HMT120 User's Guide in English

HMT120 User's Guide in English
USER'S GUIDE
Vaisala HUMICAP® Humidity and
Temperature Transmitter Series
HMT120
M211244EN-B
PUBLISHED BY
Vaisala Oyj
P.O. Box 26
FI-00421 Helsinki
Finland
Phone (int.): +358 9 8949 1
Fax:
+358 9 8949 2227
Visit our Internet pages at www.vaisala.com.
© Vaisala 2013
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.
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 ............................................................................ 5
About This Manual ................................................................... 5
Contents of This Manual ....................................................... 5
Version Information ............................................................... 6
Related Manuals ................................................................... 6
Documentation Conventions ................................................. 6
Safety ......................................................................................... 7
ESD Protection ...................................................................... 7
Recycling .................................................................................. 7
Regulatory Compliances ......................................................... 8
Patent Notice ............................................................................ 8
Trademarks ............................................................................... 8
License Agreement .................................................................. 8
Warranty .................................................................................... 8
CHAPTER 2
PRODUCT OVERVIEW .................................................................................. 9
Introduction to the HMT120 Humidity and Temperature
Transmitter ................................................................................ 9
Accessories ......................................................................... 10
Fixed and Remote Probe Models........................................ 10
Optional Display .................................................................. 10
Interchangeable Probe ........................................................ 10
Constant Output Probe ....................................................... 11
Transmitter Components ..................................................... 12
CHAPTER 3
INSTALLATION ............................................................................................ 13
Opening the Transmitter Cover ............................................ 13
Mounting ................................................................................. 14
Wall Mounting...................................................................... 14
Installation with Rain Shield ................................................ 15
Installation with Radiation Shield ........................................ 16
Duct Installation Kit ............................................................. 17
Probe Assembly with Duct Installation Kit ..................... 18
Drilling Instructions for Duct Installation Kit ................... 18
Probe Mounting Flange ....................................................... 19
Probe Mounting Clamp ....................................................... 20
Connections ............................................................................ 21
CHAPTER 4
SERVICE PORT ........................................................................................... 23
Using the Service Port ........................................................... 23
Installing the Driver for the USB Cable ............................... 23
VAISALA _________________________________________________________________________ 1
User's Guide _______________________________________________________________________
Terminal Application Settings .............................................. 24
List of Serial Commands ....................................................... 26
Device Information and Status .............................................. 27
Show Device Information..................................................... 27
Set/Show Available Quantities ............................................ 28
Set/Show Calibration Date .................................................. 28
Set/Show Calibration Information ........................................ 29
Show Analog Output Status ................................................ 30
Show System Information ................................................... 31
Show Firmware Version ...................................................... 31
Serial Line Output Commands .............................................. 31
Start Continuous Outputting ................................................ 31
Stop Continuous Outputting ................................................ 32
Set/show Output Interval ..................................................... 32
Output a Reading Once ....................................................... 32
Calibration Commands .......................................................... 33
Calibrate Humidity Measurement ........................................ 33
Restore Probe RH Factory Calibration ................................ 34
Calibrate Temperature Measurement ................................. 34
Restore Probe T Factory Calibration ................................... 35
Calibrate Analog Output ...................................................... 35
Configuring Serial Line Operation ........................................ 36
Set/Show Serial Line Settings ............................................. 36
Set/Show Terminal Echo ..................................................... 36
Set/Show Serial Interface Mode .......................................... 37
Configuring Measurement Parameters ................................ 37
Set/Show Environmental Parameters ................................. 37
Configuring Analog Output ................................................... 38
Set/show Analog Output Error Levels ................................. 38
Set/show Analog Output Quantity and Scaling ................... 38
Test Analog Outputs ............................................................ 40
Other Commands.................................................................... 41
Set/show Displayed Quantities ............................................ 41
Set/show Output Formatting ................................................ 42
Display Command List......................................................... 43
Display Active Errors ........................................................... 43
Save Changed Settings ....................................................... 43
Restore Saved Settings ....................................................... 44
Reset Transmitter ................................................................ 44
Restore Factory Settings ..................................................... 44
Set/show Output Unit........................................................... 45
CHAPTER 5
MAINTENANCE ............................................................................................ 47
®
Replacing the HUMICAP Sensor ......................................... 47
Fixed and Remote Probe Models ........................................ 47
Removing and Fastening the Probe ..................................... 48
Fixed Probe Model .............................................................. 48
Remote Probe Model........................................................... 49
Calibration and Adjustment ................................................... 50
HMT120 Push-Button Calibration ........................................ 50
Humidity and Temperature Adjustment ............................... 51
Adjustment with HM70......................................................... 54
2 ____________________________________________________________________ M211244EN-B
_________________________________________________________________________________
Field Checking and Adjustment Using a Calibrated
Reference Probe ............................................................ 55
One-Point Adjustment Using a Calibrator ...................... 55
Two-Point Adjustment Using a Calibrator ...................... 56
LiCl-NaCl Adjustment ..................................................... 57
Temperature Field Check and Adjustment by Using a
Calibrated Reference Probe .......................................... 58
Adjustment with HMI41 ....................................................... 59
Connections and Selecting the Calibrator Function....... 60
Offset and Gain Adjustments ......................................... 61
HMI41 as a Reference Meter .................................... 62
HMI41 as a Terminal................................................. 63
Troubleshooting ............................................................. 64
Analog Output Tests .............................................................. 65
CHAPTER 6
TROUBLESHOOTING ................................................................................. 67
Error Codes ............................................................................. 67
Solving Typical Problems...................................................... 68
Analog Output Error Notification .......................................... 69
Technical Support .................................................................. 69
CHAPTER 7
TECHNICAL DATA ...................................................................................... 71
Options and Accessories ...................................................... 73
Transmitter Dimensions ........................................................ 74
APPENDIX A
CALCULATION FORMULAS ...................................................................... 77
Dewpoint Temperature .......................................................... 78
Dew/frostpoint Temperature ................................................. 78
Mixing Ratio ............................................................................ 79
Absolute Humidity.................................................................. 79
Enthalpy .................................................................................. 79
Saturation Vapor Pressure .................................................... 80
Water Vapor Pressure ............................................................ 81
Accuracies of Calculated Variables ..................................... 81
Accuracy of Dewpoint Temperature °C ............................... 81
Accuracy of Mixing Ratio g/kg (Ambient Pressure 1013
mbar) ................................................................................... 81
Accuracy of Wet Bulb Temperature °C ............................... 82
Accuracy of Absolute Humidity g/m³ ................................... 82
INDEX ........................................................................................................... 83
VAISALA _________________________________________________________________________ 3
User's Guide _______________________________________________________________________
List of Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
HMT120 Components .............................................................. 12
Opening the Transmitter Cover ................................................ 13
HMT120 Wall Mounting ............................................................ 14
HMT120 Installation with Rain Shield ....................................... 15
Installation of the Probe with Radiation Shield ......................... 16
Probe Installation with the Duct Installation Kit ........................ 17
Assembly of the Probe with Duct Installation Kit ...................... 18
Drilling Instructions ................................................................... 18
Optional Probe Mounting Flange .............................................. 19
Optional Probe Mounting Clamp .............................................. 20
HMT120 Component Board ...................................................... 21
Isolated Current-Loop Wiring.................................................... 22
PuTTY Terminal Application ..................................................... 25
Removing the Humidity Probe (Fixed Probe Model) ................ 48
Removing the Humidity Probe (Remote Probe Model) ............ 49
Adjustment Buttons .................................................................. 50
Location of the MI70 Probe and Cable Connector Ports .......... 54
Example of the MI70 Adjustment Menu ................................... 56
Example of the MI70 Adjustment Mode Graph Display............ 56
Location of the HMI41 Calibration Connector .......................... 59
HMT120 Output Current Measurement .................................... 65
Dimensions of the Fixed Probe Model in mm (inches) ............. 74
Dimensions of the Remote Probe Model in mm (inches) ......... 75
List of Tables
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
Table 11
Table 12
Table 13
Table 14
Manual Revisions ....................................................................... 6
Related Manuals ......................................................................... 6
Wiring Table.............................................................................. 22
Default Serial Interface Setting ................................................. 24
Serial Port Commands ............................................................. 26
Common Problems During Adjustment and Their Remedies .. 64
Error Codes and Texts ............................................................. 67
Troubleshooting Table .............................................................. 68
Relative Humidity Measurement Specifications ....................... 71
Temperature Measurement Specifications ............................... 71
Operating Environment Specifications ..................................... 72
Inputs and Outputs ................................................................... 72
Mechanical Specifications ........................................................ 72
Options and Accessories .......................................................... 73
4 ____________________________________________________________________ M211244EN-B
Chapter 1 _________________________________________________________ General Information
CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the manual and HMT120 Series.
About This Manual
This manual provides information for installing, operating, and
maintaining the Humidity and Temperature Transmitter HMT120.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, This chapter provides general notes
for the manual and HMT120 Series.
- Chapter 2, Product Overview, introduces the features, components and
accessories of the HMT120 Series.
- Chapter 3, Installation, provides you with information that is intended
to help you install the HMT120
- Chapter 4, Service Port, describes the service port of the HMT120.
- Chapter 5, Maintenance, provides information that is needed in basic
maintenance of HMT120.
- Chapter 6, Troubleshooting, describes error messages and analog
output error behavior, troubleshooting for possible problems, and
provides contact information for technical support
- Chapter 7, Technical Data, provides the technical data of the
HMT120.
- Appendix A, Calculation Formulas, contains the formulas used for the
calculated output quantities.
- INDEX
VAISALA _________________________________________________________________________ 5
User's Guide _______________________________________________________________________
Version Information
Table 1
Manual Code
M211244EN-B
M211244EN-A
Manual Revisions
Description
June 2013. This version. New probe options added.
Installation and operating instructions updated.
November 2010. First version.
Related Manuals
Table 2
Manual Code
M210185EN
M210297EN
M210316EN
M211060EN
Related Manuals
Manual Name
Humidity Calibrator HMK15 User's Guide
Hand-held Humidity and Temperature Meter HM70
User's Guide
HMI41 Indicator and HMP41/45/46 Probes
Operating Manual
HMP60 and HMP110 Series Probe User's Guide
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.
6 ____________________________________________________________________ M211244EN-B
Chapter 1 _________________________________________________________ General Information
Safety
The Humidity and Temperature Transmitter HMT120 delivered to you
has been tested for safety and approved as shipped from the factory. Note
the following precautions:
CAUTION
Do not modify the unit. Improper modification can damage the product
or lead to malfunction.
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. It is possible to damage the product,
however, 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:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench.
- When an ESD workbench is not available, ground yourself to the
equipment chassis with a wrist strap and a resistive connection cord.
- If you are unable to take either of the above precautions, touch a
conductive part of the equipment chassis with your other hand before
touching ESD sensitive components.
- Always hold component boards by the edges and avoid touching the
component contacts.
Recycling
Recycle all applicable material.
Dispose of the unit according to statutory regulations. Do not dispose of
with regular household refuse.
VAISALA _________________________________________________________________________ 7
User's Guide _______________________________________________________________________
Regulatory Compliances
Vaisala HUMICAP® Humidity and Temperature Transmitter Series
HMT120 is in conformity with the provisions of the following EU
directives:
-
EMC-Directive (2004/108/EC)
Conformity is shown by compliance with the following standards:
- EN 61326-1: Electrical equipment for measurement, control and
laboratory use – EMC requirements – for use in industrial locations.
- EN 55022 + Am1: Information technology equipment – Radio
disturbance characteristics – Limits and methods of measurement.
