 70 on page 129 for examples of the different measurement-

based relay output modes.

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NOTE

Figure 70 Measurement-Based Relay Output Modes

1102-007

Mode 4 is usually used if an alarm needs to be triggered when the measured value exceeds a safe range. The relay is active when the measurement is in range, and is released if the value goes out of range or the measurement fails.

If the measurement of the selected quantity fails or the transmitter loses its power, the relay is released.

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NOTE

Hysteresis

The hysteresis function is designed to prevent the relay switching back and forth when the measured value is near to the setpoint values.

The relay is activated when the measured value passes the exact value of the setpoint. When returning and passing the setpoint again the relay is released only until the value reaches the setpoint increased/decreased by the hysteresis value.

Hysteresis should be smaller than the difference of the setpoints.

Example: When the 'active above' value is -30 ºC and the hysteresis value is 2 ºC, the relay activates when the dewpoint reaches -30 ºC. As the dewpoint then decreases, relay releases at -32 ºC.

>rsel tdf t

Rel1 Tdf above: - ? -30

Rel1 Tdf below: -30.00 'C ? -

Rel1 Tdf hyst : 5.00 'C ? 2

Rel1 Tdf enabl: ON ?

Rel2 T above: 30.00 'C ?

Rel2 T below: 20.00 'C ?

Rel2 T hyst : 1.00 'C ?

Rel2 T enabl: ON ?

>

If both setpoints are specified and "above" setpoint is lower than

"below" setpoint, the hysteresis works in the opposite direction, that is, relay is released when the measured value passes the exact value of the setpoint.

Relay Indicating Transmitter Error Status

You can set a relay to follow the operation status of the device. By selecting FAULT/ONLINE STATUS for output quantity a relay changes state on the basis of the operation status as follows:

FAULT STATUS

Normal operation: relay active (C and NO outputs are closed)

Not measuring state (error state or power off): relay released (C and NC outputs are closed)

130 __________________________________________________________________ M210704EN-H


ONLINE STATUS

Live measurement (data available): relay active (C and NO outputs are closed)

No live data (for example: error state, sensor purge or adjustment mode): relay released (C and NC outputs are closed)

See Figure 71 below for examples of the FAULT/ONLINE STATUS

relay output modes.

NOTE

Figure 71 FAULT/ONLINE STATUS Relay Output Modes

1102-040

FAULT/ONLINE STATUS relays are usually used in conjunction with an analog output to obtain validity information for the output value.

If the transmitter loses its power, all status-based relays are released similarly to the case of an instrument failure.

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Table 30 Relay State Examples

Criterion for

Relay Activation

Not chosen

Transmitter

Operation Status

NC-C

Connected

NO-C

Connected

Power off

T d/f

below -10 °C*

T d/f

above -10 °C *

Measured T d/f above -10 °C

Measured T d/f below -10 °C

Measured T d/f above -10 °C

Measured T d/f below -10 °C

Measurement OK

Fault status

Error active

Measurement live

Online status Purge, AutoCal, or sensor warming active

* Hysteresis has an effect when relay switching is based on live measurement.

See section Hysteresis on page 130.

Enabling/Disabling the Relays

You can deactivate the relay outputs for example for service purposes of your system.

Operation of the Indication LEDs

Relay is activated: LED is lit.

Relay is not activated: LED is not lit.

132 __________________________________________________________________ M210704EN-H


Setting the Relay Outputs

NOTE When you have only one relay module installed, its relays are called

“relay 1” and “relay 2”.

When you have two relay modules, the relays of the module connected to slot MODULE 1 are called “relay 1” and “relay 2” and relays connected to slot MODULE 2 are called “relay 3” and “relay 4”.

0706-013

Figure 72 Relay Availability


1 = Lists enabled relays. Activation state shown in black. Disabled relays are not shown.

Use the display/keypad to set the relay outputs.


2. Select Interfaces, confirm by pressing the ►arrow button.

3. Select Relay outputs, confirm by pressing the ►arrow button.

4. Select Relay 1/2/3/4, confirm by pressing the ►arrow button.

5. Select the Quantity, confirm by pressing Change. Set the quantity with the arrow buttons. Confirm your selection by pressing Select.

(Press Fault Status when the relay follows the transmitter error.)

Press Change to set the value.

6. Select Act. above / Act. below. Press SET to confirm your selection. If asked, select MODIFY if you want to set the setpoint by using the arrow buttons. Select REMOVE if you want to remove the setpoint.

7. Select Hysteresis and press SET. Set the hysteresis by using the arrow buttons. Press OK.

8. Select Relay enable and press ON/OFF to enable/disable the relay.

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RSEL

Use the serial line command RSEL to select the quantity, setpoints and hysteresis or enable/disable the relay outputs.

RSEL [q1 q2 q3 q4]<cr> where

q1 = Quantity for the relay 1 or Fault/Online




Factory setting: All relays disabled. Use the quantity abbreviations

presented in Table 2 on page 18 and Table 3 on page 18.

Example of window limit switch (upper and lower setpoints for control parameter): Selecting relay 1 to follow dewpoint/frost point temperature measurement and relay 2 to follow temperature measurement. Two relay setpoints are set for both relays.

>rsel tdf t

Rel1 Tdf above: - ? -10

Rel1 Tdf below: - ? -30

Rel1 Tdf hyst : 0.00 'C ? 5

Rel1 Tdf enabl: OFF ? on

Rel2 T above: - ? 30

Rel2 T below: - ? 20

Rel2 T hyst : 0.00 'C ? 1

Rel2 T enabl: OFF ? on

>

Example of normal limit switch (one setpoint for relay activation/deactivation): Selecting relay 1 to follow relative humidity, relay 2 to follow temperature, relay 3 to follow dewpoint, and relay 4 to follow dewpoint. One setpoint is chosen for all the outputs.

>rsel rh t td td

Rel1 RH above: 60.00 %RH ? 70

Rel1 RH below: 70.00 %RH ? -

Rel1 RH hyst : 2.00 %RH ? 2

Rel1 RH enabl: ON ? on

Rel2 T above: 50.00 'C ? 60

Rel2 T below: 40.00 'C ? -

Rel2 T hyst : 2.00 'C ? 2

Rel2 T enabl: ON ? on

Rel3 Td above: 5.00 'C ? 10

Rel3 Td below: 0.00 'C ? -

Rel3 Td hyst : 1.00 'C ? 1

Rel3 Td enabl: OFF ? on

Rel4 Td above: 0.00 'C ? 20

Rel4 Td below: 0.00 'C ? -

Rel4 Td hyst : 0.00 'C ? 2

Rel4 Td enabl: OFF ? on

>

134 __________________________________________________________________ M210704EN-H


Example of using relay 1 as fault alarm: selecting relay 1 to follow the fault status and relay 2 to follow the temperature measurement.

>rsel fault t

Rel1 FAUL above: -

Rel1 FAUL below: -

Rel1 FAUL hyst : -

Rel1 FAUL enabl: ON ?

Rel2 T above: 0.00 'C ? 30

Rel2 T below: 0.00 'C ? -

Rel2 T hyst : 0.00 'C ? 2

Rel2 T enabl: OFF ? ON

Testing the Operation of Relays

Note that testing activates relays even if they are disabled.

Use the module push buttons to activate the relays. Press the REL 1 or

REL 2 button to activate the corresponding relay.

Use the display/keypad to test the operation of relays.

1. Open the Main Menu by pressing any of the arrow buttons.

2. Select System, press the ►arrow button.

3. Select Diagnostics, press the ►arrow button.

4. Select Relay tests, press the ►arrow button.

5. Select Invert relay 1... , press TEST. Now the selected relay output is forced to opposite state. Press OK to return to normal operation.


RTEST

Use the serial line command RTEST to test the operation of the relays.

RTEST [ON/OFF ON/OFF]<cr>

Example: Testing all four relays.

>rtest on on on on

ON ON ON ON

>

>rtest off off off off

OFF OFF OFF OFF

Enter the command RTEST to stop testing.

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Sensor Functions

AutoCal

To obtain the best possible accuracy in measurements taken in dry environments, DMT340 has a built-in AutoCal. During the AutoCal,

DMT340 adjusts the dry-end reading to correspond to the calibrated values. Thishelps to avoid errors in accuracy when monitoring low dewpoints.

The AutoCal is carried out if the following criteria for the measurement environment are fulfilled:

- Relative humidity must be <2 % (DMT340 DRYCAP® M-sensor).

- Temperature must be 0<T<80 ºC (or sensor warming activated for

-40<T<80 ºC).

- Humidity environment must be stable. The maximum change in the dewpoint can be 2 ºC in 15 seconds.

NOTE AutoCal cannot operate if the above conditions are not fulfilled.