Patent Notice
The HMT120 is protected by the following patents and their
corresponding national rights:
Finnish patent 98861, French patent 6650303, German patent 69418174,
Japanese patent 3585973, UK patent 0665303, U.S. patent 5607564.
Trademarks
HUMICAP is a registered trademark of Vaisala Oyj.
License Agreement
All rights to any software are held by Vaisala or third parties. The
customer is allowed to use the software only to the extent that is provided
by the applicable supply contract or Software License Agreement.
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.
8 ____________________________________________________________________ M211244EN-B
Chapter 2 ___________________________________________________________ Product Overview
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the features, components and accessories of the
HMT120 Series.
The Vaisala range of relative humidity measurement instruments covers
all the applications from ventilation to process control in demanding
conditions. For more information about other Vaisala relative humidity
instruments, please contact your Vaisala representative or visit
www.vaisala.com.
Introduction to the HMT120 Humidity and
Temperature Transmitter
HMT120 measures relative humidity and temperature and converts it to
analog current loop outputs. Other quantities, such as dewpoint (Td) can
be calculated from the basic RH and T values according to the device
configuration. HMT120 is powered with a 10 ... 30 VDC external loop
voltage (20 ... 30 VDC when RL <500 ohms) and it outputs two analog
current signals with nominal 4 ... 20 mA range.
HMT120 transmitter's output quantities are configurable. Available
quantities for outputs are limited to two at the time. These two quantities
can be used freely at any outputs (display, service port and analog current
loop outputs).
Available quantities are RH, T, Td, Td/f, a, x, h, Tw, pws, and pw.
The default output quantities are set at the factory during order time.
These factory preset quantity selections can be changed afterwards via
service port if necessary.
The HMT120T and HMT120H models are single-parameter transmitters.
The only output quantity of HMT120T is temperature. The output of the
HMT120H can be configured to be any one of the humidity-related
quantities (RH, Td, Td/f, a, x, h, Tw, pws and pw).
VAISALA _________________________________________________________________________ 9
User's Guide _______________________________________________________________________
Accessories
The following accessories are optionally available:
-
Duct installation kit
Rain shield with installation kit
Rain/solar radiation shield installation kit (for pole installation)
Probe mounting flange
Probe mounting clamp
Constant output probe (HMP1100REF, gives constant RH and
T values)
Fixed and Remote Probe Models
The HMT120 is available either with a fixed probe directly attached to
the transmitter housing or a remote probe with different (3/5/10/20 m)
cable lengths. All extension cables can be easily cascaded in order to
obtain longer reach; see Options and Accessories on page 73.
Optional Display
The HMT120 is also available with an optional graphical 128*64 pixel
resolution LCD display. The display shows the measurement results of
selected parameters in selected units (defined at the time of ordering).
The parameters are displayed simultaeously at two separate rows on the
display.
Interchangeable Probe
The HMP110 relative humidity probe used in the HMT120 transmitter is
fully interchangeable. You can easily remove the probe and replace it
with a new one without having to adjust the transmitter. You have the
following options when purchasing a new probe from Vaisala:
-
NOTE
Order a new probe and keep your current one.
Order a new probe and return the old one to Vaisala (replacement
probe).
Only probes that have a compatible digital output (VDIGI mode) can be
used with HMT120 transmitter. Compatible probes have the letter "V" as
the first letter in their order code. The order code is written on the probe.
10 ___________________________________________________________________ M211244EN-B
Chapter 2 ___________________________________________________________ Product Overview
Constant Output Probe
The constant output probe HMP110REF is a testing accessory that can be
used to check the transmitter's functions and measurement signal transfer
chain all the way to the control system. The constant output probe does
not measure humidity and temperature; instead, it outputs constant
humidity and temperature readings.
The values output by the constant output probe are specified when
ordering. These values are written on an additional label on the probe
body.
The procedure for using the constant output probe is simply to replace
the original probe for the duration of the testing:
1.
2.
3.
4.
NOTE
Disconnect the normal probe from transmitter.
Connect the constant output probe to the transmitter.
Check that all used outputs (analog, display, serial line) show the
correct measurement values.
After checking the outputs, disconnect the constant output probe
and reconnect the original probe.
The transmitter goes to the error state for a short time when the probe is
changed. This is normal.
VAISALA ________________________________________________________________________ 11
User's Guide _______________________________________________________________________
Transmitter Components
Figure 1 below illustrates the main features of HMT120. On the left is a
remote probe model without display, and on the right is a fixed probe
model with the optional display. The numbers and arrows indicate the
main components of the transmitters.
1007-001
Figure 1
HMT120 Components
The following numbers refer to Figure 1 above:
1
2
3
4
5
=
=
=
=
=
Transmitter enclosure
Cable bushing: cable gland, cable grommet, or conduit fitting.
Probe cable
HMP110 probe
Plastic grid filter
See section Options and Accessories on page 73 for accessory parts and
their numbers.
12 ___________________________________________________________________ M211244EN-B
Chapter 3 ________________________________________________________________ Installation
CHAPTER 3
INSTALLATION
This chapter provides you with information that is intended to help you
install the HMT120.
Opening the Transmitter Cover
1.
2.
If the transmitter is not mounted already, hold it against a flat
surface.
Push on the cover with your thumb, and pull the bottom part of the
cover towards yourself.
1301-019
Figure 2
Opening the Transmitter Cover
VAISALA ________________________________________________________________________ 13
User's Guide _______________________________________________________________________
Mounting
Wall Mounting
1.
2.
Remove the transmitter cover. See section Opening the Transmitter
Cover on page 13.
Make sure that the HMT120 Humidity and Temperature
Transmitter is correctly aligned and attach it directly to the wall
with up to four screws (not included in the package).
1011-149
Figure 3
CAUTION
NOTE
HMT120 Wall Mounting
It is possible to damage the display when tightening the screws, as there
is not much room between the upper fastening holes and the exposed
display component. Be particularly careful when using a cordless drill.
Select the size and type of the fastening screws according to the wall
material (for example, wood or stone). Even though using all four screws
is strongly recommended, the HMT120 enclosure fastening holes are
initially covered with a thin plastic membrane, so less than four screws
could be also be used without sacrificing the ingress protection (IP) class
of the enclosure. The diameter of the fastening screws is typically
between 3.5 and 4 mm.
14 ___________________________________________________________________ M211244EN-B
Chapter 3 ________________________________________________________________ Installation
Installation with Rain Shield
The installation kit with rain shield includes a metal mounting plate and
a rain shield for the transmitter. Vaisala order code: 215109.
1011-150
Figure 4
1.
2.
3.
HMT120 Installation with Rain Shield
Fasten the metal mounting plate to the wall or pole with screws
(see Figure 4 above). Note the arrow on the mounting plate. Attach
the mounting plate with the arrow pointing upwards.
Drill holes for the screws in the HMT120 frame, and fasten
HMT120 Humidity and Temperature Transmitter to the metal
mounting plate with four (M4) screws.
Fasten the rain shield to the metal mounting plate with two (M6)
mounting screws.
VAISALA ________________________________________________________________________ 15
User's Guide _______________________________________________________________________
Installation with Radiation Shield
DTR504 with probe installation kit includes a rain/solar radiation shield
DTR504 and a plastic installation support for the humidity probe. Vaisala
order code: DTR504A. If you already have the DTR504 shield and need
only the installation support for the probe, it is available with Vaisala
order code 227777.
1.
2.
3.
Fasten the probe (item 2 in Figure 5 below) to the installation
support with a cable tie (item 5).
Insert and attach the support to the radiation shield by tightening
the plastic nut (3).
Attach the entire radiation shield/probe assembly to a pole mast
(pole mast diameter: 30 ... 60 mm/1.2 ... 2.3") with a U-bolt and a
support arm.
1303-034
Figure 5
Installation of the Probe with Radiation Shield
The following numbers refer to Figure 5 above:
1
2
3
4
6
=
=
=
=
=
DTR504
Probe
Plastic nut
Installation support (part no. 227777)
Probe
16 ___________________________________________________________________ M211244EN-B
Chapter 3 ________________________________________________________________ Installation
Duct Installation Kit
The duct installation kit includes a plastic pipe with a flange (Vaisala
order code: 215619). To install the HMP110 probe with the duct
installation kit, drill a hole to the duct wall, assemble the probe to the
duct installation kit, slide the probe head through the hole, and attach the
flange to the duct wall with four screws. See page 18 for details.
24
1
L
0505-176
Figure 6
Probe Installation with the Duct Installation Kit
The following explanations refer to Figure 6 above:
1
=
Tension screw
Distance L can be adjusted and locked in place with the tension screw.
VAISALA ________________________________________________________________________ 17
User's Guide _______________________________________________________________________
Probe Assembly with Duct Installation Kit
1
2
3
0505-177
Figure 7
Assembly of the Probe with Duct Installation Kit
The following numbers refer to Figure 7 above:
1
2
3
1.
2.
3.
=
=
=
HMP110
Duct installation kit
Probe cable
Slide the probe cable through the duct installation kit plastic pipe.
Attach the probe cable to the HMP110 Humidity Probe.
Attach probe assembly to the duct.
Drilling Instructions for Duct Installation Kit
.2
Ø3
42
4
Ø2
3
2
1
0505-178
Figure 8
Drilling Instructions
The following numbers refer to Figure 8 above:
1
2
3
=
=
=
Mounting screw
Tension screw
HMP110 assembled in duct installation kit plastic pipe
18 ___________________________________________________________________ M211244EN-B
Chapter 3 ________________________________________________________________ Installation
Drill the holes for the duct installation kit as follows:
1.
2.
Use a 24-mm drill bit to drill a hole to the duct wall for the
humidity probe.
Drill holes for the duct installation kit mounting screws around the
hole in a square arrangement, 42 mm apart from each other. Use a
3.2-mm drill bit to drill the holes for the mounting screws (four
ST4.2×16-C-Z DIN 7981 screws).
Probe Mounting Flange
The probe mounting flange (Vaisala order code: 226061) is a general
purpose mounting flange for 12 mm diameter probes. It can be used to
hold the HMP110 probe in a through-wall installation.
NOTE
The coaxial silicone plug that is delivered with the flange is not suitable
for use with the probe cable of the HMT120.
0911-109
Figure 9
Optional Probe Mounting Flange
VAISALA ________________________________________________________________________ 19
User's Guide _______________________________________________________________________
Probe Mounting Clamp
The optional mounting clamp makes it easy to install the probe on the
wall of the measurement environment. The probe can be detached for
calibration simply by loosening the lower screw. You can order a single
clamp (Vaisala order code 225501) or a set of 10 clamps (226067).
Installing the entire probe in the measurement environment prevents heat
conduction to the sensor, and is the recommended installation method.
1001-138
Figure 10
CAUTION
Optional Probe Mounting Clamp
Attaching the probe mounting clamp to a conductive wall material
should be avoided, since the potential galvanic connection to the power
supplies and uncontrolled earth current loops could cause measurement
errors or even damage to the HMT120 transmitter.
20 ___________________________________________________________________ M211244EN-B
Chapter 3 ________________________________________________________________ Installation
Connections
1
3
C
A
L
RH
T
ADJ
2
+
-
4
SHLD
SERVICE PORT
CH1CH1+
CH2CH2+
5
1011-151
Figure 11
HMT120 Component Board
The following numbers refer to Figure 11 above:
1
2
3
4
5
1.
2.
3.
=
=
=
=
=
Optional LCD display
Adjustment buttons
Indicator LEDs
Service port
Field wire terminals
Remove the transmitter cover. See section Opening the Transmitter
Cover on page 13.
Insert the signal wires through the selected cable gland/conduit
fitting in the bottom of the transmitter or alternatively through the
rubber grommet at the back side of the transmitter.
Connect the wires as indicated in Figure 12 and in Table 3 on page
22. Suitable wire size is between 0.5 mm2 and 1.5 mm2.
VAISALA ________________________________________________________________________ 21
User's Guide _______________________________________________________________________
NOTE
If an isolated output is required with current outputs, both channels
require their own power supply. CH1 is always required to be powered
because CH1 is the main output, and the transmitter will not operate if
only CH2 is connected.
4.
Close the cover by keeping it slightly tilted and first attaching it to
the fixing snaps at the top of the enclosure base and then pushing
the lower part of the cover firmly forward until it locks. The
transmitter is ready for use.
1011-152
Figure 12
Isolated Current-Loop Wiring
Table 3
Wiring Table
Terminal
1
2
3
4
5
Current Output (2-Wire, CH2 Isolated)
Cable shield (optional)
CH1- (signal and power supply -)
CH1+ (signal and power supply +)
CH2- (signal and power supply -)
CH2+ (signal and power supply +)
The numbers 1 ... 5 in the first column of the wiring table refer to Figure
12 above.
22 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
CHAPTER 4
SERVICE PORT
This chapter describes the service port of the HMT120.
Using the Service Port
HMT120 motherboard has an 8-pin RJ-45 connector for service use.
Service port uses RS-232 signaling levels. Vaisala offers an optional
USB cable (Vaisala order code 219685) for connecting the transmitter to
your PC.
NOTE
The service port is intended for short-term use such as calibration. For
permanent installation, use the analog output.
Connecting a PC to the service port may cause erroneous analog output
because of a possible ground loop. Use the service port for service only
and disconnect the PC after the service operation.
The cable can also provide operation power to the transmitter, so the
wires at the screw terminals need not to be connected in order to operate
the transmitter.
If you have not used the HMT120 USB cable before, install the driver
that came with the cable. Refer to section Installing the Driver for the
USB Cable below for detailed instructions.
Installing the Driver for the USB Cable
Before taking the USB service cable into use, you must install the
provided USB driver on your PC.
1.
2.
3.
Check that the USB service cable is not connected. Disconnect the
cable if you have already connected it.
Insert the media that came with the cable, or download the latest
driver from www.vaisala.com.
Execute the USB driver installation program (setup.exe), and
accept the installation defaults. The installation of the driver may
take several minutes.
VAISALA ________________________________________________________________________ 23
User's Guide _______________________________________________________________________
4.
5.
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.
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.
There is no reason to uninstall the driver for normal use. However, if you
wish to remove the driver files and all Vaisala USB cable devices, you
can do so by uninstalling the entry for Vaisala USB Instrument Driver
from the Programs and Features menu in the Windows Control Panel.
In Windows XP and earlier Windows versions the menu is called Add or
Remove Programs.
Terminal Application Settings
The default settings of the HMT120 serial interface are presented in
Table 4.
Table 4
Property
Baud rate
Parity
Data bits
Stop bits
Flow control
Default Serial Interface Setting
Value
19200
None
8
1
None
The steps below describe how to connect to the HMT120 using the
PuTTY terminal application for Windows (available for download at
www.vaisala.com) and a USB serial interface cable:
1.
2.
3.
NOTE
Connect the USB cable between your PC and the service port of the
HMT120.
Start the PuTTY application.
Select the Serial settings category, and check that the correct COM
port is selected in the Serial line to connect to field.
You can check which port the USB cable is using with the Vaisala USB
Instrument Finder program that has been installed in the Windows
Start menu.
24 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
4.
5.
NOTE
Check that the other serial settings are correct for your connection,
and change if necessary. Flow control should be set to None unless
you have a reason to change it.
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.
6.
You may need to adjust the Local echo setting in the Terminal
category to see what you are typing on the serial line. To access the
configuration screen while a session is running, click the right
mouse button over the session window, and select Change
Settings... from the pop-up menu.
0807-004
Figure 13 PuTTY Terminal Application
VAISALA ________________________________________________________________________ 25
User's Guide _______________________________________________________________________
List of Serial Commands
All commands can be issued either in uppercase or lowercase.
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.
Whenever you change any of the parameters and want to store the
changes permanently, use the SAVE command.
Table 5
Command
?
ACAL
AERR
AOUT
ASEL
ATEST
CALCS
CDATE
CRH
CRHCLR
CT
CTCLR
CTEXT
DSEL
ECHO
ENV
ERRS
FORM
FRESTORE
HELP
INTV
R
RESET
RESTORE
S
SAVE
SEND
SERI
SMODE
SYSTEM
UNIT
VERS
Serial Port Commands
Description
Show transmitter information
Calibrate analog outputs
Set/show analog output error levels
Show analog output status
Set/show analog output quantities and scaling
Test analog outputs
Set/show measured quantities
Set/show calibration date
Calibrate probe RH
Restore probe RH factory calibration
Calibrate probe T
Restore probe T factory calibration
Set/show calibration info
Set/show displayed quantities
Set/show terminal echo mode
Set/show environmental parameters
Display active errors
Set/show output formatting
Restore all transmitter settings to factory defaults
List available commands
Set/show the continuous output interval
Start continuous outputting
Reset transmitter
Restores the latest saved settings
Stop continuous outputting
Save changed settings to FLASH memory
Output the reading once
Set/show Service Port settings (Default: 19200 N 8 1)
Set the serial interface mode
Show transmitter information and build date
Set/show output unit
Show firmware version of the transmitter
26 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
Device Information and Status
Show Device Information
The ? command outputs a listing of device information.
?<cr>
Example:
>?
Device Name
SW Name
SW model
SW version
Serial number
Unit
Ch1 Status
Ch2 Status
Probe name
Probe SW
Probe SW date
Probe SN
>
:
:
:
:
:
:
:
:
:
:
:
:
HMT120
HMT120/130
HMT120
0.9.3.389
"F2220101"
METRIC
ON
ON
"HMP110"
"1.01.1"
""
"F0740011"
VAISALA ________________________________________________________________________ 27
User's Guide _______________________________________________________________________
Set/Show Available Quantities
The CALCS command shows the abbreviations of the quantities
measured by HMT120. The command can also be used to select the
desired quantities for measurement. Only after the quantities have been
set with the CALCS command, can these quantities be selected for
different outputs (see commands DSEL, ASEL, and FORM). The
quantities in DSEL, ASEL, and FORM must match with CALCS.
CALCS [q1 q2]<cr>
where
q1, q2
=
Examples:
Any two of the allowed quantity parameters, i.e. RH, T,
TD, TDF, A, X, H, TW, PWS, PW
>calcs
RH Td
>
calcs td t
>
NOTE
Single-parameter transmitters HMT120H and HMT120T have only one
quantity (T for HMT120T, and RH, TD, TDF, A, X, H, TW, PWS, PW
for HMT120H.)
Set/Show Calibration Date
Use the CDATE command to show or set the calibration date field.
(Calibration refers to the calibration of the HMT120's analog outputs.)
CDATE [date]<cr>
where
date
=
Calibration date in format yyyy-mm-dd
Examples:
>cdate
Calibrated
>
: "NOT SET"
>cdate 2009-06-22
Calibrated
>
: "2009-06-22"
28 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
Set/Show Calibration Information
Use the CTEXT command to show or set the calibration info field.
(Calibration refers to the calibration of the HMT120's analog outputs.)
CTEXT [location]<cr>
where
location
= Freely defined text string typically indicating the
calibration location
Examples:
>ctext
Calib. info: "VAISALA HELSINKI"
>
>ctext "Calibration lab 2"
Calib. info: "Calibration lab 2"
>
VAISALA ________________________________________________________________________ 29
User's Guide _______________________________________________________________________
Show Analog Output Status
The AOUT command shows the following information:
-
Analog out mode is the output mode for the channel, for example
0 ... 10 V.
Error level is the level that the analog output is set to in case of
transmitter error.
Status indicates the current status of the channel. The statuses are
ON: Normal measurement operation.
OFF: No quantity selected for the channel using the ASEL
command. See section Set/show Analog Output Quantity and
Scaling on page 38.
ERROR: Transmitter error, channel set to error level.
TEST: Analog channel being tested using the ATEST command.
See section Test Analog Outputs on page 40.
AOUT<cr>
Example:
>aout
*** ANALOG OUTPUT 1
Ch1 Analog out mode
Ch1 Notification
Ch1 Error level
Ch1 Status
Ch1 Quantity
RH lo
RH hi
RH
Current
*** ANALOG OUTPUT 2
Ch2 Analog out mode
Ch2 Notification
Ch2 Error level
Ch2 Status
Ch2 Quantity
T lo
T hi
T
Current
>
***
: 4_20MA
: ON
: 3.6
: ON
: RH
: 0
: 100
: 23.32 %
: 7.73 mA
***
: 4_20MA
: ON
: 3.6
: ON
: T
: -60
: 100
: 23.66 'C
: 12.37 mA
30 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
Show System Information
SYSTEM<cr>
Example:
>system
Device Name
SW Name
SW model
SW version
Serial number
>
:
:
:
:
:
HMT120
HMT120/130
HMT120
1.0.0.500
A1234567
Show Firmware Version
VERS<cr>
Example:
>vers
HMT120 / 0.1.0.103
>
Serial Line Output Commands
Start Continuous Outputting
Use the R command to start the continuous outputting of measurement
values as an ASCII text string to the serial line. The output always
includes the readings of the currently selected analog output quantities.
R [X]<cr>
Example:
>r
RH= 25.10% T= 24.77'C
RH= 25.12% T= 24.96'C
…
Outputting the results continues in intervals issued with the command
INTV. You can stop the output by entering the S command.
Output data formatting can be defined with FORM command. With X
parameter the transmitter will output RH + T value in predefined format
regardless of what quantities are selected.
VAISALA ________________________________________________________________________ 31
User's Guide _______________________________________________________________________
Stop Continuous Outputting
Use the S command to stop the continuous measurement output:
S<cr>
Set/show Output Interval
Use the INTV command to show or set the output interval of the serial
line measurement messages (applies when R command or RUN mode is
used). The shortest output interval is one second. This command has no
effect on the operation of the analog outputs.
INTV [n xxx]<cr>
where
n
xxx
=
=
Time interval in range 1 ... 255
Time unit = "S", "MIN", or "H"
Examples:
>intv
Value
Unit
>
: 1
: S
>intv 3 min
Value
Unit
>
: 3
: MIN
Output a Reading Once
Use the SEND command to output a single measurement reading from
the transmitter.
SEND [X]<cr>
Example:
>send
RH= 25.12 % T= 24.91 'C
>
With X parameter the transmitter will output RH + T value in predefined
format regardless of what quantities are selected.
32 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
Calibration Commands
Serial commands that are related to calibration are described below. For
the actual calibration procedures, see section Calibration and Adjustment
on page 50.
Calibrate Humidity Measurement
Use the CRH command to perform a one-point or two-point humidity
(RH) calibration.
CRH<cr>
When performing a one-point calibration, you need to place the probe in
a single humidity reference with RH < 50%. Run the command and enter
the exact RH of the reference after the measurement has stabilized. Exit
the command by pressing the ESC key before proceeding to the second
point (see example below). To update the value, press ENTER without
inputting a value.
For two-point calibration, the first point requires a RH < 35% humidity
reference, the second point must be RH > 50%.