If the adjustment in the AutoCal reaches a preset maximum value or if the AutoCal correction fails, for example, because of unstable conditions, a new AutoCal will take place later (if the automatic AutoCal is turned on).

Automatic AutoCal

As a default, the automatic AutoCal in DMT340 is turned on. In this mode, the calibration takes place automatically if the dewpoint or temperature changes significantly, typically more than 10 ºC. However, if there are no changes in the conditions, the AutoCal will take place repeatedly after one hour from the last AutoCal. When measuring very dry conditions, the transmitter performs the AutoCal at shorter intervals.

A significant change in dewpoint or temperature may also trigger the

AutoCal.

136 __________________________________________________________________ M210704EN-H


Manual AutoCal

To check that AutoCal has taken place for obtaining the most accurate measurement in a very dry environment, you can perform AutoCal manually before measuring. To perform manual AutoCal:

1. Open the Main Menu by pressing any of the arrow buttons.

2. Select Measuring, press the ►arrow button.

3. Select AutoCal, press the ►arrow button.

4. Press START to start AutoCal. If the AutoCal conditions are not fulfilled, a note appears on the display informing that the calibration cannot be made.

0706-014

Figure 73 Following AutoCal on the Display


You can also perfom AutoCal manually by using the pressure set and

check buttons on the motherboard (see Figure 67 on page 107). Press

both buttons simultaneously to perform AutoCal.

Sensor Purge

Sensor Purge is a feature available for the DMT340 DRYCAP®

M-sensor. The purge should be carried out to achieve the shortest response times and the best long-term stability.

Sensor Purge is an automatic procedure, in which the sensor is dried.

Thus, the sensor will respond very fast when installing the probe from an ambient to a dry gas. This will also ensure, together with AutoCal, the best measurement accuracy and long-term stability.

As a default, the interval Purge and power-up Purge are turned on automatically in DMT340. It is recommended not to turn them off. The sensor Purge can also be started manually. If enabled, power-up Purge will start always about 10 seconds after reset. If the power is continuously turned on in DMT340, the automatic sensor Purge will be performed at an interval of 24 hours.

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A Sensor Purge should be performed always before calibration (see the calibration instructions) or when there is a reason to believe that the sensor has become exposed to an interfering chemical.

Starting and Configuring Sensor Purge

Using Display/Keypad (Optional)

1. Open the Main Menu by pressing any of the ▼▲◄► arrow buttons.

2. Select ►Measuring, press ►button

.

3. Select ►Purge, press ► button.

1103-067

Figure 74 Sensor Purge Settings

- Start the sensor purge manually by selecting Start Purge now and pressing START.

- Select Purge on power-up by using the arrow buttons. Press

On/Off to turn the start-up purge on/off.

- To set the automatic purge interval, select Interval: ... and press SET. Set the purge interval and the unit (minutes/hours) by using the arrow buttons. The interval must be 10 min … 48 h.

Press OK to confirm.

- If you have the data logger module installed, you can also specify the Date and Time when the Purge is performed next.


1103-066

Figure 75 Performing Sensor Purge

138 __________________________________________________________________ M210704EN-H



PURGE

Use the PURGE command to start the sensor purge immediately.

PURGE<cr>

Example:

>purge

Purge started, press any key to abort.

>

The prompt ' > ' appears when the heating period is over. However, the transmitter outputs are locked to the values measured before performing sensor purge until the settling time is over.

PUR

With the PUR command, you can enable or disable automatic and power-up sensor purge and set the interval for automatic purge. The default purge interval is 24 hours. If the sensor is exposed to chemicals it is recommended to have the sensor purge done at least once every 720 minutes (=12 hours). In applications where chemical exposure is not likely, the interval can be longer.

PUR<cr>

If the transmitter has a data logger module installed, you can also set the starting date and time for the interval purge. After the set time has been reached, the interval purge will be performed at the set interval. This functionality can be used to make sure the sensor purge starts at a specific time of the day.

Do not change the settings for duration, settling, temperature, temperature difference, or purge triggering unless instructed by Vaisala personnel.

Type PUR and press ENTER to proceed. Skip unchanged values by pressing ENTER. Input changed values in the format shown by the current value (for example, date and time). The maximum interval is

14400 minutes (=10 days).

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NOTE

NOTE

Example (no data logger module installed):

>pur

Interval Purge : ON ?

Interval : 1440 min ?

Power-up Purge : ON ?

Duration : 120 s ?

Settling : 240 s ?

Temperature : 160 'C ?

Temp. diff. : 0.5 'C ?

Trigger Purge : OFF ?

RH trigger : 20 %RH ?

>

Example (with data logger module installed):

>pur

Interval Purge : ON ?

Interval : 1440 min ?

Next Purge date: 2011-03-31 ?

Next Purge time: 12:00:00 ?

Power-up Purge : ON ?

Duration : 120 s ?

Settling : 240 s ?

Temperature : 160 'C ?

Temp. diff. : 0.5 'C ?

Trigger Purge : OFF ?

RH trigger : 20 %RH ?

>

To activate the new interval settings immediately, reset the transmitter.

When sensor purge in power-up is enabled, wait about 6 minutes after power up before taking measurements. The output channels are locked for the first operation minutes to the initial measured values

Sensor Warming

DMT340 contains a sensor warming function, that is, when humidity reaches a set limit (default: 70%RH), sensor warming operation is activated automatically. Sensor warming continues as long as the humidity is above that limit.

When the warming starts, the sensor operation indicator is displayed on the optional display and relays configured as "online status" (if any) will be released. Warming does not affect T quantities, all others will be frozen. d/f

,T d/f atm,

T d

,T d atm, x, H2O and Pw

140 __________________________________________________________________ M210704EN-H

Chapter 5 ___________________________________________________________________ Modbus

CHAPTER 5

MODBUS

This chapter contains information that is needed when operating the transmitter using the Modbus protocol.

Overview of Modbus Protocol Support

The DMT340 transmitter can be accessed using the Modbus serial communication protocol. Support for Modbus protocol is available on all

DMT340 transmitters as a standard feature from software version 5.10 onward. The supported Modbus variants and the connections they use are

listed in Table 31 below.

Table 31 Supported Modbus Variants

Supported Modbus Variant

Modbus RTU (Serial Modbus)

Modbus TCP (Ethernet Modbus)

Connections

RS-232 (standard User Port)

RS-422/485 interface (optional module)

LAN interface (optional module)

WLAN interface (optional module)

The supported Modbus functions, registers, configuration options, and

diagnostics are described in Appendix B, Modbus Reference, on page

183.

Note the following limitations of the Modbus implementation:

- Modbus TCP mode accepts only one TCP connection at a time.

Design the system so that only one Modbus TCP client accesses the transmitter.

- Modbus TCP can process reliably only one Modbus transaction at a time. Reduce the polling rate of the client to avoid nested transactions.

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Taking Modbus into Use

To take the Modbus protocol into use on the DMT340, you must perform certain configuration tasks using the built-in display and keypad

(optional) or a PC connected to the serial line. For example, you can connect to the Service Port using the USB service cable (Vaisala order code: 219685). The transmitter must be powered from a suitable power supply during configuration.

Instructions for performing the configuration are provided in the following sections:

- Enabling Serial Modbus on page 143

- Enabling Ethernet Modbus on page 144

After configuring the transmitter, perform the transmitter installation and

wiring according to the instructions in Chapter 3, Installation, on page

23.

The configuration instructions assume you are familiar with the use of the transmitter. Additional details on the display/keypad, Service Port use, and serial commands are available in other sections of this manual:

- The use of the display/keypad option is described in section Using

Display/Keypad on page 87.

- If this is the first time you are using the USB service cable, you can

find detailed instructions in section Service Port Connection on page

84. You must install the required driver before using the service cable.

- Configuration of the LAN and WLAN interfaces is decribed in section

LAN Communication on page 85.

- The serial commands available through the Service Port are described

beginning from section List of Serial Commands on page 96.

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Chapter 5 ___________________________________________________________________ Modbus

Enabling Serial Modbus

In addition to enabling the Modbus protocol in the device, Modbus over

RS-232 or RS-485 needs the following software settings: serial bit rate, parity, number of stop bits, and Modbus device address.



2. Navigate to Interfaces ► Serial Interface.

3. On the Serial Interface settings screen:

- Enable the Modbus protocol.

- Change the baud rate and parity if necessary.

- Set the Modbus device address.

1101-033

Figure 76 Serial Interface Settings

4. After changing the settings, press the EXIT button. The Modbus configuration is now complete, as configuration changes made with the display and keypad are effective immediately.


1. Open the transmitter cover.

2. Connect power supply wiring (if not using the power supply module) and power up the transmitter.

3. Connect the USB service cable between a computer and the Service

Port of the transmitter.