Example 1: One-point calibration
>crh
RH:
11.29915720 Ref1 ? 11.3
Press ENTER to continue or ESC to exit
OK
>
Example 2: Two-point calibration
>crh
RH:
11.29915720 Ref1 ? 11.3
Press ENTER to continue or ESC to exit
RH:
75.04306440 Ref2 ? 75
OK
>
Example 3: No calibration, only updating the value
>crh
RH:
20.28000200 Ref1 ?
RH:
20.14000000 Ref1 ?
Calibration terminated with ESC
>
VAISALA ________________________________________________________________________ 33
User's Guide _______________________________________________________________________
Restore Probe RH Factory Calibration
Use the CRHCLR to restore the probe RH factory calibration.
CRHCLR<cr>
Example:
>crhclr
OK
>
Calibrate Temperature Measurement
Use the CT command to perform a one-point or two-point temperature
(T) calibration.
CT<cr>
When performing a one-point calibration, you need to place the probe in
a single temperature reference. Run the command and enter the exact
temperature of the reference after the measurement has stabilized. Exit
the command by pressing the ESC key before proceeding to the second
point. To update the value, press ENTER without inputting a value.
For two-point calibration, the second reference point must be at least
20 ºC warmer than the first. The measurement reading for the second
point will appear when this requirement is met.
Example 1: One-point calibration
>ct
T 21.9827 Ref1 ? 22
Press ENTER to continue or ESC to exit
OK
>
Example 2: Two-point calibration
>ct
T 22.0007 Ref1 ? 22
Press ENTER to continue or ESC to exit
T 44.9847 Ref2 ? 45
OK
>
Example 3: No calibration, only updating the value
>ct
T 22.0007 Ref1 ?
T 22.0145 Ref1 ?
Calibration terminated with ESC
>
34 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
Restore Probe T Factory Calibration
Use the CTCLR to restore the probe T factory calibration.
CTCLR<cr>
Example:
>ctclr
OK
>
Calibrate Analog Output
Use the ACAL command to calibrate the analog current loop outputs.
ACAL<cr>
After you give this command, the CH1 analog output of the transmitter
is set to the low limit (4mA). Measure the output and enter the measured
value. After entering the low limit, you must measure and enter the high
limit (20mA) also. The same procedure is then repeated with CH2.
Calculated coefficients are printed after the measured values are given.
Example:
>acal
Ch1 I1 (mA) ? 5.60
Ch1 I2 (mA) ? 18.40
-1.40562890E+03 a0
1.41171900E+03 a1
OK
Ch2 I1 (mA) ? 5.60
Ch2 I2 (mA) ? 18.40
-1.40562890E+03 a0
1.41171900E+03 a1
OK
>
NOTE
Question mark is displayed after certain stabilization time has expired.
Values should be entered only after question mark is displayed. Values
entered before question mark will be discarded.
VAISALA ________________________________________________________________________ 35
User's Guide _______________________________________________________________________
Configuring Serial Line Operation
Set/Show Serial Line Settings
Use the SERI command to show or set the serial line settings. Use the
SAVE command after changing the settings to store them. The new
settings will be taken into use when the transmitter is reset or powered
up.
SERI [b p d s]<cr>
where
b
p
d
s
=
=
=
=
baud rate (9600, 19200, 38400, 76800, 115200)
parity (n = none, e = even, o = odd)
data bits (7 or 8)
stop bits (1 or 2)
Examples:
>seri
Baud P D S
>
: 19200 N 8 1
>seri 9600 e 7 1
Baud rate
: 9600
Parity
: E
Data bits
: 7
Stop bits
: 1
>save
Saving settings...done
>
Set/Show Terminal Echo
To show or set the terminal echo status, use the ECHO command.
ECHO [ON/OFF]<cr>
Examples:
>echo
COM1 Echo
>
: OFF
>echo on
COM1 Echo
>
: ON
36 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
Set/Show Serial Interface Mode
Use the SMODE command to show or set the serial interface mode. Note
that a separate SAVE command is not needed to store the new serial
interface mode setting.
SMODE [STOP/RUN]<cr>
In STOP mode: outputting only when command is issued, any command
can be used.
In RUN mode: outputting automatically, only command S can be used.
Example:
>smode stop
Output mode
>
: STOP
Configuring Measurement Parameters
Set/Show Environmental Parameters
Use the ENV command to show or set the environmental compensation
values. In HMT120, the humidity measurement can be compensated for
ambient pressure. The value set using ENV command is a permanent
value which will survive a restart.
ENV [x.xxxx]<cr>
where
x.xxxx
=
Absolute pressure in the measuring environment.
The default is 1.013. The pressure unit is bar.
Example:
>env
Pressure (bar)
>
: 1.013
>env 0.980
Pressure (bar)
: 0.98
>save
Saving settings...done
>
NOTE
You can use the Vaisala Humidity Calculator to simulate the effect of
pressure change to dewpoint. The Humidity Calculator can be found at:
www.vaisala.com/humiditycalculator
VAISALA ________________________________________________________________________ 37
User's Guide _______________________________________________________________________
Configuring Analog Output
Set/show Analog Output Error Levels
Use the AERR command to show or set the analog output error levels.
AERR [level1 level2]<cr>
where
level1 level2 = Error levels for analog output channel
Examples:
>aerr
Ch1 Error level
Ch2 Error level
>
: 3.6
: 3.6
>aerr 3.85 3.86
Ch1 Error level
Ch2 Error level
>
: 3.85
: 3.86
Set/show Analog Output Quantity and
Scaling
After you have defined the quantities with the CALCS command, use the
ASEL command to show or set the quantity output by the analog
channels, and the scaling that is used. If you do not enter scaling limits,
default values are used. Valid quantities are: RH, T, TD, TDF, A, X, H,
TW, PWS, PW and NONE. NONE parameter disables analog output and
output is forced to error level.
ASEL [q1 q2] [lo1 hi1 lo2 hi2]<cr>
where
q1 q2
lo1 lo2
hi1 hi2
= Analog output channel quantities
= Low limits of scaling
= High limits of scaling
Syntax for single-parameter transmitters:
ASEL [q] [lo hi]<cr>
where
q
lo
hi
= Analog output channel quantity
= Low limit of scaling
= High limit of scaling
38 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
Examples:
>asel
Ch1 Quantity
RH lo
RH hi
Ch2 Quantity
T lo
T hi
>
:
:
:
:
:
:
RH
0
100
T
-60
100
>asel rh td
Ch1 Quantity
RH lo
RH hi
Ch2 Quantity
Td lo
Td hi
>
:
:
:
:
:
:
RH
0
100
TD
-40
60
>asel t td 0 60 -20 60
Ch1 Quantity
: T
T lo
: 0
T hi
: 60
Ch2 Quantity
: TD
Td lo
: -20
Td hi
: 60
>
>asel rh none
Ch1 Quantity
RH lo
RH hi
Ch2 Quantity
>
:
:
:
:
>asel none none
Ch1 Quantity
Ch2 Quantity
>
: NONE
: NONE
RH
0
100
NONE
VAISALA ________________________________________________________________________ 39
User's Guide _______________________________________________________________________
Test Analog Outputs
Use the ATEST command to test the analog outputs. The ATEST
command will force the output to the given value, which can then be
measured with a calibrated multimeter.
ATEST command affects only the analog outputs and hence it does not
disable measurement functions. ATEST without parameters will exit the
test mode and let the measurement continue. It will also indicate the the
current analog output levels in normal measurement state.
ATEST [val1 val2]<cr>
where
val1 val2
=
Analog channel output value (mA)
Examples:
>atest
CH1: 3.800000
CH2: 3.800000
>
>atest 3.9 3.9
CH1: 3.900000
CH2: 3.900000
>
40 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
Other Commands
Set/show Displayed Quantities
After you have defined the quantities with the CALCS command, use the
DSEL command to show or set the displayed quantities. Number of
parameters determine the display mode (ie. one or two rows). If one
quantity is given, display will switch to one row mode. If two quantities
are given, two-row mode is used. Valid quantities are: RH, T, TD, TDF,
A, X, H, TW, PWS, and PW.
DSEL [q1 q2]<cr>
where
Q1 q2
= Quantities to be shown on transmitter display
Syntax for single-parameter transmitters:
DSEL [q]<cr>
where
Q
= Quantity to be shown on transmitter display
Examples:
>dsel
1. quantity
2. quantity
>
: RH
: T
>dsel rh t
1. quantity
2. quantity
>
: RH
: T
>dsel t
1. quantity
>
: T
VAISALA ________________________________________________________________________ 41
User's Guide _______________________________________________________________________
Set/show Output Formatting
After you have defined the quantities with the CALCS command, use the
FORM command to set the output format for SEND and R commands.
FORM<format>
where
format = A formatting string, which can consist of following fields:
“”
String constant
x.y
Value length modifier. x is numbers before dot
and y is numbers after dot.
Ux
Unit field length. U…U format is also supported.
Q
Quantity name (e.g. rh, t, td etc.)
#t or \t Tabulator
#r or \r Carriage return
#n or \n Line feed (new line)
Note 1. Quantity must be after x.y and Ux modifiers.
Note 2. There must be a space between parameters, #r#n or \r\n is not supported.
Note 3. Max. string length is 80 characters.
Note 4. If Ux parameter is not used, unit is not displayed.
Examples:
>form "RH= " 3.2 U2 rh #r #n
>send
RH= 32.16 %
>
>form "t=" 4.1 U3 t \t "rh=" 3.2 U2 rh \r \n
>send
t= 22.5 'C
rh= 29.12 %
>
>form "t=" 4.1 U3 t \t "rh=" rh \r \n
>send
t= 22.3 'C
rh= 29.5 %
>
>form 3.2 UUU "RH=" rh \t "T=" t \r \n
>send
RH= 27.99 %
T= 23.34 'C
>
>form 3.3 rh " " t \r \n
>send
26.740 23.660
>
>form "->" "RH=" 3.2 U2 rh " " "T=" 3.1 U3 t #r #n
>send
->RH= 27.79 % T= 23.4 'C
>
42 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
Display Command List
Use the HELP command to display a list of available commands.
HELP<cr>
Display Active Errors
Use the ERRS command to display the currently active error codes. For
troubleshooting active errors, see Table 7 on page 67.
ERRS<cr>
Example (no active errors):
>errs
No errors.
>
Save Changed Settings
Use the SAVE command to save changed settings to the transmitter
FLASH memory. Most settings have to be saved or the changes are lost
at the next reset or power down.
NOTE
The SMODE command saves the new serial mode immediately;
a separate SAVE command is not needed.
The probe calibration commands (CRH, CT, CRHCLR, CTCLR) store
the parameters into the probe's memory automatically without a separate
SAVE command.
SAVE<cr>
Example:
>save
Saving settings...done
>
VAISALA ________________________________________________________________________ 43
User's Guide _______________________________________________________________________
Restore Saved Settings
Use the RESTORE command to restore saved settings from transmitter
FLASH memory to RAM. All unsaved changes will be lost.
RESTORE<cr>
Example:
>restore
Restoring default settings...done
>
Reset Transmitter
Use the RESET command to reset the transmitter. Upon reset or powerup, the transmitter enters the serial mode that has been set with the
SMODE command.
After reset the configuration is loaded from FLASH memory. That
configuration can be altered with SAVE-command.
RESET<cr>
Example (transmitter set to serial mode STOP, will output transmitter
software version at reset):
>reset
HMT120 / 0.1.0.001
Type "help" for command list
>
Restore Factory Settings
Use the FRESTORE command to restore the factory settings to the
transmitter. All user settings, including the user-performed calibration
corrections, will be lost. The transmitter will revert back to the factory
calibrated settings. Note that this only returns the factory settings of the
transmitter and not of the interchangeable probe (see section Restore
Probe RH Factory Calibration on page 34 and section Restore Probe T
Factory Calibration on page 35).
FRESTORE<cr>
Example:
>frestore
Restoring factory defaults...done
>
44 ___________________________________________________________________ M211244EN-B
Chapter 4 _______________________________________________________________ Service Port
Set/show Output Unit
Use the UNIT command for output unit selection (metric or non-metric).
UNIT [METRIC/NON_METRIC]<cr>
Example:
>unit
Unit
>
>unit non_metric
Unit
>
: METRIC
: NON_METRIC
VAISALA ________________________________________________________________________ 45
User's Guide _______________________________________________________________________
This page intentionally left blank.
46 ___________________________________________________________________ M211244EN-B
Chapter 5 _______________________________________________________________ Maintenance
CHAPTER 5
MAINTENANCE
This chapter provides information that is needed in basic maintenance of
HMT120.
Replacing the HUMICAP® Sensor
Fixed and Remote Probe Models
1.
2.
3.
4.
Remove the filter (plastic grid or sintered stainless steel).
Remove the damaged sensor and insert a new one.
Recalibrate the probe.
Replace a dirty filter to ensure a maximum lifetime and a fast
response for the sensor. Do not attempt to clean the filter.
VAISALA ________________________________________________________________________ 47
User's Guide _______________________________________________________________________
Removing and Fastening the Probe
Fixed Probe Model
Remove and replace the probe as follows:
1.
Loosen the metal locking bushing by carefully turning it counter
clockwise.
Remove the probe from the transmitter by pulling it gently
downwards.
Attach the new probe to the four pin M8 panel connector at the
transmitter (only one position possible).
Tighten the locking bushing to the M8 panel connector by turning
it clockwise.
2.
3.
4.
2
3
1
1011-153
Figure 14
Removing the Humidity Probe (Fixed Probe Model)
The following numbers refer to Figure 14 above:
1
2
3
=
=
=
Locking bushing
Holder bushing (attached permanently to the probe)
HMP110 probe
48 ___________________________________________________________________ M211244EN-B
Chapter 5 _______________________________________________________________ Maintenance
Remote Probe Model
1.
2.
Unscrew the small sleeve that secures the probe in place at the end
of the probe cable and pull out the probe.
Replace the probe and screw the small sleeve back on, securing the
probe tightly in place.
1
2
3
1011-154
Figure 15
Removing the Humidity Probe (Remote Probe Model)
The following numbers refer to Figure 15 above:
1
2
3
=
=
=
Probe cable
Sleeve securing the probe to the cable
HMP110 probe
VAISALA ________________________________________________________________________ 49
User's Guide _______________________________________________________________________
Calibration and Adjustment
Calibrate and adjust the HMT120 using the push-buttons on the
motherboard, serial line commands (see section Calibration Commands
on page 33), or with portable humidity meters HM70 or HMI41.
A calibrator kit is needed for calibration against saturated salt solutions.
The HMK15 Humidity Calibrator and pre-measured certified salts are
available from Vaisala. For further information, please contact your
Vaisala representative.
Vaisala Service Centers also offer accredited calibrations for humidity
and temperature. See contact information on page 69.
It is also possible to remove the HMP110 probe and replace it with a new
one. The old probe can be adjusted using another HMT120 transmitter
body, if you have one available.
NOTE
RH Field Calibration and Adjustment, as instructed in the following
pages, is restricted to a certain adjustment range to minimize the effects
of special circumstances, such as chemical contamination. In case the
probe is outside its adjustment/trim range due to, for example, chemical
exposure, the calibration cannot be completed. In this case, it is
recommended that you change the probe or contact Vaisala Services.
HMT120 Push-Button Calibration
1011-155
Figure 16
Adjustment Buttons
Calibration and adjustment of the HMT120 can be done by using the
adjustment buttons found at the transmitter. The two-point humidity
adjustment is carried out by using two relative humidity references: for
example saturated salt points 11 %RH (LiCl) and 75 %RH (NaCl). The
difference between the two humidity reference points must be at least
50 ___________________________________________________________________ M211244EN-B
Chapter 5 _______________________________________________________________ Maintenance
30 %RH. The difference between the two temperature reference points
must be at least 30 °C.
NOTE
In push-button calibration, the transmitter outputs are by default relative
humidity in the range 0…100% RH in CH1 and temperature in the range
-40 … +80 °C in CH2 regardless what the actual transmitter settings are.
Outputs mean in this case both the display and analog current outputs.
Humidity and Temperature Adjustment
To make a humidity or temperature adjustment (the same instructions
apply to both one-point and two-point calibration):
1.
2.
3.
NOTE
If you do not wish to perform the RH adjustment at this time, press ADJ
button one more time. The green indicator LED turns off and the red
indicator LED begins to blink slowly (800ms cycle time) to indicate T
calibration state. Now you can continue following the instructions from
step 7 onward.
4.
NOTE
Open the transmitter cover and you can see three buttons
marked ADJ, + and -. There are also two indicator LEDs, one
green and one red on the HMT120 motherboard.
Press the ADJ button and hold it down until the green indicator
LED begins to blink slowly (800ms cycle time).
HMT120 transmitter is now in RH calibration state. Analog output
and optional display will still follow the actual measured RH value.
Remove the filter and insert the probe into a measurement hole of
the dry end reference chamber (for example, LiCl: 11 %RH) to do
the low humidity offset adjustment.
Do not touch the adjustment buttons before the conditions have
stabilized. This takes approximately 30 minutes.
5.
Press either the - or + button at least once, make sure that the Iout
current is correct, adjust using the - and + buttons if needed, and
press the ADJ button again. The green indicator LED begins to
blink faster (400ms cycle time).
VAISALA ________________________________________________________________________ 51
User's Guide _______________________________________________________________________
NOTE
If you do not wish to perform the two-point RH adjustment at this time,
press the ADJ button one more time. The green indicator LED turns off
and the red indicator LED begins to blink slowly (800ms cycle time) to
indicate T calibration state. Now you can continue following the
instructions from step 7 onwards.
If one-point calibration is done at more than 50 %RH, a gain adjustment
is done instead of an offset adjustment.
NOTE
6.
Insert the probe into the high end reference chamber (for example,
NaCl: 75 %RH chamber in the humidity calibrator HMK15) and do
the high humidity gain adjustment by using the - and + buttons to
make sure the Iout current is correct (you have to press either - or +
at least once even if the value is correct). To finish the RH
calibration, press the ADJ button. The green LED is now turned off
and the red indicator LED begins to blink slowly (800ms cycle
time).
7.
HMT120 transmitter is now in T calibration state. Analog output
and optional display will still follow the actual measured T value.
If you do not wish to perform the T adjustment at this time, press ADJ
button one more time. The red indicator LED is turned off and the
transmitter returns to normal mode. The calibration procedure is now
finished.
8.
NOTE
Do not touch the adjustment buttons before the conditions have
stabilized.
9.
NOTE
Insert the probe into a known reference temperature (if HMK15
Humidity Calibrator is not used) and let the temperature reading
stabilize.
Using the - and + buttons, make the temperature offset adjustment
by making sure the Iout current is correct (you have to press either or + at least once even if the value is correct) and press the ADJ
button. The red indicator LED begins to blink faster (400ms cycle
time).
If you do not wish to perform the two-point T adjustment at this time,
press the ADJ button one more time. The red indicator LED is turned
off and the transmitter returns to normal mode. The calibration
procedure is now finished.
10.
Insert the probe into another reference temperature.
52 ___________________________________________________________________ M211244EN-B
Chapter 5 _______________________________________________________________ Maintenance
NOTE
Do not touch the adjustment buttons before the conditions have
stabilized.
11.
Using the - and + buttons, make the temperature gain adjustment
by making sure the Iout current is correct (you have to press either or + at least once even if the value is correct).
12.
Press the ADJ button one more time. The red indicator LED turns
off and the transmitter returns to normal mode. The calibration
procedure is now finished.
NOTE
In case of calibration error, both LEDs blink alternately at a very fast
rate (cycle time 200ms) for a period of 2s after which the transmitter
returns to normal mode.
NOTE
In case of using a HMT120 transmitter with display option, the
following texts are shown at the display during calibration:
"Probe cal: RH 1" corresponding the green LED blinking slowly
"Probe cal: RH 2" corresponding the green LED blinking fast
"Probe cal: T 1" corresponding the red LED blinking slowly
"Probe cal: T 2" corresponding the red LED blinking fast
"Probe cal: Error" corresponding both LEDs blinking alternately at
very fast rate
VAISALA ________________________________________________________________________ 53
User's Guide _______________________________________________________________________
Adjustment with HM70
You can check and adjust the HMT120 relative humidity measurement
with the HM70 Hand-Held Humidity and Temperature meter. A HM70connection cable is needed. Vaisala order code: 211339.
There are four types of adjustments available: field checking and
adjustment using a calibrated reference probe, one-point adjustment
using a calibrator, two-point adjustment using a calibrator, and LiClNaCl adjustment.
Follow the first seven steps and continue according to the chosen
adjustment method.
0505-351
Figure 17
1.
2.
3.
4.
5.
NOTE
Location of the MI70 Probe and Cable Connector
Ports
Connect the 211339 HM70-connection cable to the SERVICE PORT
connector on the HMT120 motherboard (see Figure 11 on page
21).
Connect the other end of the connection cable to either of the
HM70's connector ports located on the bottom of the indicator (see
Figure 17 above).
Turn on both devices (or just HM70, in case that HMT120 is on
continuously).
Check that the transmitter reading is shown on the indicator. The
reading of the transmitter is shown on the top or middle row of the
display, depending on which connector port the connection cable is
connected to.
Press the ADJ button on the HMT120 motherboard to open the
adjustment mode. Both LEDs on HMT120 motherboard remain in
OFF state and text "Starting adjustment mode for HMP110" is
shown at the MI70 display.
In case of using a HMT120 transmitter with display option, text "MI70
adjustment mode" is shown on the upper row of HMT120 display.
54 ___________________________________________________________________ M211244EN-B
Chapter 5 _______________________________________________________________ Maintenance
NOTE
From this point onward, the local adjustment buttons at HMT120 are
disabled and adjustment is carried out using the MI70 indicator.
HMT120 display and analog outputs will always follow the actual
measured RH/T value when in MI70 adjustment mode. When operating
the MI70, do not press the buttons too quickly or the calibration may
fail. Wait for one second between each press.
Press OK to start adjustment.
Check the environment settings if needed. Otherwise, press NO.
Select RH or T adjustment. Continue according to the directions of the
desired adjustment method.
6.
7.
Field Checking and Adjustment Using a Calibrated
Reference Probe
Follow steps 1 to 7 on page 54 and continue as follows:
8.
Check that the probes are located in equal conditions and wait
until the readings have stabilized. This may take 30 minutes or
more. If you are close to the probes, do not breath in their
direction.
9.
Press ADJUST to continue adjusting.
10.
Choose To same as RHI/II from the MI70 adjustment menu, press
SELECT (MI70 automatically recognizes which port the HMP70
series probe is connected to).
11.
Confirm the adjustment by pressing YES.
12.
The adjustment is done. Press BACK and EXIT to return to the
basic display.
13.
Turn off the MI70 and detach the connection cable.
One-Point Adjustment Using a Calibrator
When adjusting the transmitter in only one reference condition, please
take care that the reference condition represents the measuring
environment. MI70 indicator is used now only as a terminal for
visualizing and setting the transmitter's RH reading.