4. Start the Vaisala USB Instrument Finder program (which has been installed on the computer along with the USB service cable driver), and check the COM port that the cable is using.

5. Open a terminal program and connect to the Service Port. The fixed serial line settings of the Service Port are 19200, 8, 1, N.

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NOTE

6. Use the SMODE command to enable the Modbus mode:

> smode modbus

Serial mode : MODBUS

>

7. If necessary, use the SERI command to check and/or change the serial interface settings for the User Port. For example, to set the

User Port serial settings to 19200 N 8 1, issue the following command:

> seri 19200 N 8 1

The number of data bits must always be 8 for Modbus RTU.

The serial Modbus interface of the DMT340 does not work with baud rates 115, 150, and 300 b/s.

8. Use the ADDR command to set the Modbus address of the transmitter. For example, to set the Modbus address to 52, issue the following command:

>addr 52

You must set a non-zero address or Modbus RTU will not work.

9. The Modbus configuration is now complete. Reset or power cycle the transmitter to enable the Modbus mode, and proceed with the installation of the transmitter and the wiring of the serial interface.

Enabling Ethernet Modbus

In addition to enabling the Modbus protocol in the device, Modbus TCP needs the following software settings: IP address, subnet mask, and default gateway address. Also network name (SSID) and security settings must be configured if wireless network is used.



2. Navigate to Interfaces ► Network Settings ► IP Configuration.

3. On the IP Configuration screen, set the network configuration settings, and exit to save the changes.

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Chapter 5 ___________________________________________________________________ Modbus

1101-034

Figure 77 IP Configuration

4. Navigate back to the Network Settings menu. If you are using the

WLAN interface, select Wireless LAN Settings.

5. On the Wireless LAN Settings screen, set the network name

(SSID) and security options, and exit to save the changes.

1101-036

Figure 78 Wireless LAN Settings

6. Navigate back to the Network Settings menu. Select

Communication Protocol.

7. On the Communication Protocol screen, enable the Modbus protocol. Press the EXIT button to save the changes.

Note that the device address setting is not relevant for Modbus

TCP. In the Modbus mode, the transmitter will respond to all valid

Modbus messages with any “unit identifier” value.

1101-034

Figure 79 Communication Protocol

8. The Modbus configuration is now complete, as configuration changes made with the display and keypad are effective immediately.

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NOTE


1. Open the transmitter cover.

2. Connect power supply wiring (if not using the power supply module) and power up the transmitter.

3. Connect the USB service cable between a computer and the Service

Port of the transmitter.

4. Start the Vaisala USB Instrument Finder program (which has been installed on the computer along with the USB service cable driver), and check the COM port that the cable is using.

5. Open a terminal program and connect to the Service Port. The fixed serial line settings of the Service Port are 19200, 8, 1, N.

6. Use the SMODE command to enable the Modbus mode:

>smode modbus serial mode : MODBUS

>

7. Configure the networking parameters of the interface you are using:

After transmitter startup, it may take a few minutes for the network interface to become available for configuration. a. Use the NET command to configure the networking parameters of both LAN and WLAN interface. You can, for example, enter the command without parameters and enter the settings as prompted:

>net

DHCP : ON ? OFF

IP address : 0.0.0.0 ? 143.154.142.102

Subnet mask : 0.0.0.0 ? 255.255.0.0

Default gateway: 0.0.0.0 ?

Web config. : ON ? OFF


OK

> b. If you are using the WLAN interface, use the WLAN command to configure the network name (SSID) and security settings. For example:

>wlan

Network SSID : NAME ? NETWORKID

Type : OPEN ? WPA-PSK/TKIP

WPA-PSK phrase ? thequickbrownfox


OK

>

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Chapter 5 ___________________________________________________________________ Modbus

For a description of the available settings, see section

Wireless LAN Configuration on page 89.

8. The Modbus configuration is now complete. Reset or power cycle the transmitter to enable the Modbus mode, and proceed with the installation of the transmitter.

Diagnostic Modbus Counters

DMT340 has diagnostic counters that can be used to pinpoint Modbus problems. The counters are always active when the Modbus protocol is enabled.

Viewing Counters Using Display/Keypad

You can use the display/keypad option to view and clear the counters.

Enter the Main Menu and navigate to System ► Diagnostics

► MODBUS Counters.

1101-037

Figure 80 Modbus Counters

Viewing Counters Using Service Port

Use the MODBUS command to view the counters:

MODBUS<cr>

Example:

>modbus

Bus messages : 0

Bus comm. error: 0

Bus exceptions : 0

Slave messages : 0

Slave no resp. : 0

Last message :

>

In addition to the diagnostic counters, the last message (received or transmitted) is shown in hexadecimal format. If the last message was a broadcast message, the suppressed response message is shown.

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The last message displayed may be incomplete if there is active Modbus traffic while using the MODBUS command.

Modbus RTU only: If the last received message was rejected because of bad CRC checksum, the MODBUS command displays the message with corrected CRC (last two bytes updated).

To clear the counters, select again the Modbus mode with the SMODE command:

>smode modbus

Disabling Modbus

If you stop using Modbus with the transmitter, set the transmitter to some other operating mode using the display/keypad option or the SMODE command.

For example, to return the transmitter to the RUN mode where the measurements are output at regular intervals, issue the following command through the Service Port:

>smode run

Alternatively, you can enter the Main Menu using the display/keypad option, and change the mode from the Interfaces submenu.

The other communication settings of the output interface (User Port,

LAN interface, or WLAN interface) will remain as configured, but the

Modbus protocol will be disabled.

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Chapter 6 _______________________________________________________________ Maintenance

CHAPTER 6

MAINTENANCE

Periodic Maintenance

Cleaning

Clean the transmitter enclosure with a soft, lint-free cloth moistened with mild detergent.

Changing the Probe Filter

NOTE Some probe and filter combinations are equipped with a washer under the filter. The purpose of the washer is to prevent vibration from loosening the filter. If the washer is present, leave it in place when changing the filter.

1. Turn the filter counter-clockwise to loosen it.

2. Remove the filter from the probe. Be careful not to touch the sensor with the filter. Without the filter in place, the sensor is easily damaged – handle the probe carefully.

3. Install a new filter on the probe. When using the stainless steel filter, take care to tighten the filter properly (recommended force 5 Nm).

New filters can be ordered from Vaisala, see Spare Parts and Accessories on page 171.

Calibration and Adjustment

See Chapter 7, Calibration and Adjustment, on page 153.

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Error States

In error state the affected quantities are not measured and the output is shown as follows:

- Analog channel outputs 0 mA or 0 V (you can use the serial line command AERR or display/keypad to change this fault indication

value, see section Analog Output Fault Indication Setting on page

127).

- Serial port outputs stars "***" instead of measurement data.

- Display shows "----" instead of measurement data.

- Cover LED is blinking.

- Error indicator is shown on the display.

0706-017, 1103-069

Figure 81 Error Indicator and Error Message


1 = Error indicator

The error indicator disappears when the error state is over and you have checked the error message. Press the INFO button to display the error message.

You can also check the error message via the serial interface by using the command ERRS. In case of constant error, please contact Vaisala

Technical Support. See section Technical Support on page 152.

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Chapter 6 _______________________________________________________________ Maintenance

Table 32 Error Messages

Error Code Error Message

E0 Humidity sensor measurement malfunction.

E1

E2

E3

E4

E5

E6

E7

Humidity sensor short circuit

Humidity sensor open circuit

Temperature sensor open circuit.

Temperature sensor short circuit.

Temperature measurement malfunction

Temperature sensor current leak.

Internal ADC read error

Action

Check the integrity of the humidity probe and the probe cable. Clean the probe from dirt, water, ice or other contaminants.

Check the integrity of the humidity probe and the probe cable.

Check the integrity of the humidity probe and the probe cable. Clean the probe from dirt water, ice or other contaminants.

Internal transmitter failure. Remove the transmitter and return the faulty unit to Vaisala

Service.


Service.

E9

E10

Checksum error in the internal configuration memory

Internal EEPROM read

E11 error

Internal EEPROM write error

E12 … E13 Add-on module 1 (or 2)

E14

E15

E18 connection failure

Device internal temperature out of range

Internal RAM memory or software checksum error

Internal ADC reference voltage out of range

Internal analog output E19 reference voltage out of range

E20 … E22 Configuration switches for analog output 1/2/3 set incorrectly

E24 … E25 Internal error in add-on

E26 module 1 (or 2)

Communication module installed in incorrect addon module slot

E28 … E29 Unknown/incompatible module installed in add-on

E30 module slot 1 (or 2)

Internal analog voltage out of range

E31

Turn off the power and check the module connection. Turn on the power.

Ensure that the operating temperature is within the valid range.


Service.

Check and re-set the switches, see page 57.