Follow steps 1 to 7 on page 54 and continue as follows:
8.
Remove the filter from the transmitter's probe and insert the
probe head into the reference condition.
9.
Press ADJUST to continue adjusting.
10.
Choose 1-point adjustment from the MI70 adjustment menu and
press SELECT.
VAISALA ________________________________________________________________________ 55
User's Guide _______________________________________________________________________
0505-185
Figure 18 Example of the MI70 Adjustment Menu
11.
Press READY when the reading has stabilized in the reference
condition. This may take 30 minutes or more. You can follow
the stabilization from the GRAPH display.
0505-186
Figure 19 Example of the MI70 Adjustment Mode Graph
Display
12.
Enter the correct reference value with the arrow buttons. Press
OK.
13.
Confirm the adjustment by pressing YES.
14.
The adjustment is done. Press BACK and EXIT to return to the
basic display.
15.
Turn off the MI70 and detach the connection cable.
Two-Point Adjustment Using a Calibrator
Note that the difference between the two reference humidities must be at
least 50 %. MI70 indicator is used now only as a terminal for visualizing
and setting the transmitter's RH reading.
Follow steps 1 to 7 on page 54 and continue as follows:
8.
Remove the filter from the transmitter's probe and insert the
probe head into the lower humidity reference condition.
9.
Press ADJUST to continue adjusting.
10.
Choose 2-point adjustment from the MI70 adjustment menu and
press SELECT.
11.
Press READY when the reading has stabilized in the first reference
condition (may take 30 minutes or more). You can follow the
stabilization from the GRAPH display.
12.
Enter the correct reference value in the first condition with the
arrow buttons. Press OK.
56 ___________________________________________________________________ M211244EN-B
Chapter 5 _______________________________________________________________ Maintenance
13.
Remove the probe from the first reference condition and insert
the probe head into the higher humidity reference condition.
14.
Press READY when the reading has stabilized in the second
reference condition (may take 30 minutes or more). You can
follow the stabilization from the GRAPH display.
15.
Enter the correct reference value in the second condition with
the arrow buttons. Press OK.
16.
Confirm the adjustment by pressing YES (by pressing NO you
return to adjustment mode display and no changes are made). If
the difference between the two reference conditions is less than
50 %RH, adjustment cannot be done.
17.
The adjustment is done. Press BACK and EXIT to return to the
basic display.
18.
Turn off the MI70 and detach the connection cable.
LiCl-NaCl Adjustment
This adjustment is done using relative humidity references 11.3 %RH
(LiCl) and 75.5 %RH (NaCl).
Follow steps 1 to 7 on page 54 and continue as follows:
8.
Remove the filter from the transmitter's probe and insert the
probe head into the LiCl salt chamber.
9.
Press ADJUST to continue adjusting.
10.
Choose LiCl-NaCl autom. from the MI70 adjustment menu and
press SELECT. Press OK to accept the note telling about
references.
11.
Press READY when the reading has stabilized in the LiCl salt
chamber (may take 30 minutes or more). You can follow the
stabilization from the GRAPH display.
12.
Remove the probe from the LiCl salt chamber and insert the
probe head into the NaCl salt chamber.
13.
Press READY when the reading has stabilized in the NaCl salt
chamber (may take 30 minutes or more). You can follow the
stabilization from the GRAPH display.
14.
Confirm the adjustment by pressing YES (by pressing NO you
return to adjustment mode display and no changes are made).
15.
The adjustment is done. Press BACK and EXIT to return to the
basic display.
16.
Turn off the MI70 and detach the connection cable.
VAISALA ________________________________________________________________________ 57
User's Guide _______________________________________________________________________
Temperature Field Check and Adjustment by Using a
Calibrated Reference Probe
Follow steps 1 to 7 on page 54 and continue as follows:
NOTE
8.
Check that the probes are located in equal conditions and wait
until the readings are stabilized (can take 30 minutes or more). If
you are close to the probes, do not breathe in their direction.
9.
Press ADJUST to continue adjusting.
10.
Press To same as TII/I, press SELECT. (MI70 always recognizes the
port to which the HMP70 series probe is connected).
11.
Confirm by pressing YES.
If the temperature difference between the reference probe and HMT120
is too large, the adjustment cannot be done (HM70 will notify you of
this). The available reserve for T adjustment of HMT120 depends on
the initial temperature calibration of the unit.
12.
Adjustment is done. Press BACK and EXIT to return to the basic
display.
13.
Switch off the MI70 and detach the calibration cable from MI70
and from the transmitter.
58 ___________________________________________________________________ M211244EN-B
Chapter 5 _______________________________________________________________ Maintenance
Adjustment with HMI41
You can check and adjust the HMT120 relative humidity measurement
with the HMI41 indicator and HMP41/45/46 probes. A HMI41connection cable is needed. Vaisala order code: 25917ZZ.
There are three adjustment modes available: offset (dry point), gain (wet
point), and two-point adjustment. All of these can be performed using the
HMI41 either as a reference meter (for example when the transmitter is
mounted in an air-conditioning channel) or only as a terminal for
visualizing and setting the transmitter's RH reading.
Offset and gain adjustments are performed the same way and differ only
in internal calculations. Select offset adjustment when the reference
humidity is < 65 %RH and gain adjustment when the reference humidity
is ≥ 65 %RH. Two-point adjustment is more accurate, and includes both
offset and gain corrections. For performing two-point adjustment, you
need two separate measurement points with a difference of at least 50
%RH between them.
Follow the general directions of connecting the HMI41 to the HMT120
and selecting the HMI41 calibrator function and then continue according
to the chosen adjustment method.
1
3
2
Figure 20
0505-187
Location of the HMI41 Calibration Connector
The following numbers refer to Figure 20 above:
1
2
3
=
=
=
HMI41 indicator
EXT connector
25917ZZ connection cable
VAISALA ________________________________________________________________________ 59
User's Guide _______________________________________________________________________
Connections and Selecting the Calibrator Function
1.
To select the calibrator function from the HMI41, press the ON/OFF
button until you can see some text on the display. Then release the
ON/OFF button and within 1 ... 2 seconds, press both ENTER and MODE
buttons until the following display appears:
2.
After a few seconds, the display changes to show the following:
°C
set
If the basic settings (display units, automatic power off function,
display quantities, and pressure) have to be changed, please refer to
the HMI41 Operating Manual. Otherwise, press ENTER repeatedly
until the following display appears:
set
To calibrate the HMT120, select number 3 with buttons ▲ (number
up) and ▼ (number down) and then press ENTER.
3.
Next the baud rate appears on the display. Use the baud rate 19200
(= 19.2 on the HMI41 display) with the HMT120 series. If the
baud rate on the HMI41 display is not correct, change it with
buttons ▲ and ▼. When the baud rate is correct, press ENTER, and
the serial communications settings display appears. The correct
settings for HMT120 series are: N, 8, 1. If needed, change the
settings with buttons ▲ and ▼ until they are correct, press ENTER,
and then ON/OFF.
These setting are stored in the HMI41 memory; when the HMI41 is
turned on again, it will automatically wake up as a calibrator for digital
transmitters with these serial line settings. After making these settings,
continue with the adjustment and follow the directions of the chosen
adjustment method.
60 ___________________________________________________________________ M211244EN-B
Chapter 5 _______________________________________________________________ Maintenance
Offset and Gain Adjustments
Offset and gain adjustments are performed in the same way (they differ
only in internal calculations), so this section is valid for both methods.
4.
5.
6.
Connect the 25917ZZ HMI41-connection cable to the SERVICE PORT
connector on the HMT120 motherboard (see Figure 11 on page
21).
Connect the other end of the connection cable to the EXT connector
located on the bottom of the HMI41 indicator (see Figure 20 on
page 59).
Turn on both devices. Wait until the following display appears:
RH
7.
Select the appropriate adjustment mode with the ▲ and ▼ buttons.
Select offset adjustment if the humidity is < 65 %RH and gain
adjustment if the humidity is ≥ 65 %RH:
RH
RH
or
Press ENTER to confirm the selection. A display similar to the
following appears:
RH
NOTE
%
In case of using a HMT120 transmitter with display option, the text
"HMI41 adjustment mode" is shown at the upper row of HMT120
display.
The next sections describe how to perform offset and gain adjustments in
two different ways.
VAISALA ________________________________________________________________________ 61
User's Guide _______________________________________________________________________
HMI41 as a Reference Meter
The HMI41 humidity probe is used to show the correct humidity value
(be sure that the reference probe has previously been adjusted). Connect
the cable and select the appropriate adjustment method as previously
explained, and continue according to the following instructions.
8.
A display similar to the one below should be visible:
RH
9.
Numbers on the first line indicate the transmitter reading, and the
numbers on the second line indicate the reference probe reading.
Let the readings stabilize (may take 30 minutes or more). If you
prefer, you can change the display to show the difference in the
readings. Press HOLD and a display similar to the following appears:
RH
10.
%
%
The numbers on the first line indicate how much the transmitter
reading differs from that of the HMI41 reference probe. The
numbers on the second line indicate the reference probe reading.
You can return to the previous display by pressing HOLD again.
When the readings have stabilized, press ENTER to conclude the
adjustment. When ENTER is pressed, the transmitter reading is
corrected to the reference probe reading. If the adjustment has been
succesful, the following display appears:
RH
11.
The data is now stored in the transmitter memory. If the adjustment
has not been succesful, the following display appears:
RH
12.
In this case, perform the adjustment again. Whether the adjustment
was succesful or not, the HMI41 always returns to display the
selected adjustment mode.
After succesfully completing the adjustment, turn off the HMI41
and disconnect the cable.
62 ___________________________________________________________________ M211244EN-B
Chapter 5 _______________________________________________________________ Maintenance
HMI41 as a Terminal
The HMI41 can also be used for visualizing and setting the transmitter's
RH reading manually.
8.
A display similar to the one below should be visible:
RH
%
The numbers on the first line indicate the transmitter reading,
and the numbers on the second line indicate the HMI41 probe
reading.
9.
Let the readings stabilize and press MODE. The following display
appears:
RH
%
set
The HMI41 now works only as a terminal for setting the
humidity reading. The numbers on the first line are blinking, and
the numbers on the second line indicate the transmitter reading.
10.
You can now set the blinking reading to the correct value (for
example, the equilibrium RH of a salt solution) with the buttons
▲ and ▼. Press ENTER to conclude the adjustment. If the
adjustment has been succesful, the following display appears:
RH
11.
The data is now stored in the transmitter memory. If the
adjustment has not been succesful, the following display
appears:
RH
In this case, perform the adjustment again. Whether the
adjustment was succesful or not, the HMI41 always returns to
display the selected adjustment mode.
12.
After succesfully completing the adjustment, turn off the HMI41
and disconnect the cable.
VAISALA ________________________________________________________________________ 63
User's Guide _______________________________________________________________________
Troubleshooting
Table 6 presents a summary of the error messages that may appear during
adjustment with the HMI41.
Table 6
Common Problems During Adjustment and Their
Remedies
Error Message
RH
Probable Cause
This message may
appear, for example, if
the difference between
the reference humidities
is too small (< 50 %RH).
This message may
appear during
adjustment when the
HMI41 is trying to
contact the transmitter.
The connection cable is
not properly connected
or the serial line settings
of the HMI41 and the
transmitter do not
correspond.
Remedy
Perform the adjustment
again.
Wait.
Check the connection of
the calibration cable.
Check that the serial line
settings in the HMI41
memory correspond to
those of the transmitter.