Disconnect the power and check the module connection.

Disconnect the power and change the communication module to another module slot.

Ensure that the module is compatible with the

DMT340.


Service.

Check that the supply voltage is correct and the power supply can provide enough power for the instrument.

Internal system voltage out of range

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Technical Support

For technical questions, contact Vaisala Technical Support by e-mail at [email protected]

. Provide at least the following supporting information:

- Name and model of the product in question.

- Serial number of the product.

- Name and location of the installation site.

- Name and contact information of a technical person who can provide further information on the problem.

For contact information of Vaisala Service Centers, see www.vaisala.com/servicecenters .

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Chapter 7 ___________________________________________________ Calibration and Adjustment

CHAPTER 7

CALIBRATION AND ADJUSTMENT

Calibration

DMT340 is fully calibrated and adjusted as shipped from the factory. The typical calibration interval is two years. Calibration must always be done when there is reason to believe that the device is not within the accuracy specifications.

It is recommended that the device is sent to a Vaisala Service Center for calibration and adjustment. For contact information of Vaisala Service

Centers, see www.vaisala.com/servicecenters .

Vaisala hand-held dewpoint meter DM70 can also be used to calibrate the transmitter.

User Calibration and Adjustment

When adjusting DMT340, the reading is changed to correspond to the reference value. After the adjustment, the original calibration certificate shipped with the product is no longer valid.

NOTE Dewpoint calibration should be carried out by Vaisala or in laboratory conditions by a person with appropriate expertise.

The reference condition of the dewpoint must be traceable to the appropriate standards. The user adjustment requires a stable humidity generator capable of producing the required humidities and a calibrated reference dewpoint meter. For adjustment, the probe and the reference dewpoint meter are connected to the humidity generator output, the reference condition is adjusted and let to stabilize. After the probe and the reference dewpoint meter are stabilized, the DMT340 reading is adjusted to correspond the reference value.

When adjustinga DMT340 transmitter equipped with DRYCAP ® 180Msensor, the reference low dewpoint temperature must be between -57 °C and -67 °C (-70.6 °F ... -88.6 °F) in gas temperature of approx. +20 °C.

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To ensure the correctness of the adjustment, the reference dewpoint meter must be calibrated at a recognized laboratory with a known uncertainty and traceability to national or international standards.

To see when the adjustment was last made, select Adjustment

information (with keypad INFO button in the main view, or with serial commands ? and CDATE) or check the date from the Device

information view. See section Device Information on page 111.

Opening and Closing the Adjustment

Mode

Open the transmitter cover. The buttons needed in the adjustment are on

the left-hand side of the motherboard (see Figure 2 on page 21).

Press the ADJ button to enable the adjustment mode. The indicator LED indicates the adjustment availability.

Table 33 Indicator Led Functions

Indicator Led Function

LED off

LED on

LED blinking evenly

LED blinking with short pulses

Description adjustment locked adjustment available measurement not stabilized performing Purge/AutoCal

Press the ADJ key again to disable the adjustment mode.

NOTE Fixed pressure compensation of 1013.25 hPa is used when in adjustment mode. Adjustments should be performed at ambient pressures.

154 __________________________________________________________________ M210704EN-H


Adjustment Information

Adjustment information is shown on the device information screens; see

section Device Information on page 111. Use the display/keypad to enter

the adjustment information.

1. If you are not in the adjustment menu, press the ADJ button on the motherboard to open the ADJUSTMENT MENU.

2. Press the ► arrow button to select Adjustment info.

3. Select Date, press SET. Enter the date by using the arrow buttons.

Press OK.

4. Select i, press CHANGE. Enter the information text (max. 17 characters) by using the arrow buttons. Press OK.


CTEXT and CDATE

Use the serial line command CTEXT to enter text to the adjustment information field. First press the adjustment button on the motherboard inside the transmitter.

Example:

>ctext

Adjust. info : (not set) ? -60ºC IKØ

>

Use the CDATE command to input date to the adjustment information field. Set the adjustment date in format YYYY-MM-DD.

Example:

>cdate

Adjust. date : (not set) ? 2004-05-21

>

Press the adjustment button on the motherboard inside the transmitter to disable the adjustment function.

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Adjusting Dewpoint T

d/f

Before adjusting dewpoint, first carry out the two-point relative humidity adjustment, which will ensure the basic adjustment level. After that, continue with the actual T d/f adjustment.

Two-Point Relative Humidity Adjustment using Display/Keypad

For DMT340 M-sensor, the humidity references of 0 % (for example nitrogen) and 10 ... 20 % are required.

NOTE For the DMT340 M-sensor both reference humidities must be below

20 %RH.

To make the adjustment, follow the instructions below. Use preferably the display keypad and let the display information guide you through the two-point RH adjustment process.

1. Press the Adjustment button ADJ on the motherboard inside the transmitter to enable adjustments.

2. Select Adjust Td measurement, press the ►arrow button.

3. Select 2-point RH adjustment, press Start. Press OK to perform purge of point 1.

Figure 82 Starting the Adjustment

0706-018

Figure 83 Performing Purge

0706-019

156 __________________________________________________________________ M210704EN-H


4. Press GRAPH to follow the RH and T stabilization on graphical display:

0706-020

Figure 84 Following the RH Trend on Graphical Display

5. Follow the instructions on the display. Use the arrow buttons to enter the actual humidity of the reference used.

0706-021

Figure 85 Ending Adjustment of Point 1

6. Continue adjustment of point 2 as instructed by the display:

0706-022

Figure 86 Proceeding to Adjustment of Point 2

7. Follow the purge progress and wait for stabilization of Point 2 as in

Figure 83 on page 156. Press READY when stabilized.

8. Use the arrow buttons to enter the actual humidity of the reference used. Follow the instructions on the display to complete the RH adjustment.

Figure 87 Completing Adjustment of Point 2

0706-023

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Two-Point Relative Humidity Adjustment using Serial Line

Perform purge before adjustment. Use the PURGE command. See

section PURGE on page 139.

After the purge is complete, press the adjustment button on the motherboard inside the transmitter to enable adjustments.

Perform the adjustment with the FCRH command. Wait at least 1 hour before adjusting each point.

FCRH<cr>

Example:

>fcrh

RH : 3.90 Ref1 ? 0

Press any key when ready ...

RH : 3.90 Ref2 ? 15

OK

>

One-Point Dewpoint Adjustment using

Display/Keypad

Before proceeding with the T d/f

adjustment you must perform the RH adjustment. For DMT340 DRYCAP® M-sensor, the reference temperature of the dewpoint should be -57 ˚C ... -67 ˚C

(-70.6 ˚F ... -88.6 ˚F).

Use preferably the display/keypad to perform one-point dewpoint T d/f adjustment. To adjust the dewpoint, follow the instructions below:

1. Press the ADJ button on the motherboard to open the

ADJUSTMENT MENU.

2. Press the ► arrow button to select Adjust T d

measurement.

3. Select by pressing 1-point T d/f adjusting.

adjustment. Press START to start

4. Leave the sensor to stabilize for at least 5 hours. Follow the instructions on the display.

158 __________________________________________________________________ M210704EN-H


0706-024

Figure 88 Following Stabilization

5. Purge will be performed next. Follow the purge progress on the display.

6. Let the sensor stabilize for at least 1 hour after the purge before proceeding with the adjustment. Press READY when stabilized.

0706-025

Figure 89 Proceeding with T d/f

Adjustment

7. Enter the actual reference frostpoint temperature.

8. The transmitter performs T d/f minute.

adjustment. This may take up to one

NOTE

0706-026

Figure 90 Completing T d/f

Adjustment

9. After adjustment wait for the sensor to cool down ( this will take 2 minutes at maximum). The adjustment is now completed.

Several AutoCals can be necessary after this adjustment has been performed until the transmitter reaches full accuracy.

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NOTE

One-Point Dewpoint Adjustment using

Serial Line

1. Let the sensor stabilize for at least 5 hours.

2. Use the PURGE command to start the manual purge. See section

PURGE on page 139.

3. Wait at least 1 hour. Then press the adjustment button on the motherboard inside the transmitter to enable adjustments.

4. Use the IKØ command to perform the adjustment.

IKØ<cr>

Example:

>ik0

Tf : -19.74 'C Ref ? -60

Wait for AutoCal data...OK

>

5. Press the adjustment button on the motherboard inside the transmitter to disable adjustments.

Several AutoCals can be necessary after this adjustment has been performed until the transmitter reaches full accuracy.

160 __________________________________________________________________ M210704EN-H


Adjusting Temperature

Adjusting Temperature using

Display/Keypad

Use preferably the display/keypad to adjust the temperature.

1. Press the ADJ button on the motherboard to open the

ADJUSTMENT MENU.

2. Press the ► arrow button to select Adjust T measurement.

3. Select by pressing 1-point or 2-point adjustment. Press START to start adjusting.

4. Remove the filter from the probe and insert the probe into a reference temperature.

5. Wait at least 30 minutes for the sensor to stabilize. Follow the stabilization from the GRAPH display.

6. Press READY when stabilized. Enter the reference temperature using the arrow buttons.

When carrying out the 2-point adjustment proceed to the next adjustment point and carry out the procedure for the second reference point as described in the previous steps. Note that the difference between the two temperature references must be at least

30 ºC.

7. Press OK. Press YES to confirm the adjustment.

8. Press OK to return to the adjustment menu.


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Adjusting Temperature using Serial Line

CT

Use the serial line command CT to adjust the temperature.

1. Press the ADJ button on the motherboard to open the adjustment mode.

2. Remove the probe filter and insert the probe into the reference temperature.

3. Use the CT command and press ENTER. Type C and press

ENTER to check if the reading is stabilized.

4. Let the reading stabilize, enter the reference temperature after the question mark and press ENTER three times (when performing a

1-point calibration).

If you are using a second reference temperature (when performing a 2-point calibration) press ENTER twice and insert the probe to the second reference. When the reading is stabilized, enter the second reference temperature after the question mark and press

ENTER. Note that the difference between the two temperature references must be at least 30 ºC.

Example (one-point adjustment):

>ct

T : 16.06 Ref1 ? c

T : 16.06 Ref1 ? c

T : 16.06 Ref1 ? c

T : 16.06 Ref1 ? c

T : 16.06 Ref1 ? c

T : 16.06 Ref1 ? 16.0

Press any key when ready ...

T : 16.06 Ref2 ?

OK

>

OK indicates that the calibration has succeeded.

5. Press the ADJ button on the motherboard to close the adjustment mode.

6. Take the probe out of the reference conditions and replace the filter.

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Adjusting Analog Outputs

In the analog output calibration the analog output is forced to the following values: current output = 2 mA and 18 mA voltage output = 10 % and 90 % of the range

Connect DMT340 to a calibrated current/voltage meter in order to measure either current or voltage depending on the selected output type.

Use the display/keypad or the serial line to do this.

Adjusting Analog Outputs using

Display/Keypad

1. Press the ADJ button on the motherboard to open the

ADJUSTMENT MENU.

2. Press the ► arrow button to select Adjust analog outputs.

3. Select the output to be adjusted from the Adjust analog output

1/2/3 options and press START.

4. Measure the first analog output value with a multimeter. Enter the measured value by using the arrow buttons. Press OK.

5. Measure the second analog output value with a multimeter. Enter the measured value by using the arrow buttons. Press OK.

6. Press OK to return to the adjustment menu.

7. Press EXIT to close the adjustment and to return to the basic display.

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Adjusting Analog Outputs using Serial

Line

ACAL

To perform the analog output adjustment using the serial line, use the

ACAL command and enter the multimeter readings when prompted.

1. Press the ADJ button on the motherboard to enable adjustments.

2. Use the ACAL command to start the adjustment sequence.

ACAL<cr>

3. Measure the first analog output value with a multimeter, and enter the measured value.

4. Continue measuring and entering the values until the sequence is complete.

Example (current outputs):>ACAL

Ch1

Ch1

Ch2

Ch2

>

I1 (mA) ? 2.046

I2 (mA) ? 18.087

I1 (mA) ? 2.036

I2 (mA) ? 18.071

5. Press the ADJ button on the motherboard inside the transmitter again to disable the adjustment function.

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Chapter 8 _____________________________________________________________ Technical Data

CHAPTER 8

TECHNICAL DATA

Specifications

Performance

Measured variables

Dewpoint

Sensor

Measurement range

For continuous use

Accuracy up to 20 bar / 290 psia

20 ... 50 bar / 290 ... 725 psia

Vaisala DRYCAP®180M

-70 ... +80 °C (-94 ... +176 °F) Td

-70 ... +45 °C (-94 ... +113 °F) Td

±2 °C / ±3.6 °F

(see the accuracy graph below) additional inaccuracy +1 °C Td

0503-039

Figure 91 Dewpoint Accuracy vs. Measurement Conditions

Response time 63% [90%] at +20°C gas temperature

Flow rate 1 l/min and 1 bar pressure

-60 … -20 °C Td (-76 … -4 °F Td)

-20 … -60 °C Td (-4 … -76 °F Td)

5s [10s]

45s [10min]

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Temperature

Measurement range

Accuracy

Temperature sensor

0 ... +80 °C (+32 ... +176 °F)

±0.2 °C at room temperature

Pt100 RTD Class F0.1

IEC 60751

Relative humidity

Measurement range

Accuracy (RH <10 %RH, at +20 °C) ppmv (dry)

Measurement range (typical)

Accuracy (at + 20 °C, 1 bar)

0 ... 70 %RH

±0.004 %RH + 20% of reading

10 ... 2500 ppm

1 ppm + 20% of reading

Other measurement parameters available (depends on model): mixing ratio, absolute humidity, pressure dewpoint calculated to 1 bar, temperature difference (T-Td), water vapor pressure

Operating Environment

Mechanical durability for transmitter body with display

Storage temperature range without display with display

Pressure and temperature range for probes

Measured gases

Electromagnetic compatibility up to +180 °C (+356 °F)

-40 ... +60 °C (-40 ... +140 °F)

0 ... +60 °C (+32 ... +140 °F)

-55 … +80 °C (-67 … +176 °F)

-40 … +80 °C (-40 … +176 °F) see probe specifications non corrosive gases

Complies with EMC standard

EN61326-1, Industrial environment

Note: Transmitter with display test impedance of 40 ohm is used in IEC61000-4-5

(Surge immunity).

Inputs and Outputs

Operating voltage with optional power supply module

10 ... 35 VDC, 24 VAC

100 ... 240 VAC 50/60 Hz

Default start-up time after sensor Purge and Autocal About 6 min

Start-up time after power-up 3 s

Power consumption at 20 °C (U in

24VDC)

I

RS-232

U out out

2 x 0 ... 1V / 0 ... 5V / 0 ... 10V

2 x 0 ... 20 mA display and backlight during sensor purge

Analog outputs (2 standard, 3rd optional) current output voltage output

Accuracy of analog outputs at 20 °C

Temperature dependence of the analog outputs max 25 mA max 25 mA max 60 mA

+ 20 mA max + 110 mA

0 ... 20 mA, 4 ... 20 mA

0 ... 1 V, 0 ... 5 V, 0 ... 10 V

± 0.05 % full scale

± 0.005 %/°C full scale

166 __________________________________________________________________ M210704EN-H


External loads current ouputs

0 ... 1 V output

Wire size

0 ... 5 V and 0 ... 10 V outputs

Digital outputs

Protocols

Relay outputs (optional)

Display (optional)

Menu languages

R

R

L

L

< 500 ohm

> 2 kohm

RL > 10 kohm

0.5 ... 2.5 mm 2 (AWG 20 ... 14) stranded wires recommended

RS-232

RS-422/485 (optional)

LAN (optional)

WLAN (optional)

ASCII commands

Modbus RTU

Modbus TCP

0.5 A, 250 VAC, SPDT

LCD with backlight, graphic trend display

Chinese, English, Finnish,

French, German, Japanese,

Russian, Spanish, Swedish

Mechanics

Cable bushing

Conduit fitting

User cable connector (optional) option 1 option 2

Probe cable diameter

Probe tube material

Housing material

Housing classification

Without display

With display and keypad

Standard Probe Cable Lengths and Approximate

Transmitter Weight (in kg/lb)

M20x1.5 for cable diameter

8 ... 11mm/0.31 ... 0.43"

1/2" NPT

M12 series 8-pin (male) with plug (female) with 5 m /

16.4 ft black cable with plug (female) with screw terminals

5.5 mm

AISI 316L

G-AlSi 10 Mg (DIN 1725)

Transmitter weight (with probe, cable, and modules) 1.0 ... 3.0 kg (2.2 ... 6.6 lb)

Table 34

IP 66 (NEMA 4X)

IP 65 (NEMA 4X)

Probe Type

DMT342

DMT344

DMT337

DMT348

Probe Cable Length

2 m

1.1/2.4

1.4/3.1

1.2/2.6

1.4/3.1

5 m

1.2/2.6

1.6/3.5

1.3/2.9

1.6/3.5

10 m

1.5/3.3

1.9/4.2

1.5/3.3

1.9/4.2

-

-

15 m

-

2.2/4.9

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Probe Specifications

Operating temperatures for probes*

Pressure ranges for probes

DMT342

DMT344

DMT347

DMT348 with Ball Valve

* Mechanical durability

-40 ... +80 °C (-40…+176 °F)