64 ___________________________________________________________________ M211244EN-B
Chapter 5 _______________________________________________________________ Maintenance
Analog Output Tests
HMT120 has a built-in software function for testing the analog outputs.
To test the outputs, do the following:
1.
2.
Make sure the transmitter is not in adjustment mode.
Press the + adjustment button (see Figure 16 on page 50).
This sets the output current level to the high point of the analog
output range (20mA nominal). The output stays at this level for
about 30 seconds after the + adjustment button has been pressed.
3.
Press the - adjustment button (see Figure 16 on page 50).
This sets the output current level to the low point of the analog
output range (4mA nominal). The output stays at this level for
about 30 seconds after the - adjustment button has been pressed.
HMT120 analog output current can be measured without removing the
wires from the screw-terminals by using a low-impedance multimeter
between the associated +-terminal and test point (CH1 or CH2) on the
component board, see figure 1011-157
Figure 21 below for reference.
1011-157
Figure 21
NOTE
HMT120 Output Current Measurement
In case of using a HMT120 transmitter with display option, the
following texts are shown at the display during analog output test:
"Analog output test high" corresponding to 20mA current output
"Analog output test low" corresponding to 4mA current output
VAISALA ________________________________________________________________________ 65
User's Guide _______________________________________________________________________
This page intentionally left blank.
66 ___________________________________________________________________ M211244EN-B
Chapter 6 ____________________________________________________________ Troubleshooting
CHAPTER 6
TROUBLESHOOTING
This chapter describes error messages and analog output error behavior,
troubleshooting for possible problems, and provides contact information
for technical support.
Error Codes
HMT120 software includes number of different self diagnostics, such as
flash and program memory checksum, probe communication status,
probe checksum, operation voltage check, oscillator fault check etc.
At startup software checks factory/user settings checksum, program
memory checksum and oscillator fault status. Other checks are made
during runtime. Available error codes are shown in the table below.
Table 7
Code
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Error Codes and Texts
Description
Probe T measurement error
Probe RH measurement error
Probe communication error
Probe checksum error
Probe message form error
Program's flash checksum error
Current settings checksum error (RAM)
Factory flash not initialised
User flash not initialised
Voltage is too low to operate correctly
Measurements not available
Oscillator fault bit active
Analog output quantity invalid
Display quantity invalid
Error Text
Probe T meas
Probe RA meas
Probe communication
Probe checksum
Probe message form
Program code checksum
Settings checksum
Factory defaults empty
User defaults empty
Voltage too low
Measurements not available
HW fault 1
Analog output quantity invalid
Display quantity invalid
Error text is shown by using the ERRS command via the serial interface.
In case of using a HMT120 transmitter with display option the error code
is shown at the display in format "ERR:Code-1[.Code-2][.Code-n]".
Multiple errors are separated with a dot between the error codes.
VAISALA ________________________________________________________________________ 67
User's Guide _______________________________________________________________________
Solving Typical Problems
You can check the error message via the serial interface by using the
ERRS command; see section Error Codes on page 67. In case of
constant error, please contact Vaisala Technical Support.
Table 8
Troubleshooting Table
Problem or Message
Measurement not working, any of
the following errors is active:
- Probe RH measurement error
- Probe T measurement error
Transmitter cannot communicate
with the probe, any of the
following errors is active:
- Probe communication error
- Probe checksum error
- Probe message form error
- Measurements not available
Serial line command not working,
outputs "Unknown command."
Cannot connect to serial line,
current serial settings of the
module are unknown.
Any of the following errors is
active:
- Current settings checksum error
- Default settings checksum error
Any of the following errors is
active:
- Program checksum error
- Factory flash defaults checksum
error
- Factory flash not initialized
- Oscillator fault bit active
Any of the following errors is
active:
- Analog output quantity invalid
- Display quantity invalid
Likely Causes and Solutions
- Sensor(s) damaged or missing. Open the
probe filter and check.
- Calibration is not done. Calibrate the probe.
- Check the supply voltage of the transmitter.
- Check the attachment of the probe to the
transmitter.
- In case of remote probe, check also the
interconnection cables.
- Replace the probe if necessary.
- Mistyped or unknown command, check the
command syntax and parameters.
Perform the following steps to connect:
1. Set your terminal settings to 19200 8 N 1
(the default settings of the transmitter).
2. Connect to the service port of the
transmitter.
2. Power up the transmitter, and type "Z" on
the serial line at least five times.
4. The transmitter will come online with the
default settings.
5. Use the SERI command to set the desired
serial settings, and use the SAVE
command to save them.
Internal error. Perform the following steps:
1. Reset or power cycle the module. Check if
the error disappears.
2. Return the module to factory settings using
the FRESTORE command. Check again.
3. If the error is still active, contact a Vaisala
service center.
Faulty transmitter, contact a Vaisala service
center.
In case of "Analog output quantity invalid"
error select the correct output quantities (set
with the CALCS command) with ASEL
command and in case of "Display quantity
invalid" error select the correct display
quantities with DSEL command.
68 ___________________________________________________________________ M211244EN-B
Chapter 6 ____________________________________________________________ Troubleshooting
Analog Output Error Notification
If the transmitter is unable to operate due to an error, the analog outputs
will be set to an error level.
Default output current in error state is 3.6mA. Error current value can be
changed via the serial interface by using the AERR command; see
section Set/show Analog Output Error Levels on page 38.
Technical Support
For technical questions, contact the Vaisala technical support via e-mail
at [email protected]
For contact information of Vaisala Service Centers, see
www.vaisala.com/servicecenters.
VAISALA ________________________________________________________________________ 69
User's Guide _______________________________________________________________________
This page intentionally left blank.
70 ___________________________________________________________________ M211244EN-B
Chapter 7 _____________________________________________________________ Technical Data
CHAPTER 7
TECHNICAL DATA
This chapter provides the technical data of the HMT120.
Table 9
Relative Humidity Measurement Specifications
Property
Measurement range
Accuracy (including non-linearity,
hysteresis, and repeatability):
at 0 ... +40 °C (+32 ... +104 °F)
Description / Value
0 ... 100 %RH
±1.5 %RH (0 ... 90 %RH)
±2.5 %RH (90 ... 100 %RH)
at -40 ... 0 °C and +40 ... +80 °C
(-40 ... +32 °F and +104...+176 °F) ±3.0 %RH (0 ... 90 %RH)
±4.0 %RH (90 ... 100 %RH)
Factory calibration uncertainty at
+20 °C (+68 °F)
±1.5 %RH
®
Humidity sensor
HUMICAP 180R
Table 10
Temperature Measurement Specifications
Property
Measurement range
Accuracy over temperature range:
at +15 ... +25 °C (+59 ... +77 °F)
at 0 …+15 °C and +25 …+40 °C
(+32 ... +59 °F and +77 ...+104 °F)
at -40 ... 0 °C and +40 ... +80 °C
(-40 ... +32 °F and +104...+176 °F)
Temperature sensor
Description / Value
-40 ... +80 °C (-40 ... +176 °F)
±0.2 °C (±0.36 °F)
±0.25 °C (±0.45 °F)
±0.4 °C (±0.72 °F)
Pt1000 RTD Class F0.1 IEC 60751
VAISALA ________________________________________________________________________ 71
User's Guide _______________________________________________________________________
Table 11
Operating Environment Specifications
Property
Operating temperature range
Transmitter body, no display
Transmitter body, with display
HMP110 probe
Storage temperature range
Electromagnetic compatibility
Description / Value
-40 ... +60 °C (-40 ... +140 °F)
-20 ... +60 °C (-4 ... +140 °F)
-40 ... +80 °C (-40 ... +176 °F)
-50 ... +70 °C (-58 ... +158 °F)
EN 61326-1:2006 Electrical
equipment for measurement,
control and laboratory use - EMC
requirements - Basic immunity test
requirements.
EN 55022:2006 + Am 1:2007
Information technology equipment Radio disturbance characteristics Limits and methods of
measurement. Class B.
Table 12
Inputs and Outputs
Property
Two-wire output signal
External loop voltage
Max. additional error caused by the
analog outputs after calibration at
+20 °C ambient temperature
Temperature dependence of the
analog outputs
Table 13
Description / Value
4 ... 20 mA (loop powered)
10 ... 30 VDC (RL = 0 ohms)
20 ... 30 VDC (RL < 500 ohms)
±0.1% of full scale output current
±0.005 %/°C full scale output
current
Mechanical Specifications
Property
Material
Transmitter housing
Display window
Probe body
Probe grid filter
Housing classification
Connections
Current loop outputs
Probe interface
Probe cable lengths
Display (optional)
Weight (Wall model, including probe)
Weight (10m cable model)
Description / Value
PBT plastic
PC plastic
Stainless steel (AISI 316)
Chrome coated ABS plastic
IP65 (NEMA 4)
Screw terminals 0.5 ... 1.5 mm²
4-pin M8 female panel connector
3 m, 5 m, 10 m, 20 m cables
can be cascaded up to 50 m
128x64 resolution full graphics
B&W display without backlight
270 g
540 g
72 ___________________________________________________________________ M211244EN-B
Chapter 7 _____________________________________________________________ Technical Data
Options and Accessories
Table 14
Options and Accessories
Description
HMP110 probe for HMT120
HMP110R replacement probe for
HMT120
HMP110T temperature only probe
for HMT120
Constant output probe
Humidity sensor
Probe mounting flange
Probe mounting clamp, 1 piece
Probe mounting clamp set, 10 pcs
Sensor protection
Plastic grid filter
Plastic grid with membrane filter
Stainless steel sintered filter
Probe cable 3 m
Probe cable 5 m
Probe cable 10 m
Probe cable 20 m
Radiation shield
Probe installation kit for DTR504
Rain shield with installation kit
Duct installation kit
HMI41 connection cable
HM70 connection cable
Service cable for PC, USB
Order Code
HMP110 – separate order form
HMP110R – separate order form
HMP110T – separate order form
HMP110REF – separate order form
Humicap180R
226061
225501
226067
DRW010522SP
DRW010525
HM46670SP
HMT120Z300
HMT120Z500
HMT120Z1000
HMT120Z2000
DTR504A
227777
215109
215619
25917ZZ
211339
219685
VAISALA ________________________________________________________________________ 73
User's Guide _______________________________________________________________________
Transmitter Dimensions
1011-158
Figure 22
Dimensions of the Fixed Probe Model in mm (inches)
74 ___________________________________________________________________ M211244EN-B
Chapter 7 _____________________________________________________________ Technical Data
1011-159
Figure 23
Dimensions of the Remote Probe Model in mm (inches)
VAISALA ________________________________________________________________________ 75
User's Guide _______________________________________________________________________
This page intentionally left blank.
76 ___________________________________________________________________ M211244EN-B
Appendix A _______________________________________________________ Calculation Formulas
APPENDIX A
CALCULATION FORMULAS
This appendix contains the formulas used for the calculated output
quantities.
HMT120 transmitter receives relative humidity and temperature from the
HMP110 probe. From these values dewpoint, frostpoint, absolute
humidity, mixing ratio, enthalpy, wet bulb temperature, saturation vapor
pressure and vapor pressure in normal pressure are calculated using the
following equations.
Symbols:
Td
Pw
Pws
RH
x
p
a
T
h
Tw
Tdf
=
=
=
=
=
=
=
=
=
=
=
Dewpoint temperature (°C)
Water vapor pressure (hPa)
Saturation vapor pressure (hPa)
Relative humidity (%)
Mixing ratio (g/kg)
Atmospheric pressure (hPa)
Absolute humidity (g/m3)
Temperature (°C)
Enthalpy (kJ/kg)
Wet bulb temperature (°C)
Dew/frostpoint temperature (°C)
VAISALA ________________________________________________________________________ 77
User's Guide _______________________________________________________________________
Dewpoint Temperature
The dewpoint temperature (Td) of a moist air sample is the temperature
to which the sample must be cooled to reach saturation with respect to
liquid water.