0 … 50 bar / 0 ... 725 psia

0 … 50 bar / 0 ... 725 psia

0 … 10 bar / 0 ... 145 psia

0 … 40 bar / 0 ... 580 psia

0 … 20 bar / 290 psia up to +180 °C (+356 °F)

Technical Specifications of Optional

Modules

Power Supply Module

Operating voltage

Connections

Bushing

Operating temperature

Storage temperature

100 ... 240 VAC 50/60 Hz screw terminals for

0.5 ... 2.5 mm 2 wire

(AWG 20 ... 14) for 8 ... 11 mm diameter cable

-40 ... +60 °C (-40 ... +140 °F)

-40 ... +70°C (-40 ... +158 °F)

E249387 UL file number

Analog Output Module

Outputs

Operating temperature range

Power consumption

I

U out

U out out

External loads

0 ... 1 V

0 ... 5V/0 ... 10V

0 ... 20 mA current outputs

Max load + cable loop resistance

0 ... .1 V

0 ... 5 V and 0 ... 10 V

Storage temperature range

3-pole screw terminal max wire size

0 ... 20 mA, 4 ... 20 mA,

0 ... 1 V, 0 ... 5 V, 0 ... 10 V

-40 ... +60 °C (-40 ... +140 ºF) max 30 mA max 30 mA max 60 mA

R

L

< 500 ohms

540 ohms

R

L

> 2000 ohms R

L

> 10 000 ohms

-55 ... +80 °C (-67 ... +176 ºF)

1.5 mm 2 (AWG16)

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Relay Module


Operating pressure range

Power consumption at 24 V

Contacts SPDT (change over), for example,

Contact arrangement Form C

Imax

Imax

Safety standard for the relay component


3-pole screw terminal / relay max wire size

RS-485 Module


Operating modes

Operating speed max

Bus isolation

Power consumption at 24V

External loads standard loads


Max wire size

LAN Interface Module



Operating humidity range


Ethernet type

Connector

IPv4 address assignment

Protocols

Max number of Telnet/Modbus clients

WLAN Interface Module



Operating humidity range


Supported standards

Connector

IPv4 address assignment

Protocols

Max number of Telnet/Modbus clients

Security

-40 ... +60 ºC (-40 ... +140 ºF)

500 ... 1300 mmHg max 30 mA

0.5 A 250 VAC

0.5 A 30 VDC

IEC60950 UL1950

-55 ... +80 ºC (-67 ... +176 ºF)

2.5 mm 2 (AWG14)

-40 ... +60 ºC (-40 ... +140 ºF)

2-wire (1-pair) half duplex

4-wire (2-pair) full duplex

115.2 kbaud

300VDC max 50 mA

32 RL> 10kohm

-55 ... +80 ºC (-67 ... +176 ºF)

1.5 mm 2 (AWG16)

-40 ... +60 ºC (-40 ... +140 ºF)

-40 ... +85 ºC (-40 ... +185 ºF)

5 … 95 %RH max 60 mA

10BASE-T 100BASE-TX

8P8C (RJ45)

DHCP (automatic), static

Telnet, Modbus TCP

1

-20 ... +60 ºC (-4 ... +140 ºF)

-40 ... +85 ºC (-40 ... +185 ºF)

5 … 95 %RH max 80 mA

802.11b

RP-SMA

DHCP (automatic), static

Telnet, Modbus TCP

1

WEP 64/128, WPA2/802.11i

VAISALA _______________________________________________________________________ 169

User's Guide _______________________________________________________________________

Data Logger Module




Logged parameters

Logging interval

Maximum logging period

Logged points

Accuracy of the clock

Battery lifetime at -40 ... +30 ºC (-40 ... +86 ºF) at +30 ... +60 ºC (+86 ... +140 ºF)

-40 ... +60 ºC (-40 ... +140 ºF)

-55 ... +80 ºC (-67 ... +176 ºF) max 10 mA up to four with trend/min/max values for each

10 s (fixed)

4 years 5 months

13.7 million points / parameter better than ± 2 min/year

7 years

5 years

170 __________________________________________________________________ M210704EN-H


Spare Parts and Accessories

Information on spare parts, accessories, and calibration products is available online at www.vaisala.com

and store.vaisala.com

.

Table 35 Spare Parts and Accessories

Description

MODULES

Relay module

Analog Output Module

Isolated RS485 Module

Power Supply Module

Galvanic Isolation Module

FILTERS

Sintered Filter AISI 316L

Stainless Steel Filter

TRANSMITTER MOUNTING ACCESSORIES

Wall Mounting Kit

Installation Kit for Pole or Pipeline

Rain Shield with Installation Kit

DIN Rail Clips with Installation Plate

Panel Mounting frame

Order Code

RELAY-1

AOUT-1

RS485-1

POWER-1

DCDC-1

HM47280SP

HM47453SP

214829

215108

215109

215094

216038

PROBE MOUNTING ACCESSORIES

Sampling Cell with ISO1/2" Female Connectors DMT242SC

Sampling Cell with ISO1/2" Swagelok Connectors DMT242SC2

DM240FA Installation Flange ISO1/2

DMT342

Sampling Cell for Probe with Flange

5 pcs O-ring Set Size 14.1×1.6

HMP302SC

216026

DMT344

Fitting Body M22×1.5

Fitting Body NPT1/2

DMT347

Swagelok for 12mm Probe 3/8" ISO Thread

Swagelok for 12mm Probe 1/2" ISO Thread

Swagelok for 12mm Probe 1/2" NPT Thread

DMT348

Fitting Body ISO1/2 Solid Structure (without leak screw)

Fitting Body NPT1/2 Solid Structure (without leak screw)

Fitting Body Set ISO 1/2 (with leak screw)

Fitting Body Set (ISO 1/2 + NPT 1/2)

Ball Valve ISO1/2 with Welding Joint

Manual Press

Leaking Screw with Allen Key

Thread Adapter ISO1/2 to NPT1/2

Plug Kit (ISO 1/2)

17223SP

17225SP

SWG12ISO38

SWG12ISO12

SWG12NPT12

DRW212076SP

NPTFITBODASP

ISOFITBODASP

THREADSETASP

BALLVALVE-1

HM36854SP

216027

210662SP

218773

VAISALA _______________________________________________________________________ 171

User's Guide _______________________________________________________________________

Description

CONNECTION CABLES

Serial Interface Cable

USB-RJ45 Serial Interface Cable

MI70 Connection Cable with RJ45 Connector

OUTPUT CABLES FOR 8-PIN CONNECTOR

Order Code

19446ZZ

219685

211339

Connection Cable 5m 8-pin M12 Female, Black 212142

Female Connector 8-pin M12 with Screw Terminals 212416

Male Connector 8-pin M12 with Cable and Adapter 214806SP

CABLE BUSHINGS

Cable Gland M20×1.5 for 8 ... 11mm Cable

Cable Gland M20×1.5 for 11 ... 14mm Cable

Conduit Fitting M20×1.5 for NPT1/2 Conduit

Dummy Plug M20×1.5

WINDOWS SOFTWARE

MI70 Link software with USB Service Cable

MI70 Link software with RS232 Service Cable

OTHER

HMK15 Calibration Adapter for

12 mm Probes with >7 mm Sensor Pins

Enclosure spare kit: hexagonal cover screws (4x) and hinge with attachment screws

214728SP

214729

214780SP

214672SP

219916

215005

211302SP

238509

172 __________________________________________________________________ M210704EN-H


Dimensions (mm/inch)

53.5 (2.10) 38 (1.50) 38 (1.50)

183 (7.20)

169 (6.65)

53.5 (2.10)

Figure 92 DMT340 Transmitter Body Dimensions

0506-035

VAISALA _______________________________________________________________________ 173

User's Guide _______________________________________________________________________

183 (7.20)

Figure 93 WLAN Antenna Dimensions

0804-035

0506-034

Figure 94 Sampling Cell Dimensions

174 __________________________________________________________________ M210704EN-H


183 (7.20) 77 (3.0)

Figure 95 DMT341 Dimensions

1506-095

VAISALA _______________________________________________________________________ 175

User's Guide _______________________________________________________________________

Figure 96 DMT342 Probe Dimensions

0503-044


0804-059

176 __________________________________________________________________ M210704EN-H



0804-129

Figure 99 DMT348 Standard Probe Dimensions

0704-054

VAISALA _______________________________________________________________________ 177

User's Guide _______________________________________________________________________

Figure 100 NPT 1/2" Nut Dimensions

0704-056

Figure 101 DMT348 Optional 400mm Probe Dimensions

0704-055

178 __________________________________________________________________ M210704EN-H

Appendix A _______________________________________________________ Calculation Formulas

APPENDIX A

CALCULATION FORMULAS

This Appendix contains the formulas used for the calculated output quantities.

The DMT340 series transmitters measure relative humidity and temperature. From these values dewpoint, mixing ratio, absolute humidity and enthalpy in normal pressure are calculated using the following equations:

Dewpoint:

T d

= log



T n

 m

Pw

A

− 1

(1)

P w

is the water vapor pressure. The parameters A, m, and Tn depend on temperature according to the following table: t

<0 °C 1)

0 ... 50 °C

50 ... 100 °C

100 ... 150 °C

150 ... 180 °C

A

6.1134

6.1078

5.9987

5.8493

6.2301 m

9.7911

7.5000

7.3313

7.2756

7.3033

1) Used for frostpoint calculation if the dewpoint is negative

Mixing ratio: x = 621 .

99 × p

P

w

P w

Tn

273.47

237.3

229.1

225.0

230.0

(2)

VAISALA _______________________________________________________________________ 179

User's Guide _______________________________________________________________________

Absolute humidity: a = 216 .

68 ⋅

P

T w

(3)

Enthalpy: h = ( T − 273 .

15 ) ⋅ ( 1 .

01 + 0 .

00189 ⋅ x ) + 2 .

5 ⋅ x (4)

The water vapour saturation pressure P ws equations (5 and 6):

is calculated by using two

(5)

Θ =

T

−

i

3

∑

= o

C i

T i where:

T = temperature in K

Ci = coefficients

C0 = 0.4931358

C1 = -0.46094296 * 10-2

C2 = 0.13746454 * 10-4

C3 = -0.12743214 * 10-7

(6)

ln

P ws

=

i

3

=

∑

− 1 b i

Θ

i

+

b

4

ln Θ

where:

bi = coefficients

b-1 = -0.58002206 * 104

b0 = 0.13914993 * 101

b1 = -0.48640239 * 10-1

b2 = 0.41764768 * 10-4

b3 = -0.14452093 * 10-7

b4 = 6.5459673

180 __________________________________________________________________ M210704EN-H

Appendix A _______________________________________________________ Calculation Formulas

The water vapor pressure is calculated using:

P w

= RH ⋅

P ws

100

Parts per million by volume is calculated using: ppm v

= 10 6 ⋅

( p

P

− w

P w

)

Symbols:

Td = dewpoint temperature (°C)

Pw = water vapour pressure (hPa)

Pws = water vapour saturation pressure (Pa)

RH = relative humidity (%)

x = mixing ratio (g/kg)

p = atmospheric pressure (hPa)

a = absolute humidity (g/m3)

T = temperature (K)

h = enthalpy (kJ/kg)

(7)

(8)

VAISALA _______________________________________________________________________ 181

User's Guide _______________________________________________________________________


182 __________________________________________________________________ M210704EN-H

Appendix B _________________________________________________________ Modbus Reference

APPENDIX B

MODBUS REFERENCE

This appendix describes the Modbus functions and data of the transmitter.

Function Codes

DMT340 supports all Modbus conformance class 0 and class 1 function codes defined in Open Modbus/TCP Specification, Release 1.0.

Table 36 Supported Function Codes

Function Code

01 (0x01)

02 (0x02)

03 (0x03)

04 (0x04)

05 (0x05)

06 (0x06)

07 (0x07)

08 (0x08)

15 (0x0F)

16 (0x10)

22 (0x16)

23 (0x17)

43 / 14 (0x2B / 0x0E)

Name

Read Coils

Read Discrete Inputs

Read Holding Registers

Read Input Registers

Write Single Coil

Write Single Register

Read Exception Status

Diagnostics

Write Multiple Coils

Write Multiple Registers

Mask Write Register

Read/Write Multiple Registers

Read Device Identification

Notes

Class 1

Class 1

Class 0

Class 1

Class 1

Class 1

Class 1

Class 2

Class 0

Class 2

Class 2

Class 0 function codes are enough to access all measurement data and configuration settings of the DMT340 transmitter. In addition, all class 1 and some class 2 commands are also supported giving better compatibility and allowing more efficient communication when needed.

Modbus diagnostic and device identification data can be read out only with the function codes dedicated for those purposes (08 and 43 / 14).

VAISALA _______________________________________________________________________ 183

User's Guide _______________________________________________________________________

Register Map

All data available via the Modbus interface is grouped in six contiguous

blocks of registers as described in Table 37 below.

Table 37 DMT340 Modbus Register Blocks

Address

0001…0068

0257…0290

0513…0517

0769…0790

1025…1035

1281…1288

Data Format

32-bit IEEE float

16-bit signed integer

Bit field

32-bit IEEE float

16-bit signed integer

Bit field

Description

Measurement data (read-only)

Status registers (read-only)

Configuration settings

Configuration flags

The addresses are 1-based decimal Modbus data model addresses without the first digit (e.g. 0xxxx, 1xxxx, 3xxxx, or 4xxxx). Subtract 1 to get address field values used in Modbus Protocol Data Unit (PDU).

The register map is the same for all Modbus function codes. For example, function codes 03 and 04 return exactly same result, as do

01 and 02.

Function codes 01 and 02 return 0 if the corresponding register has value

0x0000 and 1 if the register is non-zero. Writing with function codes 05 or 15 effectively writes value 0x0000 or 0x0001 in the register(s).

Data Encoding

All numeric values are available both in 32-bit IEEE floating point and

16-bit signed integer formats.

32-Bit Floating Point Format

Floating point values are represented in standard IEEE 32-bit floating point format. Least-significant 16 bits of floating point numbers are placed at the smaller Modbus address as specified in Open Modbus TCP

Specification, Release 1.0. This is also known as “little-endian” or

“Modicon” word order.

NOTE Despite the specification, some Modbus masters may expect

“big-endian” word order (most-significant word first). In such case, you must select “word-swapped” floating point format in your Modbus master for DMT340 Modbus registers.

A “quiet NaN” value is returned for unavailable values. Writing any NaN or infinite value is silently ignored. A quiet NaN is, for example,

0x7FC00000; however, the master should understand any NaN value.

184 __________________________________________________________________ M210704EN-H


NOTE A complete 32-bit floating point value should be read and written in a single Modbus transaction (e.g. function codes 05, 06, and 22 do not have an effect on floating point values).

16-Bit Integer Format

16-bit integer values are scaled to include the necessary decimals

(see corresponding register table for the scaling factor). Negative values

(when applicable) are represented in 2’s complement (65535 = -1, 65534

= -2, etc.).

NOTE

NOTE

Measurement parameters with normally positive values (for example,

0 … 100 %RH) may occasionally return small negative values because of measurement inaccuracy. These negative values are returned as large 16bit integer values (2’s complement).

If the scaled value does not fit in the range 0…65535 (16-bit range), the value is “wrapped” to the range by adding or subtracting 65536 as many times as needed.

For example, mixing ratio (x) value 658.92 g/kg is returned in 16-bit integer format as 356 (0x0164). You will need to add suitable offset to the 16-bit data in the Modbus master to get valid value out:

356 (16-bit register value) + 65536 (offset) = 65892 --> 658.92 g/kg

(scaled by ×0.01).

However, most of the measurement data values do not need any offset.

A zero 16-bit value is returned for unavailable values. There is no way to distinguish missing values from actual zero values if the zero value is included in the valid measurement range of the parameter.

If your Modbus master supports 32-bit floating point values, always use them instead of 16-bit integer registers.

The use of 16-bit integer values is not recommended in critical applications because you cannot distinguish true zero values from zero values generated by measurement failures.

In addition to this, 2’s complement makes negative values look like large positive values, which must be taken into account when utilizing the

16-bit register values.

When writing 16-bit values in configuration registers, they are always processed as signed integers in the range of -32768…+32767. You shall

VAISALA _______________________________________________________________________ 185

User's Guide _______________________________________________________________________ use the floating point registers to write values outside this 16-bit signed integer range. Maximum writable value is 32767 also for configuration registers that do not accept negative values.

Measurement Data (Read-Only)

p w p ws h

ΔT a

NTP

H

2

O

T d a x

T w

H

2

O

Name

RH

T

T d

T d/f

T d/f

(atm)

(atm)

Table 38 Measurement Data Registers

Float

0001…0002

0003…0004

0007…0008

0009…0010

0011…0012

0013…0014

0015…0016

0017…0018

0019…0020

0021…0022

0023…0024

0025…0026

0027…0028

0031…0032

0033…0034

0065…0066

Integer

0257 (×0.01)

0258 (×0.01)

0260 (×0.01)

0261 (×0.01)

0262 (×0.01)

0263 (×0.01)

0264 (×0.01)

0265 (×0.01)

0266 (×0.01)

0267 (×1)

0268 (×0.1)

0269 (×0.1)

0270 (×0.01)

0272 (×0.01)

0273 (×0.01)

0289 (×1)

Unit

%

°C

°C

°C

°C

°C g/m³ g/kg

°C ppm

V hPa hPa kJ/kg

°C g/m³ ppm

W

Available measurements depend on the instrument configuration. Values may be unavailable also in case of device failure. Read status registers or exception status outputs to check for failures.

NOTE Only real-time data can be read from the instrument. Data that is recorded in the transmitter’s memory (internal memory or data logger module) cannot be read through Modbus.

186 __________________________________________________________________ M210704EN-H


NOTE

Status Registers (Read-Only)

Table 39 Status Registers

Name

Fault status

Online status

Error code (bits 15…0)

Error code (bits 31…16)

Address Description

0513

0514

0516

0517

1 = No errors

1 = Online data available

Bit field that represents the

error codes listed in Table 32 on page 151. Active errors are

set to 1. For example, if bit 14 is set to 1, error code E14 is active.

Error information can retrieved also with function code 08, sub-function

02.

Basic status information of the DMT340 transmitter is also available with the Read Exception Status function code 07. For details, see section

Exception Status Outputs on page 188.

Configuration Registers

Configuration parameter registers are used to configure the measurement.

Writing out-of-range values is silently ignored.

Table 40 Configuration Parameter Registers

Name

Pressure setting default value

Pressure setting

Molecular weight for ppm w

calculation

Float

0769…0770

0771…0772 temporary value

Sensor purge interval 0773…0774

0775…0776

Integer

1025 (×1)

1026 (×1)

Valid Range

0…9999 hPa

0…9999 hPa

1027 (×1) 10…2880 min

1028 (×0.001) 0…999.999 g/mol

If you modify the pressure setting repeatedly, modify the temporary value at register 0771...0772 (1026) instead of the permanent setting at register 0769…0770 (1025). Set the temporary value to zero to return to the default pressure setting.

Non-metric units are not available on Modbus. If they are needed, calculate the conversion outside the transmitter.

VAISALA _______________________________________________________________________ 187

User's Guide _______________________________________________________________________

Configuration flags are used to select some basic options of the instrument and to manually start the sensor operations.

Table 41 Configuration Flag Registers

Name

Standard filtering on/off

Address

1281

Extended filtering on/off 1282

Automatic sensor purge on/off 1283

Description

1 = Filtering on

1 = Extended filtering on

Start-up sensor purge on/off

Sensor purge in progress

AutoCal in progress

1284

1285

1286

1 = Automatic purge on.

See configuration register

0773…0774 (1027).

1 = Start-up purge on

1 = Purge in progress

(write 1 for manual start)

1 = AutoCal in progress

(write 1 for manual start)

Flags 1281 and 1282 are mutually exclusive.

Some of the configuration registers might not have an effect depending on the instrument model and configuration.

Other configuration settings are not usually needed and are not available using the Modbus interface. The service cable must be used to change other configuration settings if needed.

Exception Status Outputs

Exception status outputs (read with function code 07) tell the summary of

the DMT340 transmitter status as described in Table 42 below.

Table 42 DMT340 Exception Status Outputs

Output

0 (0x01)

1 (0x02)

Name

Fault status

Online status

Description

1 = No errors

1 = Online data available

Status information is available also with register access; see section

Status Registers (Read-Only) on page 187.

188 __________________________________________________________________ M210704EN-H


Diagnostic Sub-Functions

DMT340 supports some of the Modbus diagnostic functions described in the Modbus Application Protocol Specification V1.1b. These diagnostic

functions are accessed with function code 08. See Table 43 below for

details.

Table 43 DMT340 Modbus Diagnostics

Code

00 (0x00)

01 (0x01)

Sub-Function Name

Return Query Data

Restart Communications

Option

Notes

Cancels the “Listen Only” mode.

Data field must be set to “00 00” for Restart Communications

Option. Sub-Function 01 with data field “FF 00” is rejected.

02 (0x02) Return Diagnostic Register Non-zero if there are active transmitter errors.

04 (0x04) Force Listen Only Mode

10 (0x0A) Clear Counters and

Diagnostic Register

11 (0x0B) Return Bus Message Count Total number of messages seen

12 (0x0C) Return Bus Communication

Error Count

For same error information, see status registers 0516 and 0517.

The value of the Diagnostic

Register is a logical OR of these two status registers.

Puts device “off-line”

Diagnostic Register cannot be cleared on the bus/interface

Number of messages with bad

Modbus RTU CRC or Modbus

TCP frame

13 (0x0D) Return Bus Exception Error

Count

Number of Modbus exception responses sent

14 (0x0E) Return Slave Message Count Number of Modbus messages processed

15 (0x0F) Return Slave No Response

Count

Number of Modbus messages received without sending a response. This happens for received broadcast messages

(Modbus RTU only) or when

DMT340 is in the “Listen Only” mode.

Although Modbus Diagnostics are standardized only for serial line devices, DMT340 supports the same diagnostic functions also on

Modbus TCP.

NOTE Resetting, powering up the transmitter, or reselecting the Modbus mode

(by serial command or with the user interface) resets all Modbus diagnostic counters and cancels any “Listen Only” mode.

VAISALA _______________________________________________________________________ 189

User's Guide _______________________________________________________________________

Device Identification Objects

DMT340 Modbus conforms to the extended identification level defined in the Modbus Application Protocol Specification V1.1b. Both stream access and individual access to the objects is supported.

Table 44 DMT340 Modbus Device Identification

Object Id

0x00

0x01

0x02

0x03

0x04

0x80

0x81

0x82

Object Name

VendorName

ProductCode

MajorMinorVersion

VendorUrl

ProductName

SerialNumber

CalibrationDate

CalibrationText

Description

“Vaisala”

Product code (e.g. “DMT340”)

Software version (e.g. “5.10”)

“http://www.vaisala.com/”

Product name of the instrument

Serial number (e.g. “D0710040”)

Date of the last calibration

(e.g. “2011-02-07”, empty if not available)

Information text of the last calibration

(empty if not available)

Exception Responses

Exception responses from the transmitter are according to the Modbus

Application Protocol Specification V1.1b.

Table 45 DMT340 Modbus Exception Responses

Code Name

01

02

03

ILLEGAL FUNCTION

ILLEGAL DATA ADDRESS

ILLEGAL DATA VALUE

Reason

Unsupported function code

Address out of valid ranges

Otherwise invalid request

Accessing unavailable (unsupported or temporarily missing) registers

inside ranges specified in Table 38 on page 186 does not generate an

exception. “Unavailable” value (a quiet NaN for floating point data or zero for integer data) is returned instead. An exception is generated only

for any access outside the register blocks defined in section Register Map on page 184.

190 __________________________________________________________________ M210704EN-H

www.vaisala.com

*M210704EN*

Vaisala DMT340 manual

Assistant Bot

USER'S GUIDE

Vaisala DRYCAP® Dewpoint and

Temperature Transmitter Series

DMT340

Table of Contents

List of Figures

List of Tables

CHAPTER 1

GENERAL INFORMATION

About This Manual

Contents of This Manual

Version Information

Documentation Conventions

Safety

ESD Protection

Recycling

Regulatory Compliances

EU Declaration of Conformity

Transmitters with LAN or WLAN Interface

Transmitters with WLAN Interface

Trademarks

Software License

Warranty

CHAPTER 2

PRODUCT OVERVIEW

Introduction to DMT340

Basic Features and Options

Structure of the Transmitter

Probe Options

CHAPTER 3

INSTALLATION

Mounting the Housing

Standard Mounting without Mounting

Plate

Wall Mounting with Wall Mounting Kit

Mounting with DIN Rail Installation Kit

Pole Installation with Installation Kit for

Pole or Pipeline

Mounting the Rain Shield with

Installation Kit

Panel Mounting Frame

Wiring

Cable Bushings

Grounding the Cables

Transmitter Housing Grounding

Signal and Power Supply Wiring

Connections to a 24 VAC Power Supply

Probe Mounting

DMT342 Small-size Flanged Probe for

Use with Sampling Cell

DMT344 For High-pressure Applications

DMT347 Small Pressure-tight Probe

Pressure-Tight Swagelok Installation Kits for DMT347

DMT348 For Pressurized Pipelines

Tightening the Clasp Nut

Ball Valve Installation Kit for DMT348

Leak Screw Installation

Mounting the Probe Directly to the

Process

Sampling Cell for DMT348

Optional Modules

Power Supply Module

Galvanic Isolation of the Power Supply

Third Analog Output

Alarm Relays

RS-422/485 Interface

LAN Interface

WLAN Interface

Data Logger Module

8-Pin Connector

CHAPTER 4

OPERATION

Getting Started

Display/Keypad

Basic Display

Graphic History

Menus and Navigation

Factory Settings