Dewpoint temperature is calculated using:
Td =
Tn
m
−1
 Pw 
log 
 A
[ C]

(1)
Pw is the water vapor pressure (see the equation below). The parameters
A, m, and Tn depend on temperature according to the following table:
T
A
6.119866
6.1078
5.9987
5.8493
6.2301
… 0 °C
0 ... 50 °C
50 ... 100 °C
100 ... 150 °C
150 ... °C
m
7.926104
7.5000
7.3313
7.2756
7.3033
Tn
250.4138
237.30
229.10
225.00
230.00
Dew/frostpoint Temperature
Dew/frostpoint temperature uses frostpoint calculation when the
dewpoint is below 0 °C. Frostpoint is the temperature at which the air is
saturated with respect to water vapor over an ice surface.
Td ≥ 0 → Tdf = Td
Td < 0 → Tdf =
Tn
m
P
log w
 A



−1
[ C]
(2)

Pw is the water vapor pressure (see the equation below). The parameters
A, m, and Tn depend on temperature according to the following table:
Td
… 0 °C
A
6.1134
m
9.7911
Tn
273.47
78 ___________________________________________________________________ M211244EN-B
Appendix A _______________________________________________________ Calculation Formulas
Mixing Ratio
The mixing ratio (mass of water vapour/mass of dry gas) is calculated
using:
x = B×
Pw
p-Pw
[g / kg ]
(3)
where:
B = 621.9907 g/kg
The value of B depends on the gas. 621.9907 g/kg is valid for air.
Absolute Humidity
Absoute humidity is defined as the mass of water vapour in a certain
volume. If ideal gas behaviour is assumed the absolute humidity can be
calculated using:
a =C⋅
Pw
(T + 273.15)
[g / m ]
3
(4)
where:
C = 216.679 gK/J
Enthalpy
Enthalpy is the sum of the internal energy of a thermodynamic system.
It can be calculated from mixing ratio using:
h = T ⋅ (1.01 + 0.00189 ⋅ x) + 2.5 ⋅ x
[kJ / kg ]
(5)
VAISALA ________________________________________________________________________ 79
User's Guide _______________________________________________________________________
Saturation Vapor Pressure
The saturation vapor pressure (Pws) is the equilibrium water vapor
pressure in a closed chamber containing liquid water. It is a function only
of temperature, and it indicates the maximum amount of water that can
exist in the vapor state.
The water vapor saturation pressure Pws is calculated by using two
equations (6 and 7):
3
Θ = T − ∑ Ci T i
i =o
[hPa ]
(6)
where
T
Ci
C0
C1
C2
C3
=
=
=
=
=
=
Temperature in K
coefficients
0.49313580
-0.46094296 * 10-2
0.13746454 * 10-4
-0.12743214 * 10-7
3
ln Pws = ∑ bi Θi + b4 ln Θ
(7)
i = −1
where
bi
b-1
b0
b1
b2
b3
b4
=
=
=
=
=
=
=
Coefficients
-0.58002206 * 104
0.13914993 * 101
-0.48640239 * 10-1
0.41764768 * 10-4
-0.14452093 * 10-7
6.5459673
80 ___________________________________________________________________ M211244EN-B
Appendix A _______________________________________________________ Calculation Formulas
Water Vapor Pressure
Vapor pressure refers to the vapor pressure of water in air or other gas.
Water vapor has a partial pressure Pw which is part of the total pressure
of the gas.
The water vapor pressure is calculated using:
Pw = RH ⋅
Pws
100
(8)
[hPa ]
Accuracies of Calculated Variables
Accuracies of the calculated variables depend on the calibration accuracy
of the humidity and temperature sensors; here the accuracies are given
for ± 2 %RH and ± 0.2 °C.
Accuracy of Dewpoint Temperature °C
Temp.
-40
-20
0
20
40
60
80
100
120
140
160
Relative humidity
10
20
30
1.86 1.03
0.76
2.18 1.19
0.88
2.51 1.37
1.00
2.87 1.56
1.13
3.24 1.76
1.27
3.60 1.96
1.42
4.01 2.18
1.58
4.42 2.41
1.74
4.86 2.66
1.92
5.31 2.91
2.10
5.80 3.18
2.30
40
0.63
0.72
0.81
0.92
1.03
1.14
1.27
1.40
1.54
1.69
1.85
50
0.55
0.62
0.70
0.79
0.88
0.97
1.08
1.19
1.31
1.44
1.57
60
0.50
0.56
0.63
0.70
0.78
0.86
0.95
1.05
1.16
1.26
1.38
70
0.46
0.51
0.57
0.64
0.71
0.78
0.86
0.95
1.04
1.14
1.24
80
0.43
0.48
0.53
0.59
0.65
0.72
0.79
0.87
0.96
1.05
1.14
90
—
—
0.50
0.55
0.61
0.67
0.74
0.81
0.89
0.97
1.06
100
—
—
0.48
0.53
0.58
0.64
0.70
0.76
0.84
0.91
0.99
Accuracy of Mixing Ratio g/kg (Ambient
Pressure 1013 mbar)
Temp.
-40
-20
0
20
40
60
80
100
120
Relative humidity
10
20
30
0.003 0.003 0.003
0.017 0.018 0.019
0.08 0.09
0.09
0.31 0.33
0.35
0.97 1.03
1.10
2.68 2.91
3.16
6.73 7.73
8.92
16.26 21.34 28.89
40.83 74.66 172.36
40
0.003
0.021
0.10
0.37
1.17
3.43
10.34
40.75
—
50
0.003
0.022
0.10
0.39
1.24
3.72
12.05
60.86
—
60
0.004
0.023
0.11
0.41
1.31
4.04
14.14
98.85
—
70
0.004
0.025
0.11
0.43
1.38
4.38
16.71
183.66
—
80
0.004
0.026
0.12
0.45
1.46
4.75
19.92
438.56
—
90
—
—
0.13
0.47
1.54
5.15
24.01
—
—
100
—
—
0.13
0.49
1.62
5.58
29.29
—
—
VAISALA ________________________________________________________________________ 81
User's Guide _______________________________________________________________________
Accuracy of Wet Bulb Temperature °C
Temp.
-40
-20
0
20
40
60
80
100
120
140
160
Relative humidity
10
20
30
0.20 0.20
0.20
0.21 0.21
0.22
0.27 0.28
0.28
0.45 0.45
0.45
0.84 0.77
0.72
1.45 1.20
1.03
2.23 1.64
1.32
3.06 2.04
1.58
3.85 2.40
1.81
4.57 2.73
2.03
5.25 3.06
2.25
40
0.20
0.22
0.29
0.44
0.67
0.91
1.13
1.31
1.48
1.65
1.82
50
0.20
0.22
0.29
0.44
0.64
0.83
0.99
1.14
1.28
1.41
1.55
60
0.20
0.22
0.29
0.44
0.61
0.76
0.89
1.01
1.13
1.25
1.37
70
0.20
0.23
0.30
0.43
0.58
0.71
0.82
0.92
1.03
1.13
1.24
80
0.20
0.23
0.30
0.43
0.56
0.67
0.76
0.85
0.95
1.04
1.13
90
—
—
0.31
0.42
0.54
0.63
0.72
0.80
0.88
0.97
1.05
100
—
—
0.31
0.42
0.52
0.60
0.68
0.75
0.83
0.91
0.99
Accuracy of Absolute Humidity g/m³
Temp.
-40
-20
0
20
40
60
80
100
120
140
160
Relative humidity
10
20
30
0.004 0.004 0.005
0.023 0.025 0.027
0.10 0.11
0.12
0.37 0.39
0.41
1.08 1.13
1.18
2.73 2.84
2.95
6.08 6.30
6.51
12.2 12.6
13.0
22.6 23.3
23.9
39.1 40.0
41.0
63.5 64.9
66.4
40
0.005
0.029
0.13
0.43
1.24
3.07
6.73
13.4
24.6
42.0
67.8
50
0.005
0.031
0.13
0.45
1.29
3.18
6.95
13.8
25.2
43.0
69.2
60
0.006
0.032
0.14
0.47
1.34
3.29
7.17
14.2
25.8
44.0
70.7
70
0.006
0.034
0.15
0.49
1.39
3.40
7.39
14.6
26.5
45.0
72.1
80
0.006
0.036
0.15
0.51
1.44
3.52
7.61
15.0
27.1
45.9
73.5
90
—
—
0.16
0.53
1.49
3.63
7.83
15.3
27.8
46.9
74.9
100
—
—
0.17
0.55
1.54
3.74
8.05
15.7
28.4
47.9
76.4
82 ___________________________________________________________________ M211244EN-B
Appendix A ___________________________________________________________________ INDEX
INDEX
A
Accessories
Active Errors
Display
Analog Output
Calibrate
Configuration
Analog Output Error Levels
Set
Show
Analog Output Error Notification
Analog Output Quantity and Scaling
Set
Show
Analog Output Status
Show
Analog Outputs
Test
10, 73
43
65
35
38
38
38
69
38
38
30
40
C
Calibration Commands
Calibration Information
Set
Show
Command List
Display
Commands
Other
Component Board
Components
Connections
Continuous Outputting
Start
Stop
33
29
29
43
41
21
12
21
31
32
D
Device Information
Displayed Quantities
Set
Show
27
41
41
E
Environmental Parameters
Set
Show
Error Codes
37
37
67
F
Factory Settings
Restoring
44
Firmware Version
Show
Fixed and Remote Probe Models
31
10
H
HM70
6, 50, 54, 58, 73
HMI41
6, 50, 59, 60, 61, 62, 63, 64, 73
HMT120
Adjustment
50
Calibration
50
Dimensions
74
Introduction
9
Reset
44
HMT120H
9
HMT120T
9
®
HUMICAP
Replacing
47
Humidity and Temperature Transmitter
Introduction
9
Humidity Measurement
Calibrate
33
I
Installation
Duct
Opening
Radiation Shield
Rain Shield
Wall mounting
Interchangeable Probe
17
13
16
15
14
10
L
LCD display
10, 21
M
Measurement Parameters
Configuration
37
O
Options
Output Formatting
Set
Show
Output Interval
Set
Show
Output quantities
Output Unit
Set
Show
10, 12, 73
42
42
32
32
9
45
45
VAISALA ________________________________________________________________________ 83
User's Guide _______________________________________________________________________
P
Probe Mounting Clamp
Probe Mounting Flange
Probe RH
Restore Factory Calibration
Probe T
Restore Factory Calibration
PuTTY
20
19
34
35
24
Q
Quantity
Set
Show available
28
28
R
Radiation Shield
Rain Shield
Reading Output
Once
16
15
32
S
Safety
Serial Commands
Serial Interface Mode
Set
Show
Serial Line Operation
Configuration
7
26
37
37
36
Serial Line Output Commands
Serial Line Settings
Set
Show
Service Port
Settings
Restoring
Saving
System Information
Show
31
36
36
23
44
43
31
T
Technical Support
Temperature Measurement
Calibrate
Terminal Application Settings
Terminal Echo
Set
Show
Transmitter
Reset
69
34
24
36
36
44
U
USB Cable
Driver installation
23
W
Warranty
8
84 ___________________________________________________________________ M211244EN-B
www.vaisala.com
*M211244EN*
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement