RKI Instruments M2A Operator's Manual

M2 Transmitter

Operator’s Manual

Part Number: 71-0107RK

Revision: D

Released: 10/7/10

RKI Instruments, Inc.

www.rkiinstruments.com

WARNING

Read and understand this instruction manual before operating instrument. Improper use of the gas monitor could result in bodily harm or death.

Periodic calibration and maintenance of the gas monitor is essential for proper operation and correct readings. Please calibrate and maintain this instrument regularly! Frequency of calibration depends upon the type of use you have and the sensor types. Typical calibration frequencies for most applications are between 3 and 6 months, but can be required more often or less often based on your usage.

M2 Transmitter Operator’s Manual

Product Warranty

RKI Instruments, Inc. warrants gas alarm equipment sold by us to be free from defects in materials, workmanship, and performance for a period of one year from date of shipment from RKI Instruments, Inc. Any parts found defective within that period will be repaired or replaced, at our option, free of charge. This warranty does not apply to those items which by their nature are subject to deterioration or consumption in normal service, and which must be cleaned, repaired, or replaced on a routine basis. Examples of such items are: a) Absorbent cartridges b) Pump diaphragms and valves c) Fuses d) Batteries e) Filter elements

Warranty is voided by abuse including mechanical damage, alteration, rough handling, or repair procedures not in accordance with the operator’s manual. This warranty indicates the full extent of our liability, and we are not responsible for removal or replacement costs, local repair costs, transportation costs, or contingent expenses incurred without our prior approval.

THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER

WARRANTIES AND REPRESENTATIONS, EXPRESSED OR IMPLIED,

AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF

RKI INSTRUMENTS, INC. INCLUDING BUT NOT LIMITED TO, THE

WARRANTY OF MERCHANTABILITY OR FITNESS FOR A

PARTICULAR PURPOSE. IN NO EVENT SHALL RKI INSTRUMENTS,

INC. BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL

LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF

ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR

OPERATE PROPERLY.

This warranty covers instruments and parts sold to users by authorized distributors, dealers, and representatives as appointed by RKI Instruments, Inc.

We do not assume indemnification for any accident or damage caused by the operation of this gas monitor, and our warranty is limited to the replacement of parts or our complete goods.


Table of Contents

Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

About the M2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

External Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Internal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Chapter 3: Installation & Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Mounting the M2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Wiring the M2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Chapter 4: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Information Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4 - 20 mA Signal Output Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Chapter 5: Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Viewing & Changing M2 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Chapter 6: Gas Type Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Selecting the Gas Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33


Chapter 7: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Calibration, Combustible Gas, CO

2

, and Toxic Versions . . . . . . . . . . . . . . . . . . . . . 40

Calibration, Oxygen Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Replacing Components of the M2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Chapter 8: RS-485 Modbus Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Wiring the M2 in a Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Using the M2 in a 4-wire Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Modbus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Supported Modbus Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Appendix A: Control Button Quick Reference Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Appendix B: Function Code 16 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

(Appendix B available from RKI Instruments, Inc. Not included in manual as normally provided with M2 detector head.)


Chapter 1: Introduction

Overview

This chapter briefly describes the M2 Transmitter. This chapter also describes the M2

Transmitter Operator’s Manual (this document). Table 1 at the end of this chapter lists the specifications for the M2.

About the M2 Transmitter

The M2 transmitter is a fixed mount, continuous-monitoring detector head. All user adjustable parameters may be accessed using push button switches. In addition, calibration may be performed non-intrusively by use of a magnetic wand accessory which activates magnetic switches through a window at the front face of the detector head.

The M2 displays the current gas reading on an LCD display which is visible through the window in the cover (front face) and provides a 4 - 20 mA signal which indicates the target gas reading for use by a gas monitoring controller, recording device, or programmable controller. The M2 also provides an RS-485 Modbus output. Three sets of relay contacts, two controlled by the gas alarms and one by the fail alarm, rated at 115

VAC 5 amps are available for controlling devices such as lights or horns or for controlling higher rated relays.

Four operating modes allow you to display and change setup and calibration settings and change the gas type. They are Calibration Mode, Configuration Mode, Gas Type Mode, and Modbus Mode.

About this Manual

The M2 Transmitter Operator’s Manual uses the following conventions for notes, cautions, and warnings.

NOTE: Describes additional or critical information.

CAUTION: Describes potential damage to equipment.

WARNING: Describes potential danger that can result in injury or death.

1 M2 Transmitter Operator’s Manual

Specifications

Target Gas/Detection

Range

Alarm Settings

Table 1 lists specifications for the M2.

Table 1: M2 Specifications

(Alarm 1/Alarm 2)

Combustible Gas/Carbon Dioxide (CO

2

)

• Catalytic LEL: 0 - 100% LEL, 1% LEL increments (CH

4 unless otherwise specified. H

2

calibration

specific detector available)

• IR (infrared) CH

4

LEL: 0 - 100% LEL, 1% LEL increments

• IR HC LEL: 0 - 100% LEL, 1% LEL increments (propane calibration)

• IR CH

4

Volume: 0 - 100 % volume, 1% increments

• IR CO

2

ppm: 0 - 5,000 ppm, 20 ppm increments

• IR CO

2

Volume: 0 - 5.00 % volume, 0.01% increments

• IR CO

2

Volume: 0 - 50.0 % volume, 0.1% increments

• IR CO

2

Volume: 0 - 100 % volume, 1% increments

Oxygen

• Oxygen (O

2

): 0 - 25.0 % volume, 0.1% increments

CO/H

2

S

• Carbon Monoxide (CO): 0 - 300 ppm, 1 ppm increments

• Hydrogen Sulfide (H

2

S): 0 - 100 ppm, 1 ppm increments

ESM-01 Toxic

• Ammonia (NH

3

): 0 - 75.0 ppm, 0.1 ppm increments

• Arsine (AsH

3


• Chlorine (Cl

2


• Hydrogen Cyanide (HCN): 0 - 15.0 ppm, 0.1 ppm increments

• Phosphine (PH

3


• Sulphur Dioxide (SO

2


Combustible Gas (%LEL): 10 %LEL/50 %LEL

Combustible Gas (%Volume): 100 %/100 %

CO2 0 - 5,000 ppm: 2,500 ppm/5,000 ppm

CO2 0 - 5.00%: 0.50 %/3.00 %

CO2 0 - 50.0%: 50.0%/50.0%

CO2 0 - 100%: 100%/100%

Oxygen: 19.5%(decreasing)/23.5%(increasing)

Carbon Monoxide: 25 ppm/50 ppm

Hydrogen Sulfide: 10 ppm/50 ppm

Ammonia: 12 ppm/25 ppm

Arsine: 0.20 ppm/0.50ppm

Chlorine: 0.50 ppm/1.50 ppm

Hydrogen Cyanide: 5.0 ppm/10.0 ppm

Phosphine: 0.10 ppm/0.30 ppm

Sulphur Dioxide: 1.00 ppm/2.00 ppm

Explosion-proof Junction Box, NEMA 4 Construction

(housing)

Area Classification Explosion-proof for Class I, Groups B, C, and D (Combustible, CO

Type CO and H

2

S, and CSA Type oxygen)

2

, CSA

M2 Transmitter Operator’s Manual 2

Table 1: M2 Specifications

Sampling Method

Input Power

Controls

Diffusion

19 - 30 VDC

• Three push button switches

• Three magnetic switches for non-intrusive calibration

Weight

Signal Output

4.5 lbs.

• 4 to 20 mA, 500 ohms impedance max

• RS-485 Modbus

Operating

Temperature

• ESM-01 Type: -10°C to 40 °C

• All Others: -20°C to 50°C

± 5% of full scale Accuracy

*

These are the RKI factory settings. You can change the alarm settings in Configuration Mode. See

“Viewing & Changing M2 Parameters” on page 30.

WARNING: When using the M2, you must follow the instructions and warnings in this manual to assure proper and safe operation of the M2 and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the M2 as described in this manual.


Chapter 2: Description

Overview

This chapter describes external and internal components of the M2 Transmitter.

External Description

This section describes the junction box and all external components of the M2 transmitter.

Junction Box

Cover

Mounting Hole (2)

3/4 NPT

Conduit Hub Magnetic

Wand

Window

Detector

(Catalytic LEL Detector Shown)

Figure 1: M2 External Components

Junction Box

The M2’s cast aluminum junction box is dust and weather resistant. The junction box also protects the M2 and all connections made to it. Use the two 3/4 in. conduit hubs to mount the detector to the junction box (factory installed in the bottom hub) and connect wiring from an external device (top hub).

Use the junction box’s two mounting holes to mount the M2 to a vertical surface at the monitoring site. The window in the cover on the front of the junction box allows you to view the LCD display and use the magnetic wand to actuate the magnetic control switches so you can perform non-intrusive calibration. Removing the cover allows you to access the interior of the junction box.


5

Magnetic Wand

The magnetic wand is a short plastic rod with a magnet in one end. It is used to actuate the magnetic control switches on the control PCB while the junction box cover is still installed so that non-intrusive calibration can be performed.

Gas Detector

The gas detector senses the target gas and is mounted in a 3/4” conduit hub on the right bottom side of the M2. A variety of detectors may be used with the M2. Table 2 below lists the detectors that can be used with the M2.

Table 2: M2 Detectors

Target Gas, Range

Combustible Gas, 0 - 100% LEL

Hydrogen, 0 - 100% LEL

CH

4

, 0 - 100% LEL

HC, 0 - 100% LEL (cal. to propane)

CH

4

, 0 - 100% volume

CO

2

, 0 - 5,000 ppm

CO

2

, 0 - 5%

CO

2

, 0 - 50%

CO

2

, 0 - 100%

Oxygen, 0 - 25%

CO, 0 - 300 ppm

H

2

S, 0 - 100 ppm

NH

3

, 0 - 75 ppm

AsH

3

, 0 - 1.5 ppm

CL

2

, 0 - 3 ppm

PH

3

, 0 - 1 ppm

SO

2

, 0 - 6 ppm

Detector(s) Used

• 61-0140RK (Catalytic UL version)

• 61-0140RK-05 (Catalytic CSA version)

• NC-6205-01 (Catalytic UL version, hydrogen specific)

• NC-6205-05 (Catalytic CSA version, hydrogen specific)

• 61-0190RK-CH4 (IR UL)

• 61-0190RK-HC (IR UL)

• 61-0192RK-CH4 (IR UL)

• 61-0191RK-02 (IR UL)

• 61-0198RK-02 (IR)

• 61-0191RK-03 (IR UL)

• 61-0198RK-03 (IR)

• 61-0191RK-05 (IR UL)

• 61-0198RK-05 (IR)

• 61-0191RK-10 (IR UL)

• 61-0198RK-10 (IR)

• 65-2494RK (capillary)

• 65-2510RK (partial pressure)

• 65-2511RK (capillary)

• 65-2514RK (capillary, CSA)

• 65-2433RK-05 (CSA)

• 65-2496RK

• 65-2423RK-05 (CSA)

• 65-2495RK

• 65-2300RK-NH3

• 65-2300RK-ASH3

• 65-2300RK-CL2

• 65-2300RK-PH3

• 65-2300RK-SO2


The catalytic LEL detectors have a 1/2” NPT thread and require a 3/4”NPT x 1/2”NPT reducer to install in the detector hub. The rest of the detectors have a 3/4” NPT mounting thread and are installed directly in the detector hub.

The IR combustible detectors are generally used instead of the catalytic combustible detectors in applications where there may be catalyst poisons such as silicone present or where oxygen is not present in the monitoring environment.

Some of the detectors have a replaceable plug-in sensor. These detectors are described and illustrated below.

There are four types of oxygen detectors available, a non-explosion proof partial pressure type, a non-explosion proof capillary type, a non-explosion proof capillary type with a replaceable sensor, and an explosion proof (CSA) capillary type with a replaceable sensor.

The capillary type’s output is less susceptible to variations in atmospheric pressure than the partial pressure type. The CSA type oxygen detector (65-2514RK) and one of the nonexplosion proof capillary type detectors (65-2494RK) have a replaceable plug-in sensor inside the detector housing while the entire oxygen detector must be removed if replacement is required for the other two.

Detector Housing Body

Cap Gasket

Oxygen Sensor

Detector Housing Cap

Flame Arrestor

Guard

Figure 2: 65-2514RK Oxygen Detector, CSA



Cap Gasket

Plug-In Oxygen Sensor

Detector Housing Cap

Hydrophobic Membrane

7

Figure 3: 65-2494RK Oxygen Detector, Non-Explosion Proof, Capillary Type

Both types of CO and H

2

S detectors have replaceable plug-in sensors inside the detector housing. The CO detector includes a charcoal filter disk which is held onto the sensor with a rubber retaining boot. The charcoal filter disk scrubs out interfering gases to which the

CO sensor responds such as H

2

S and certain hydrocarbons.

Detector Housing

Cap Gasket

CO Sensor

Rubber Boot w/Charcoal Filter Disk

Detector Housing

Cap

Figure 4: 65-2433RK-05 CO Detector, CSA



Cap Gasket

CO Plug-in Sensor

Charcoal Filter w/Rubber Boot

Detector

Housing Cap

Hydrophobic

Membrane

Figure 5: 65-2496RK CO Detector Non-Explosion Proof

Detector Housing

Cap Gasket

H2S Sensor

Detector Housing

Cap

Figure 6: 65-2423RK-05 H

2

S Detector, CSA


9


Cap Gasket

H2S Plug-in Sensor

Detector

Housing Cap

Hydrophobic

Membrane

Figure 7: 65-2495RK H

2

S Detector Non-Explosion Proof

The construction of the various ESM-01 detectors is similar. Each of the ESM-01 detectors has a different replaceable plug-in sensor that protrudes through the detector housing cap. Although ESM-01 detectors look the same except for the plug-in detector, the detector housing which includes the detector socket and conditioning circuitry is specific to a sensor type. For example, a detector housing from a Cl

2

detector cannot be used with an

NH

3

detector. One of the two detector wires is color coded for each specific detector type.

The ESM-01 detectors include a removable splashguard that screws onto the detector housing cap. When it is necessary to apply gas to an ESM-01 detector, remove the splashguard to allow access to the sensor that protrudes through the detector housing cap.

You can then push the appropriate ESM-01 calibration cup onto the sensor.


(different for each detector type)

Cap Gasket

Sensor

(different for each detector type)

Detector Housing

Cap

Splash Guard

(removable)

Figure 8: ESM-01 Type Detector


Internal Description

This section describes the internal components of the M2. The internal components of the

M2 include the terminal PCB which provides for all the wiring connections to the M2 and the control PCB which displays the gas reading and has the control buttons.

3/4" NPT Conduit Opening

Power/Signal

For Wire Entry

Terminal Strip

Detector Terminal Strip

(Comb/CO

2

Version Shown)

Detector Current Pot

(Comb/CO

2

Type Only,

Factory Adjust)

Relay

Terminal

Strips

Junction Box

Terminal PCB

Control PCB

Magnetic

Switches

ENTER

DOWN/NO

UP/YES

Fail LED

Alarm 1 LED

Alarm 2 LED

RX LED

TX LED

RKI INSTRUMENTS

M2 TRANSMITTER

Programming

Connector

(Factory Use)

Modbus

Terminal Strip

Push Button

Control Switches

UP/YES

DOWN/NO

ENTER

Display Ribbon

Cable Connector

Termination

Jumper

LCD Display

View With Cover and Control

PCB Removed

View with Cover Removed

Figure 9: M2 Internal Components

Terminal PCB

The terminal PCB is encapsulated in epoxy for protection against moisture and physical damage. It is mounted into the rear of the junction box with three standoffs and rests on a thin layer of foam. A banana jack is screwed into each of the standoffs and used for mounting the control PCB. The terminal PCB converts the electrical output from the detector to a signal which can be displayed by the LCD display, a 4 - 20 mA signal (that is proportional to the detection range), and an RS-485 Modbus output signal. The 4 - 20 mA signal may be used by a recording device, gas monitor controller, or programmable controller. The Modbus output may be used to connect the M2 to a Modbus network. The terminal PCB also controls three relays, one fail and two gas alarm relays.

Two columns of plug-in style terminal strips are used to make all wiring connections to the M2. The column on the left consists of the power/signal, detector, and Modbus terminal strips. The column on the right consists of the relay terminal strips. A 20 position


connector at the bottom of the terminal PCB is used to connect the terminal PCB to the control PCB with a ribbon cable. A 5 position connector on the left side of the terminal

PCB is used by factory or field service personnel to program the M2. On the combustible and CO

2

versions of the M2, a factory adjust pot just above the programming connector is used to set the detector current.

Power/Signal Terminal Strip

The power/signal terminal strip is a three position plug-in style terminal strip located at the top of the left terminal column. It is used to connect 24 VDC power to the M2 and to connect the 4 - 20 mA output signal to a device.

The signal output, the S terminal, does not have to be connected for the M2 to function.

The S terminal is used if you want to connect the 4 - 20 mA output signal to another device such as a gas monitoring controller, chart recorder, or programmable controller (PLC).

Detector Terminal Strip

Comb/CO

2

The detector terminal strip is a four position plug-in style terminal strip and is the middle terminal strip in the left terminal column. For a combustible or CO

2

M2, all four terminals are used to connect the detector to the M2. For a toxic or oxygen M2, only two of the terminals are used for connecting a detector: two terminals are dedicated for connecting a toxic detector and two are dedicated for connecting an oxygen detector (only one detector can be installed).

Detector

Terminal Strip

Oxy/Toxic Detector

Terminal Strip

11

Figure 10: Detector Terminal Strip

NOTE: The detector is factory-wired to the M2. See “Wiring the M2 Transmitter” on page 18 for all wiring procedures related to M2.

Modbus Terminal Strip

The Modbus terminal strip is a three position plug-in style terminal strip and is the bottom terminal strip in the left terminal column. It allows connection of the M2 into a

Modbus network.


Relay Terminal Strips

The right column of terminal strips consists of, from top to bottom, the fail, alarm 1, and alarm 2 relay terminal strips. They are three-position plug-in style terminal strips. The relay terminal strips are used to connect devices such as lights and horns that are controlled by the relay contacts. The relay contacts are rated at 115 VAC, 5 amps. The relay contacts may also be used to control higher rated relays.

Termination Jumper

A two pin header with a termination jumper installed is located below the Modbus terminal strip. The jumper has no function unless the M2 is wired into a Modbus installation. See “Chapter 8: RS-485 Modbus Output” on page 50 for a description of using the M2 in a Modbus system.

Control PCB

The LCD display and control switches are located on the control PCB. It is installed on top of the terminal PCB by lining up its three spacing standoffs with the banana jacks in the terminal PCB mounting standoffs and pushing it onto the banana jacks. The jacks retain the control PCB.

LCD Display

The LCD display is located at the top of the control PCB. It indicates the current gas reading and displays messages and parameters in the M2’s programs.

Control Buttons

The M2 includes three push button switches that allow you to enter the M2’s operating modes, navigate through the modes, update settings, and save changes to the settings.

The push button switches are located along the bottom edge of the control PCB (see

Figure 9). The UP/YES button is on the left, the DOWN/NO button is in the middle, and the ENTER button is on the right.

Table 3: M2 Control Button Functions

Switch

UP (YES)

DOWN (NO)

ENTER

Function

• Saves settings

• Changes the displayed setting

• Enters the Calibration Program

• Enters Gas Type Mode (press with DOWN/NO button)

• Enters Configuration Mode (press with ENTER button)

• Cancels setting changes

• Changes the displayed setting

• Enters Gas Type Mode (press with UP/YES button)

• Enters Modbus Mode (press with ENTER button)

• Displays the Information Screen

• Initiates operations

• Enters Configuration Mode (press with UP/YES button)

• Enters Modbus Mode (press with DOWN/NO button)

• Functions as an alarm reset switch

Just above each push button switch is a magnetic switch with the same function as the push button switch below it. The magnetic switches are for use in non-intrusive calibration. They are actuated by bringing the magnetic wand close enough to them to


actuate them. Although the magnetic switches have the same functions as the push button switches, it is not practical to use them for operations other than calibration because it is not possible to actuate two magnetic switches at once with only one magnetic wand. Since displaying the Information Screen only requires the use of one switch, the wand may be used to show the Information Screen (see “Information Screen” on page 25).

Status LEDs

The M2 includes five status LEDs that are located above the display (see Figure 9).

• Fail LED

The fail LED turns on when the M2 is experiencing a fail condition. A fail condition can be caused by a detector failure or low detector signal.

• Alarm 1 LED

The alarm 1 LED is on when the M2 is experiencing an alarm 1 condition.

• Alarm 2 LED

The alarm 2 LED is on when the M2 is experiencing an alarm 2 condition.

• RX & TX LED’s

These LED’s indicate data being received (RX) and transmitted (TX) when the M2’s

Modbus output is operating.


Chapter 3: Installation & Startup

Overview

This chapter describes procedures to mount the M2 Transmitter in the monitoring environment and wire it to input power and devices.

Mounting the M2 Transmitter

1.

Select a mounting site that is representative of the monitoring environment. Consider the following when you select the mounting site.

• Select a site where the M2 is not likely to be bumped or disturbed. Make sure there is sufficient room to perform start-up, maintenance, and calibration procedures.

• Select a site where the target gas is likely to be found first. For lighter gases, mount the detector near the ceiling; for heavier gases, mount the detector near the floor.

2.

At the monitoring site, use #10 screws through the junction box’s two mounting holes to secure the junction box to a vertical surface. Figure 11 - Figure 17 show the outline and mounting dimensions for each version of the M2. Mount the M2 with the detector facing down as shown in the following figures.

4.60

2.75

5.20

.25 Dia. Mounting

Hole, 2X

3/4 NPT Conduit

Hub

6.10

5.46

7.7 max

1.10

1 1/2-20 For

Calibration Cup

Figure 11: Outline & Mounting Dimensions, Catalytic LEL

2.3 max


3.94

2.75

5.2

.25 Dia. Mounting

Hole, 2X

3/4 NPT Conduit

Hub

5.46

6.1

7.3 max

1.1

1.9 max

IR Detector

Figure 12: Outline & Mounting Dimensions, IR Combustible & CO

2

4.60

2.75

5.20

.25 Dia. Mounting

Hole, 2X

3/4 NPT Conduit

Hub

6.10

5.46

8.1 max

1.10

1 1/2-20 For

Calibration Cup

2.6 max

Figure 13: Outline & Mounting Dimensions, Oxygen, Partial Pressure Type


4.60

2.75

5.20

.25 Dia. Mounting

Hole, 2X

3/4 NPT Conduit

Hub

6.10

5.46

6.8 max

1.10

1 1/2-20 For

Calibration Cup

1.4 max

Figure 14: Outline & Mounting Dimensions, Oxygen, Capillary Type

5.2

4.60

2.75

Ø .25 Mouting Holes (2X)

3/4 Conduit Hub

6.1

5.46

7.0 max

1.50 max

1 1/2-20 For

Calibration Cup

1.1

Figure 15: Outline & Mounting Dimensions, Replaceable Sensor, Non Explosion Proof,

H

2

S, CO, and Oxygen


4.60

2.75

5.20

.25 Dia. Mounting

Hole, 2X

3/4 NPT Conduit

Hub

6.10

5.46

8.5 max

1.10

3.2

max

1 1/2-20 For

Calibration Cup

Figure 16: Outline & Mounting Dimensions, CSA Type H

2

S, CO, and Oxygen

5.2

Ø .25 Mouting Holes (2X)

4.60

2.75

3/4 Conduit Hub

5.46

6.1

4.37 max

9.82 max

1.1

17

Figure 17: Outline & Mounting Dimensions, ESM-01 Toxic


Wiring the M2 Transmitter

WARNING: Always verify that the power source is OFF before making any wiring connections.

1.

Remove the junction box cover.

2.

Grasp the control PCB by its edges.

3.

Gently pull until the control PCB is pulled away from the banana jacks. Take care not to pull too hard and damage the cable which connects the control and terminal PCB’s.

4.

Let the control PCB hang by the cable. The terminal strips are now visible on the terminal PCB. The control PCB may be left hanging while wiring is done. If desired, the control PCB may be disconnected from the cable and set aside while wiring.

5.

The detector leads are factory wired. Verify that the detector leads are wired to the detector terminal strip as shown in the applicable figure below:

• Catalytic LEL/Combustible IR/CO

2

Detectors

The wiring for these types of detectors is the same. Red wire to terminal labeled

LEL R, white wire to terminal labeled LEL W, green wire to terminal labeled LEL

G, black wire to terminal labeled LEL B.

Black

Green

White

Red

Figure 18: Catalytic LEL Detector Wiring

Black

Green

White

Red

Figure 19: Combustible IR/CO

2

Detector Wiring


• Oxygen Detector, Partial Pressure, Capillary Type, and CSA Capillary Type

The wiring for all the oxygen detectors is the same. White wire to terminal labeled

OXY +, green wire to terminal labeled OXY -.

Green

White

Figure 20: Partial Pressure Oxygen Detector Wiring

Green

White

Figure 21: Capillary Oxygen Detector Wiring

Green

White

19

Figure 22: CSA Capillary Type Oxygen Detector Wiring


Green

White

Figure 23: Capillary Type Replaceable Sensor Oxygen Detector Wiring

• CSA type CO or H

2

S gas detector.

Red wire to terminal labeled TOXIC +, black wire to terminal labeled TOXIC -.

Black

Red

Figure 24: H

2

S/CO Detector Wiring, CSA

• Non Explosion Proof CO or H

2

S gas detector


Black

Red


Figure 25: H

2

S/CO Detector Wiring

20

• ESM-01 Toxic Detectors

The ESM-01 toxic detectors have one black wire and one color coded wire. Connect the color coded wire (see chart below) to the terminal labeled TOXIC + and the black wire to the terminal labeled TOXIC -.

Black

21

See Chart

Wire Color Gas Type

Brown AsH3

Yellow Cl2

Red NH3

Orange NO

Green PH3

Blue SO2

Figure 26: ESM-01 Toxic Detector Wiring

6.

To gain access to a plug-in terminal strip for wiring, pull it out of its socket by grasping the wall between two terminal positions with needle nose pliers and pulling.

Be careful not to exert too much force on the wall to avoid damage to the terminal strip. The detector terminal strip and the alarm 1 relay terminal strip may be removed by grasping them with your fingers if the adjacent terminal strips have been removed.

WARNING: If the M2 is installed in a hazardous location, use appropriately rated conduit, conduit fittings, and appropriate construction technique that complies with the local electrical code.

In addition, use appropriately rated conduit, conduit fittings, and appropriate construction technique to maintain the NEMA 4 environmental rating of the junction box and avoid water entering the junction box at the conduit hubs.

7.

Guide multi conductor shielded cable or cables or wires in conduit through the top conduit hub of the junction box. The number of cables or wires needed will depend on whether the M2 is wired to a gas monitoring controller or just to power, whether any relays are used, and whether the Modbus output is used. Use the following recommendations to determine how to wire the M2:

• If Modbus connections will not be used and only the PWR/SIG connections will be used, use a two or three conductor shielded cable or two or three wires in conduit for connections to the power/signal terminal strip depending on whether or not the signal (S) terminal is used. The S terminal has a 4 - 20 mA output, but if you do not need to monitor this signal and do not connect to the S terminal to


access this signal, the M2 will still function completely.

Table 4: Wire Size for PWR/SIG Connections

Max Distance to Controller w/18 Gauge Wire

2,500 ft.


5,000 ft.


8,000 ft.

• If the PWR/SIG connections and one or more relays are used, route the connections to the M2 in conduit. Use shielded cable in the conduit for the PWR/

SIG connections and unshielded cable or individual wires for the relay connections. Make sure any wire or cable used for relay wiring is appropriately rated for the power that it will carry.

NOTE: If shielded cable is used for the PWR/SIG connections, leave the cable shield’s drain wire insulated and disconnected at the M2. You will connect the opposite end of the cable’s drain wire at the controller or device.

• If the M2 will be wired into a Modbus network, see “Chapter 8: RS-485 Modbus

Output” on page 50.

See Figure 27 below for field wiring connections to the M2.

Alarm Device

Power

Controller

Terminals

(24 VDC)

4 - 20 mA In (S)

(24 VDC)

See

Detector

Wiring

See

Modbus

Wiring

Fail Alarm

Device

Alarm 1 Alarm

Device

Alarm 2 Alarm

Device

Typical Alarm

Wiring Shown

Figure 27: Wiring the M2 to a Controller and Alarm Devices

8.

Re-install the control PCB (and ribbon cable if necessary). Be sure the ribbon cable is routed down below the control PCB so it will not be damaged by the cover when it is screwed back on.

9.

Secure the junction box cover to the junction box.

10. Make controller, device, and relay connections as appropriate. If shielded cable is used for the PWR/SIG connections, connect the cable shield’s drain wire to an


available chassis ground at the gas monitoring controller, recording device, or programmable controller.

Start Up

Introducing Incoming Power

1.

Complete the installation procedures described earlier in this manual.

2.

Verify that all wiring connections are correct and secure.

3.

Turn on the incoming power.

4.

If necessary, turn on the controller or other monitoring device that is connected to the

M2.

5.

The LCD display will indicate the firmware version when the M2 is first powered up and will then count down a one minute warm-up period before normal operation begins. During normal operation, the display will indicate the target gas and current gas reading. Verify that the display is indicating the target gas and current gas reading after the warm-up period is complete and normal operation begins.

METHANE

0 %LEL

NOTE: Allow the M2’s detector to warm up for 15 minutes before you continue with the next section, “Adjusting the Fresh Air Reading.”

Adjusting the Fresh Air Reading

When the M2 is shipped from RKI Instruments, Inc., it is factory calibrated. If a full calibration is desired at startup, see “Calibration, Combustible Gas, CO2, and Toxic

Versions” on page 40 or “Calibration, Oxygen Version” on page 43.

Verify that the M2 is in a fresh air environment (environment known to be free of the target gas and combustible or toxic gas vapors and of normal oxygen content, 20.9%).

CAUTION: If you suspect the presence of combustible gas, CO

2

, toxic gas, or that the oxygen content is not normal in the monitoring environment, use the calibration kit and the zero air calibration cylinder to introduce “fresh air” to the detector and verify an accurate fresh air setting. See the “Calibration, Combustible Gas, CO2, and

Toxic Versions” on page 40 or “Calibration, Oxygen Version” on page 43 for instructions on how to use a zero air cylinder when performing a fresh air adjustment.

Non-Intrusive Fresh Air Signal Adjustment

If the M2 is installed in a classified area and non-intrusive zero adjustment is required, follow the instructions below, but do not remove the junction box cover. Use the magnetic wand accessory to actuate the magnetic switches instead of pushing the control switch buttons. To actuate a magnetic switch and perform the same operation as pressing a control switch button, touch the magnet in the end of the magnetic wand to the M2’s glass cover directly over the magnetic switch you wish to actuate. Touching the glass and removing the wand is the same as pressing and releasing a button. Touching the glass and keeping the wand in place is the same as pressing and holding a button.


WARNING: The M2 is not an active gas monitoring device during the fresh air adjustment procedure. The 4-20 mA output signal will “freeze” at 3.5 mA for a toxic, combustible gas, or CO

2

M2, or at 17.4 mA for an oxygen M2, and all relays will remain in their non-alarm state while the M2 is in

Calibration Mode. The output signal will not indicate current readings and the relays will not resume operating normally until the M2 is in normal operation again.

NOTE: While in the calibration program, if there is no switch activity for the calibration time-out period the unit will return to normal operation. The factory set time-out is 15 minutes. If you want a different time-out period, see

“Viewing & Changing M2 Parameters” on page 30 for instructions to change the calibration time-out.

Combustible Gas, CO

2

, and Toxic Versions, Adjusting the Fresh Air Reading

1.

While in normal operation, press and hold the UP/YES button for 5 seconds to enter

Calibration Mode. Release the button when the following screen appears.

Calib?

YES/NO

2.

Press and release the UP/YES button to continue. The display will indicate the target gas and CAL Mode for a few seconds before showing FreshAir Adjust?.

3.

Press and release the UP/YES button. ENTER will alternate with FreshAir on the top display line and the current gas reading will be on the bottom display line.

4.

Press and release the ENTER button. The M2 will perform a zero operation and the display will indicate SPAN w/Cal Gas?.

5.

Press and release the DOWN/NO button. The display will indicate Leaving CAL

Mode and the M2 will return to normal operation.

Oxygen Version, Adjusting the Fresh Air Reading

1.



Calib?

YES/NO

2.

Press and release the UP/YES button to continue. The display will indicate OXYGEN

CAL Mode for a few seconds before showing FreshAir Adjust?.

3.

Press and release the UP/YES button. ENTER will alternate with FreshAir on the top display line and the current oxygen reading will be on the bottom display line.

4.

Press and release the ENTER button. The M2 will perform a span operation and then the display will indicate ZERO w/Cal Gas?.

5.

Press and release the DOWN/NO button. The display will indicate Leaving CAL

Mode and the M2 will return to normal operation.


Chapter 4: Operation

Overview

This chapter describes the M2 in normal operation. This chapter also describes the M2 in alarm 1, alarm 2, and fail conditions and suggests responses to these conditions.

Normal Operation

Normal operation is defined as follows:

• The start-up procedure is complete.

• The M2 is not indicating an alarm 1, alarm 2, or fail condition.

• The M2 is not in Calibration, Configuration, or Gas Type modes.

During normal operation, the M2 simultaneously displays the current gas reading, unit of measure, and target gas. The example below illustrates a typical combustible gas M2.

METHANE

0 %LEL

Information Screen

The Information Screen displays the M2’s operating voltage and firmware and hardware information. To display the Information Screen, do the following:

1.

Press and hold the DOWN/NO button for 3 seconds. The Information Screen will appear.

24.2V v5.0L 2A

2.

Continue holding the DOWN/NO button to keep the Information Screen on the display. The top line indicates the operating voltage that is connected to the M2. The second line indicates the firmware that is running, version 5.0 in this example, and the

M2’s hardware version, version 2A in this example. This information may be useful if you need to contact the factory with questions about the M2.

3.

Release the DOWN/NO button when you are done viewing the Information Screen.

The display will return to the normal operation screen within a couple of seconds.


4 - 20 mA Signal Output Operation

The output at the S terminal of the power/signal terminal strip is a 4 - 20 mA signal that corresponds to the detection range of the M2. During normal operation, this signal tracks the gas concentration on the LCD.

There are several circumstances where the signal output will not track the display reading but will behave as follows:

• When the M2 is in its warm-up period, the signal output will be fixed at 3.5 mA (zero) for all gas types except oxygen. For oxygen types, the output will be fixed at 17.4 mA

(20.9% oxygen) while the M2 is in warm-up.

• When the M2’s gas type is changed, the M2 will enter Configuration Mode for you to verify the parameter settings. When you exit Configuration Mode, the display will indicate NEEDS CALIBRATION and will continue to indicate this until Calibration

Mode is entered and a calibration is performed. In this situation, the signal output will be fixed at 3.5 mA for LEL and toxic versions and 17.4 mA for oxygen versions from the time Gas Type Mode is entered until the M2 is calibrated and returns to normal operation.

• If you enter Calibration Mode, Configuration Mode, Gas Type Mode, or Modbus

Mode, the signal output will be fixed at 3.5 mA for combustible gas, CO

2

, and toxic versions and 17.4 mA for oxygen versions until the M2 returns to normal operation.

• If the M2’s input power decreases below 18.5 volts so that the M2 is in a low power alarm, the signal output is fixed below 2.4 mA until the low power alarm is cleared.

• If the M2 goes into a fail condition, the signal output is fixed below 2.4 mA until the fail alarm is cleared.

Alarm Indications

NOTE: The M2 includes alarm on and alarm off delay settings for alarm 1 and alarm 2.

The alarm indications described in this section operate according to the factory set alarm settings. See Table 6 on page 31 for all the factory settings.

Condition

Alarm 1

1

Alarm 2

Fail

1

Table 5: Visual and Audible Alarm Indications

Cause

Increasing (decreasing for O

2

) gas reading at or above the alarm 1 setpoint

Increasing gas reading at or above the alarm 2 setpoint

• Disconnected or misconnected detector wiring

• Display reading at -10% of full scale or lower

• Defective components

Visual Indication(s)

• A1 LED is on

• Gas reading alternates with ALARM-1 message

• A2 LED is on

• Gas reading alternates with ALARM-2 message

• F LED is on

• FAIL message replaces gas reading


27

Table 5: Visual and Audible Alarm Indications

Condition Cause Visual Indication(s)

Low Power

*

DC power source less than 18.5 volts.

• F LED is on

• LowPower message and actual voltage of incoming DC power

1

If the M2 is in both an alarm 1 and an alarm 2 condition, both alarm LEDs are on and the display alternates between the gas reading and the ALMS 1&2 message.

NOTE: You can select normally energized (N. EN) or normally de-energized (N. DE-

EN) alarm 1 and alarm 2 relay settings in Configuration Mode. The following sections describe the standard factory setting for these relays which is

N. DE-EN.

The fail relay is factory set as N. EN and is not user-adjustable.

Alarm 1 Condition

Alarm 1 Condition Indications

When the gas reading reaches the alarm 1 setpoint, the M2 senses an alarm 1 condition.

The M2 alerts you to an alarm 1 condition as follows:

• The A1 LED turns on.

• The gas reading alternates with the ALARM-1 message.

• The alarm 1 relay energizes.

Responding to an Alarm 1 Condition

1.

Follow your established procedure for a low level combustible or toxic gas condition or a decreasing oxygen concentration condition.

2.

After the gas reading falls below (above for oxygen) the alarm 1 setpoint, press the

ENTER button to reset the alarm 1 circuit. Resetting the alarm 1 circuit turns off the

A1 LED, resets the LCD, and de-energizes the alarm 1 relay.

NOTE: If the ENTER button is pressed while the M2 is in an alarm 1 condition, the A1

LED will flash but all other indications will remain unchanged.

You cannot de-energize the alarm 1 relay until the gas reading falls below

(above for oxygen) the alarm 1 setpoint.

Alarm 2 Condition

Alarm 2 Condition Indications

When the gas reading reaches the alarm 2 setpoint, the M2 senses an alarm 2 condition.

The M2 alerts you to an alarm 2 condition as follows:

• The A2 LED turns on.

• The gas reading alternates with the ALARM-2 message.

• The alarm 2 relay energizes.


NOTE: If the M2 is in both an alarm 1 and alarm 2 condition, both the A1 and A2 LEDs will be on, the gas reading will alternate with the ALMS 1&2 message, and both alarm relays will energize.

Responding to an Alarm 2 Condition

1.

Follow your established procedure for a high level combustible or toxic gas condition or an increasing oxygen concentration condition.

2.

After the gas reading falls below the alarm 2 setpoint, press the ENTER button to reset the alarm circuit. Resetting the alarm circuit turns off the A2 light, resets the LCD, and de-energizes the alarm 2 relay.

NOTE: If the ENTER button is pressed while the M2 is in an alarm 2 condition, the A2

LED will flash but all other indications will remain unchanged.

You cannot de-energize the alarm 2 relay until the gas reading falls below the alarm 2 setpoint.

Fail Condition

Fail Condition Indications

The M2 indicates a fail condition for any of the following:

• The detector wiring is disconnected or incorrectly connected.

• The display reading is -10% of full scale or lower.

When the M2 senses a fail condition, it alerts you as follows:

• The F LED turns on.

• The gas reading is replaced by the FAIL message.

• The fail relay de-energizes.

Responding to a Fail Condition

1.

Verify that the detector wiring is correctly and securely connected.

2.

If the M2 has a replaceable plug-in sensor, verify that the replaceable plug-in sensor in the detector housing is properly installed.

Low Power Alarm

Low Power Alarm Indications

The M2 senses a low power condition when the DC power source is 18.5 volts or less.

WARNING: While in a low power condition, the M2 is not an active gas monitor.

When the M2 senses a low power condition, it alerts you as follows:

• The F LED turns on.

• The message LowPower is indicated on the top line of the LCD and the input voltage is displayed on the bottom line of the LCD.

• The fail relay de-energizes.


NOTE: The low power alarm cannot be cleared using the ENTER button.

When the voltage increases to 19.0 volts, the low power alarm is cleared and the M2 will begin its warm-up sequence.

Responding to a Low Power Condition

1.

Determine and correct the cause of the low power condition.

2.

When the input power increases above 19.0 volts, the M2 will begin its warm-up sequence.

3.

Verify that the M2 enters normal operation after its warm-up sequence. If necessary, perform a fresh air adjustment. See “Adjusting the Fresh Air Reading” on page 23.


Chapter 5: Configuration Mode

Overview

This chapter describes how to view and change M2 parameters using Configuration

Mode. It is accessed using the program buttons.

Configuration Mode includes a 5-minute time-out feature. If you do not press a control button for 5 minutes, the M2 automatically returns to normal operation.

NOTE: If the M2 returns to normal operation because of a time-out, it enters a warmup period just as it does when it is first turned on.

If you are installing a new M2, it has been setup at the factory. Use

Configuration Mode only if you want to change the M2’s setup. If you want to change the detector type see “Chapter 6: Gas Type Mode” on page 33.

Viewing & Changing M2 Parameters

1.

While in normal operation, simultaneously press and hold the UP/YES and ENTER buttons for 5 seconds to enter Configuration Mode. Release the buttons when the following screen appears.

Enter

Config?

2.

If you want to exit Configuration Mode, press and release the DOWN/NO button and the M2 will return to normal operation.

If you want to continue in Configuration Mode, press and release the UP/YES button.

The target gas and the full scale will be displayed for a few seconds before the first adjustable parameter, the alarm 1 setpoint, is displayed.

3.

If you want to change the currently displayed parameter, use the UP/YES and

DOWN/NO buttons to adjust it to the desired setting, then press ENTER to continue to the next parameter.

If the currently displayed parameter is OK, press the ENTER button to proceed to the next parameter.

Table 6 lists the M2 parameters you can set. Table 6 also lists the factory set value for each parameter.


Table 6: Configuration Parameters

Parameter

(Factory Set Value)

Description

ALARM-1 (level)

(See “M2 Specifications” on page 2)

ALARM-1 (activation)

(Decrease for oxygen M2, Increase for all other types)

ALARM-1 (relay action)

(N. DE-EN)

The gas reading at which the M2 initiates an alarm 1 condition.

Indicates if the alarm 1 circuit is activated by gas readings increasing

(Increase) or decreasing (Decrease) to the ALARM-1 Level.

ALARM-1 (relay reset)

(LATCH)

A1 OnDy (alarm 1 on delay)

(1 secs)

A1 OffDy (alarm 1 off delay)

(0 sec.)

If set as N. DE-EN, the alarm 1 relay is de-energized in normal operation and energizes when an alarm 1 condition is initiated.

If set as N. EN, the alarm 1 relay is energized in normal operation and de-energizes when an alarm 1 condition is initiated.

If set as LATCH, you must press the ENTER button to reset the alarm 1 circuit after the alarm 1 condition passes.

If set as SELF-RST, the M2 automatically resets the alarm 1 circuit after the alarm 1 condition passes.

The amount of time the M2 delays activation of the alarm 1 circuit once an alarm 1 condition is initiated. It can be set in 1 second increments from 0 - 60 seconds, in 1 minute increments from 1 - 15 minutes, and in

15 minute increments from 15 - 60 minutes.

The amount of time the M2 delays turning off the alarm 1 circuit once an alarm 1 condition passes. This parameter appears only if the alarm 1 relay reset setting is set to SELF-RST. It can be set in 1 second increments from 0 - 60 seconds, in 1 minute increments from 1 - 15 minutes, and in 15 minute increments from 15 - 60 minutes.

The gas reading at which the M2 initiates an alarm 2 condition.

ALARM-2 (level)

(See “M2 Specifications” on page 2)

ALARM-2 (activation)

(Increase for all types)

ALARM-2 (relay action)

(N. DE-EN)

ALARM-2 (relay reset)

(LATCH)

A2 OnDy (alarm 2 on delay)

(1 secs)

A2 OffDy (alarm 2 off delay)

(0 sec.)

Indicates if the alarm 2 circuit is activated by gas readings increasing

(Increase) or decreasing (Decrease) to the ALARM-1 Level.

If set as N. DE-EN, the alarm 2 relay is de-energized in normal operation and energizes when an alarm 2 condition is initiated.

If set as N. EN, the alarm 2 relay is energized in normal operation and de-energizes when an alarm 2 condition is initiated.

If set as LATCH, you must press the ENTER button to reset the alarm 2 circuit after the alarm 2 condition passes.

If set as SELF-RST, the M2 automatically resets the alarm 2 circuit after the alarm 2 condition passes.

The amount of time the M2 delays activation of the alarm 2 circuit once an alarm 2 condition is initiated. It can be set in 1 second increments from 0 - 60 seconds, in 1 minute increments from 1 - 15 minutes, and in

15 minute increments from 15 - 60 minutes.

The amount of time the M2 delays turning off the alarm 2 circuit once an alarm 2 condition passes. This parameter appears only if the alarm 2 relay reset setting is set to SELF-RST. It can be set in 1 second increments from 0 - 60 seconds, in 1 minute increments from 1 - 15 minutes, and in 15 minute increments from 15 - 60 minutes.


Table 6: Configuration Parameters (Continued)

Parameter

(Factory Set Value)

Description

ZeroSupp

(0.5% oxygen for oxygen types, 2% of the detection range in terms of the detection units for all other types)

FILTER

(5 secs)

CAL Time

(15 mins)

Auto Zero

(Enabled)

The zero suppression feature helps prevent “jumpy” readings near the fresh air reading.

For example, if the zero suppression setting for a combustible LEL detector is 2.0% LEL, the M2 will display a reading of 0% LEL for gas readings from -2% LEL to 2% LEL. It is settable from 0 to 6% of the detection range.

The filter feature helps “smooth out” jumpy or noisy signals from the detector. You can set the filter from 0 seconds to 60 seconds in 5 seconds increments.

The displayed gas reading is the average reading over the previous time period defined by the filter setting. So if the filter is set to 5 seconds, the displayed gas reading is the average over the past 5 seconds.

The calibration time-out sets the amount of time after the last button push while in Calibration Mode that the M2 will wait before returning to normal operation. If the calibration time-out is set to 15 mins, then M2 will return to normal operation automatically 15 minutes after the last button push.

If set to Enabled, the M2’s firmware will monitor the zero (fresh air) reading and make automatic zero adjustments under precisely specified conditions if it determines that a reading change is due to normal sensor drift.

If set to Disabled, the Auto Zero function is turned off.

4.

When you have scrolled through all the adjustable parameters, SAVE IT? YES/NO appears on the display.

5.

If you do not wish to save the adjustments and want to exit Configuration Mode, press and release the DOWN/NO button. The DO OVER? YES/NO message will display. Press and release the DOWN/NO button. The ABORT? YES/NO message will display. Press the UP/YES button to return to normal operation.

If you wish to change some of the adjustments made, press and release the DOWN/

NO button. The DO OVER? YES/NO message will display. Press and release the UP/

YES button. The Re-do Config message will display and the M2 will return to the first adjustable parameter. Go back to step 3 and continue.

If you wish to save the adjustments made, press and release the UP/YES button.

Config Saved is indicated on the display for a few seconds and the M2 returns to normal operation.


Chapter 6: Gas Type Mode

Overview

This chapter describes how to use Gas Type Mode to select the M2’s gas type. The gas type determines the target gas and detection range. The combustible gas/CO

2

and toxic/ oxygen M2s have a different terminal PCB and run on different firmware. Your M2 will only have gas type choices available that it can support.

Gas Type Mode includes a 5-minute time-out feature. If you do not press a button for 5 minutes, the M2 automatically returns to normal operation.

NOTE: If the M2 enters normal operation because of a program time-out, it enters a warm-up period just as it does when it is first turned on.

Selecting the Gas Type

1.

While in normal operation or during the warm-up sequence, press and hold the UP/

YES and DOWN/NO buttons for five seconds. Release them when the following screen appears.

Select

GasType?

2.

If you want to exit Gas Type Mode, press and release the DOWN/NO button. The display will indicate NO CHANGE and the M2 will return to normal operation.

If you want to continue in Gas Type Mode, press and release the UP/YES button. The top display line will indicate GasType? and the bottom display line will indicate the target gas choice.

3.

Use the UP/YES or DOWN/NO button to scroll through the choices of target gas.

Table 7 and Table 8 below list the choices of target gas for the M2.

Table 7: Combustible Gas/CO

2

Gas Types

Gas Type

Choices

HC iBUTANE

PROPANE

HEXANE

HYDROGEN

METHANE

METHANE

Detection Range

0 - 100% LEL

0 - 100% LEL

0 - 100% LEL

0 - 100% LEL

0 - 100% LEL

0 - 100% Volume

0 - 100% LEL


Table 7: Combustible Gas/CO

2

Gas Types

CO2

CO2

CO2

CO2

CO2

NH3

NH3

Gas Type

Choices

Detection Range

0 - 5,000 ppm

0 - 2,000 ppm

0 - 100% volume

0 - 50.0% volume

0 - 5.00% volume

0 - 5.00% volume

0 - 2.00% volume

Table 8: Toxic/Oxygen Gas Types

Gas Type

Choices

HF

HCN

HCL

H2SE

GEH4

F2

CLO2

B2H6

H2S

CO

OXYGEN

SIH4

SI2H6

PH3

O3

NO

ASH3

SO2

NH3

Detection Range

0 - 100 ppm

0 - 300 ppm

0 - 25.0% volume

0 - 15.0 ppm

0 - 15.0 ppm

0 - 1.00 ppm

0 - 1.00 ppm

0 - 100 ppm

0 - 9.00 ppm

0 - 15.0 ppm

0 - 15.0 ppm

0 - 5.00 ppm

0 - 1.50 ppm

0 - 3.00 ppm

0 - 1.00 ppm

0 - 5.00 ppm

0 - 1.50 ppm

0 - 6.00 ppm

0 - 200 ppm


35

Table 8: Toxic/Oxygen Gas Types

Gas Type

Choices

NH3

CL2

Detection Range

0 - 75.0 ppm

0 - 3.00 ppm

NOTE: Consult factory for availability of detectors for toxic M2 types not listed in “M2

Specifications” on page 2.

4.

When the desired target gas is on the display, press and release the ENTER button.

The display will ask SAVE IT? YES/NO.

5.

To discard the gas type change, press and release the DOWN/NO button. The display will ask DO OVER? YES/NO. Press the DOWN/NO button. The display will ask

ABORT? YES/NO . Press the UP/YES button. The M2 will return to normal operation without changing the gas type.

To save the gas type, press and release the UP/YES button. The display will indicate

Gas Type Updated , the display will indicate the target gas and the detection range for a few seconds, and then the M2 will enter Configuration Mode automatically so that the parameter settings in Configuration Mode can be verified or changed.

6.

While in Configuration Mode press and release the ENTER button to accept the displayed parameter setting and move to the next one. Use the UP/YES and DOWN/

NO buttons to adjust a setting. See “Chapter 5: Configuration Mode” on page 30 for a complete description of Configuration Mode.

7.

When you have reviewed and accepted the last item in Configuration Mode by pressing the ENTER button, display will ask SAVE IT? YES/NO.

8.

To save the configuration settings, press and release the UP/YES button.The display will indicate Config Saved and the M2 will begin its warm-up sequence.

To discard the settings and review them again, press the DOWN/NO button. The display will ask DO OVER? YES/NO. Press the UP/YES button and the display will indicate Re-do Config, then display the target gas and the detection range for a few seconds before returning to Configuration Mode. Repeat steps 6 - 8 until the settings are as desired.

9.

After the M2 completes its warm-up sequence, the display will indicate CAL

NEEDED . Since the gas type has been changed, a successful calibration must be performed before the M2 can enter normal operation.

10. Press and release the UP/YES button to enter Calibration Mode. Normally, you must hold the UP/YES button for 5 seconds to enter Calibration Mode, but since a calibration is required, only a momentary push is needed to enter Calibration Mode after changing the gas type.

11. See “Calibration, Combustible Gas, CO2, and Toxic Versions” on page 40 or

“Calibration, Oxygen Version” on page 43 for calibration instructions.

NOTE: When calibrating an M2 after changing the gas type, the M2 will not ask if you want to calibrate, or whether you want to perform a fresh air adjustment, span adjustment or zero adjustment. Since a complete calibration is required, the calibration sequence will proceed without asking if you want to perform certain operations.


Chapter 7: Maintenance

Overview

This chapter describes procedures for performing preventive maintenance, troubleshooting, calibrating the M2, and replacing field replaceable parts. It includes separate procedures for calibrating the combustible gas/CO

2

/toxic and oxygen versions of the M2.

Preventive Maintenance

This section describes a recommended preventive maintenance schedule to ensure the optimum performance of the M2. It includes daily, monthly, and quarterly procedures.

Daily

Verify a display reading of zero (20.9% for an oxygen M2). Investigate significant changes in the reading.

Monthly

This procedure describes a test to verify that the M2 responds properly to the target gas.

NOTE: Performing a response test on the M2 may cause alarms. If you do not want external alarms to actuate, disable any external alarms during the response test to avoid unwanted external alarm indications.

NOTE: The following procedure assumes the use of a calibration kit which includes a calibration gas cylinder, a fixed flow regulator with an on/off knob, a calibration cup for the detector, and a short piece of sample tubing to connect the regulator to the calibration cup.

1.

Disable all external alarms if external alarm indications are not desired during the response test.

2.

Connect the calibration kit sample tubing to the calibration cup hose barb.

3.

Screw the calibration cup onto the detector.

NOTE: For an ESM-01 detector, you must unscrew the removable splashguard from the detector housing cap so you can push the appropriate calibration cup onto the ESM-01 sensor. Make sure to use the correct calibration cup for the sensor being used. There is a Cl

2

type calibration cup for a Cl

2

sensor, an NH

3

type calibration cup for an NH

3

sensor, and a general type (usually labeled SO

2

) calibration cup for all other ESM-01 sensors.

4.

Connect the fixed flow regulator to the calibration cup using the sample tubing.


37

NOTE: When applying gas to an NH

3

ESM-01, the 0.25 LPM flowrate regulator must be used. All other M2s require a 0.5 LPM flowrate regulator.

5.

Screw the calibration gas cylinder into (onto for an H

2

S cylinder) the fixed flow regulator.

6.

Turn the regulator knob counterclockwise to open the regulator.

7.

Allow calibration gas to flow for one minute.

8.

Verify that the display reading is within ± 20% of the gas concentration.

NOTE: If the reading is not within ± 20% of the gas concentration, calibrate the M2 as described in “Calibration, Combustible Gas, CO2, and Toxic Versions” on page 40 or “Calibration, Oxygen Version” on page 43.

9.

Turn the regulator knob clockwise to close the regulator.

10. Unscrew the calibration gas cylinder from the fixed flow regulator and unscrew the calibration cup from the detector.

For an ESM-01 detector, pull the calibration cup off the ESM-01 sensor and screw the splashguard back onto the detector housing cap.

11. If external alarms have been disabled, enable them when the display returns to a normal fresh air reading.

12. Store the components of the calibration kit in a safe place.

Quarterly

Calibrate M2s that do not have an IR detector as described in “Calibration, Combustible

Gas, CO2, and Toxic Versions” on page 40 or “Calibration, Oxygen Version” on page 43.

See “Calibration Frequency” on page 40 for a discussion of calibration frequency guidelines.

Biannually

Calibrate M2s that have an IR detector as described in “Calibration, Combustible Gas,

CO2, and Toxic Versions” on page 40. See “Calibration Frequency” on page 40 for a discussion of calibration frequency guidelines.


Troubleshooting

The troubleshooting guide describes symptoms, probable causes, and recommended action for problems you may encounter with the M2.

NOTE: This troubleshooting guide describes M2 problems only. If the M2 is connected to a controller, see the controller operator’s manual for problems you may encounter with the controller.

Table 9:Troubleshooting the Combustible Gas Detector

Condition

No Power

Frequent or

Suspect

Alarms

Flickering

Display

Symptom(s) Probable Causes Recommended Action

The display backlight is off and the display screen is blank.

The M2 alerts you to frequent or suspect alarms while the fresh air readings remain on zero (20.9 for oxygen).

The display reading flickers often.

• The power wiring is disconnected or misconnected.

• The display cable is disconnected or misconnected.

• The M2 is experiencing false readings due to RFI or EMI.

• The detector wiring is disconnected, misconnected, or intermittent.

• The M2 is experiencing false readings due to RFI or EMI.

• The noise filter setting is too low.

• The zero suppression setting is too low.

• The display screen is malfunctioning.

1. Verify that the wiring to the power source or controller is correct and secure.

2. Verify that the ribbon cable connecting the terminal PCB to the control PCB is securely installed. This ribbon cable plugs into a connector on the top edge of the control PCB and on the bottom of the terminal PCB.

3. If the power difficulties continue, contact RKI for further instruction.

1. Verify that the M2 wiring is properly shielded. See “Wiring the M2 Transmitter” on page 18.

2. Verify that the detector wiring is correct and secure.

3. Increase the alarm on delay setting in Configuration Mode.

4. If the frequent or suspect alarm difficulties continue, contact RKI for further instruction.

1. Verify that the M2 wiring is properly shielded. See “Wiring the M2 Transmitter” on page 18.


3. Increase the filter setting in

Configuration Mode.

4. Increase the zero suppression setting in Configuration Mode.

5. If the display difficulties continue, contact RKI for further instruction.


Table 9:Troubleshooting the Combustible Gas Detector (Continued)

Condition

Fail

Condition

Slow or No

Response/

Difficult or

Unable to

Calibrate

Symptom(s) Probable Causes Recommended Action

• M2 indicates a fail condition.

• Controller indicates a fail condition

• M2 responds slowly or does not respond to response test.

• Unable to successfully set the fresh air or span (zero for oxygen) reading during calibration.

• M2 requires frequent calibration.

Note: See “Calibration

Frequency” on page 40 for calibration frequency guidelines.

• The detector wiring to the terminal PCB is disconnected or misconnected.

• The wiring from the

M2 to the controller is disconnected or misconnected.

• The detector fresh air signal is low enough to cause a fail condition.

• The detector is malfunctioning.

• The terminal or display PCB is malfunctioning.

• The calibration cylinder is low, outdated, or defective.

• The detector is malfunctioning.

• The terminal PCB is malfunctioning.


2. Verify that the wiring between the

M2 and the controller is correct and secure.

3. Calibrate the M2.

4. If the fail condition continues, replace the detector.

5. If the fail condition continues, contact RKI for further instruction.

1. Verify that the calibration cylinder contains an adequate supply of a fresh test sample.

2. If the calibration/response difficulties continue, replace the detector.

3. If the calibration/response difficulties continue, contact RKI for further instruction.


Calibration Frequency

Some M2s have IR (infrared) type detectors, such as an M2 for CO

2

or an LEL M2 with an

IR detector. Most of the M2s do not have an IR detector. For example, an H

2

S M2 has an electrochemical detector and some of the combustible M2s use catalytic detectors. The

M2s that use IR detectors typically need less frequent calibration as is discussed below.

See Table 1, “M2 Specifications,” on page 2 to see which M2s are IR versions.

Although there is no particular calibration frequency that is correct for all applications, a calibration frequency of every 3 to 6 months for M2s that do not have an IR detector and every 6 to 12 months for M2s that have an IR detector is adequate for most M2 applications. Unless experience in a particular application dictates otherwise, RKI

Instruments, Inc. recommends a calibration frequency of every 3 months for M2s that do not have an IR detector and every 6 months for M2s that have an IR detector.

If an application is not very demanding, for example detection in a clean, temperature controlled environment where the toxic or combustible target gas is not normally present, and calibration adjustments are minimal at calibration, then a calibration frequency of every 6 months for a non-IR M2 or 12 months for an IR M2 is adequate.

If an application is very demanding, for example if a combustible or toxic gas is present often and in significant concentrations or the environment is not well controlled, then more frequent calibration than every 3 months for a non-IR M2 or every 6 months for an

IR M2 may be necessary. For combustible gas detection with an M2 that uses a catalytic detector, if potential catalyst poisons are known or likely to be present, more frequent calibration than every 3 months will be necessary.

Calibration, Combustible Gas, CO

2

, and Toxic Versions

This section describes how to calibrate the combustible gas, CO

2

, and toxic gas versions of the M2. It includes procedures to prepare for calibration, enter Calibration Mode, adjust the fresh air (zero) setting, adjust the span setting, and return to normal operation. See the next section, “Calibration, Oxygen Version” for instructions to calibrate an oxygen M2.

WARNING: The M2 is not an active gas monitoring device during the calibration procedure. The 4-20 mA output signal will “freeze” at 3.5 mA and all relays will remain in their non-alarm state while the M2 is in Calibration

Mode. The output signal will not indicate current readings and the relays will not resume operating normally until the M2 is in normal operation again.

Preparing for Calibration

NOTE: The following procedure assumes the use of a calibration kit which includes a calibration gas cylinder, a zero air cylinder, a fixed flow regulator with an on/ off knob, a calibration cup for the appropriate sensor, and a short piece of sample tubing to connect the regulator to the calibration cup.


41

NOTE: While in the calibration program, if there is no switch activity for the calibration time-out period the unit will return to normal operation. See

“Viewing & Changing M2 Parameters” on page 30 for instructions to set the calibration time-out.

NOTE: The following procedure assumes that the target gas is present in a high enough concentration to affect the fresh air (zero) reading. If a fresh air environment can be verified, applying zero air to the detector is not necessary when setting the zero (span for oxygen) reading.

1.


2.


NOTE: For an ESM-01 detector, you must unscrew the removable splashguard from the detector housing cap so you can push the appropriate calibration cup onto the ESM-01 sensor. Make sure to use the correct calibration cup for the sensor being used. There is a Cl

2

type calibration cup for a Cl

2

sensor, an NH

3

type calibration cup for an NH

3

sensor, and a general type (usually labeled SO

2

) calibration cup for all other ESM-01 sensors.

3.


NOTE: When calibrating an NH

3

ESM-01, the 0.25 LPM flowrate regulator must be used. All other M2s require a 0.5 LPM flowrate regulator.

Non-Intrusive Calibration

If the M2 is installed in a classified area and non-intrusive calibration is required, follow the instructions below, but do not remove the junction box cover. Use the magnetic wand accessory to actuate the magnetic switches instead of pushing the control switch buttons.

To actuate a magnetic switch and perform the same operation as pressing a control switch button, touch the magnet in the end of the magnetic wand to the M2’s glass cover directly above the magnetic switch you wish to actuate. Touching the glass and removing the wand is the same as pressing and releasing a button. Touching the glass and keeping the wand in place is the same as pressing and holding a button.

Calibration Gas Response Memory Feature

The M2 has the capability to “remember” the detector’s response to the calibration gas after the gas is removed from the detector during the fresh air and span adjustment procedure. This feature enables one person to perform calibration if the detector is mounted remotely from the M2. When zero air is applied to the M2 during a fresh air adjustment, the M2 will freeze the display reading at the lowest response and the M2 will continue to display this reading and retain it in its memory until the fresh air adjustment procedure is completed. When calibration gas is applied to the M2 during a span adjustment, the M2 will freeze the display reading at the highest response to the calibration gas. The calibration gas can then be removed and the M2 will continue to display this reading and retain it in its memory until the span adjustment procedure is completed.


Adjusting the Fresh Air Reading

1.



Calib?

YES/NO

2.

If you want to continue with calibration, press and release the UP/YES button. The display will indicate the target gas and CAL Mode for a few seconds before showing

FreshAir Adjust?

.

If you want to exit Calibration Mode, press and release the DOWN/NO button. The

M2 will indicate Leaving CAL Mode and the M2 will return to normal operation.

3.

To continue with adjusting the fresh air reading, press and release the UP/YES button.

ENTER will alternate with FreshAir on the top display line and the current gas reading will be on the bottom display line.

To skip adjusting the fresh air reading, press and release the DOWN/NO button. The display will indicate SPAN w/Cal Gas?. Skip to the next section, “Adjusting the Span

Setting”.

4.

Screw the zero air cylinder into the fixed flow regulator.

5.


6.

Allow zero air to flow for two minutes. If there was gas present causing a reading on the M2, the reading should decrease and stabilize after two minutes.

7.


8.

Unscrew the zero air cylinder from the fixed flow regulator leaving the calibration cup on the detector. The M2 will continue to display the minimum gas response on the display and retain the response level in its memory.

9.

Press and release the ENTER button. The M2 will perform a fresh air adjustment and the display will indicate SPAN w/Cal Gas?.

NOTE: If the fresh air adjustment fails, see “Troubleshooting” on page 38 for recommended actions.

Adjusting the Span Setting

1.

If you want to continue with adjusting the span setting, press and release the UP/YES button. APPLY will alternate with SPAN Gas on the top display line and the current gas reading will be on the bottom display line.

If you want to skip adjusting the span reading, press and release the DOWN/NO button. The display will indicate Leaving Cal Mode and the M2 will return to normal operation.

2.

Screw the calibration gas cylinder into (onto for an H

2

S cylinder) the fixed flow regulator.

3.


4.

Allow calibration gas to flow for two minutes. The gas reading should be stable after two minutes.

5.

Turn the regulator knob clockwise to close it.


6.

Unscrew the calibration gas cylinder from the fixed flow regulator and unscrew the calibration cup from the detector. For an ESM-01 detector, pull the calibration cup off of the ESM-01 sensor and screw the splashguard back onto the detector housing cap.

The M2 will continue to display the maximum gas response on the display and retain the response level in its memory.

7.

Adjust the gas reading up or down to match the calibration gas cylinder concentration by using the UP/YES and DOWN/NO buttons, then press and release the ENTER button.

8.

The M2 will perform a span operation. The display will indicate SPAN Gas PASS for a few seconds, then indicate SPAN Gas SAVED before indicating Leaving CAL Mode for a few seconds.

NOTE: If the span adjustment fails, see “Troubleshooting” on page 38 for recommended actions.

9.

The display will now alternate between the normal operation screen and the message

REMOVE CAL GAS for 1 minute. If the calibration gas has not been removed from the detector, remove it now to avoid unwanted alarms.

During this 1 minute period, the signal output will remain fixed at 3.5 mA and the relays will remain in their non-alarm state to avoid unwanted alarms while the calibration gas clears from the detector. At the end of the 1 minute period, the

REMOVE CAL GAS message will stop appearing and the M2 will return to normal operation.


Calibration, Oxygen Version

This section describes how to calibrate the oxygen version of the M2. It includes procedures to prepare for calibration, enter Calibration Mode, set the fresh air (span) reading, set the zero reading, and return to normal operation.

WARNING: The M2 is not an active gas monitoring device during the calibration procedure. The 4-20 mA output signal will “freeze” at 17.4 mA and all relays will remain in their non-alarm state while the M2 is in Calibration

Mode. The output signal will not indicate current readings and the relays will not resume operating normally until the M2 is in normal operation again.

Preparing for Calibration

NOTE: The following procedure assumes the use of a calibration kit which includes a zero air (20.9% oxygen) calibration cylinder to set the fresh air reading, a 100% nitrogen (0% oxygen) calibration gas cylinder to set the zero reading, a fixed flow regulator with an on/off knob, a calibration cup, and a short piece of sample tubing to connect the regulator to the calibration cup. A cylinder with up to an 18% oxygen concentration may be used instead of a 100% nitrogen cylinder to set the zero reading.


NOTE: While in calibration mode, if there is no switch activity for the calibration timeout period the unit will return to normal operation. See “Viewing & Changing

M2 Parameters” on page 30 for instructions to set the calibration time-out.

NOTE: The following procedure assumes that the oxygen concentration in the calibration area is not normal, 20.9%, but is oxygen deficient. If a fresh air environment can be verified, applying zero air to the detector is not necessary when adjusting the fresh air (span) setting.

1.


2.


3.


Non-Intrusive Calibration

If the M2 is installed in a classified area and non-intrusive calibration is required, follow the instructions below, but do not remove the junction box cover. Use the magnetic wand accessory to actuate the magnetic switches instead of pushing the control switch buttons.

To actuate a magnetic switch and perform the same operation as pressing a control switch button, touch the magnet in the end of the magnetic wand to the M2’s glass cover directly above the magnetic switch you wish to actuate. Touching the glass and removing the wand is the same as pressing and releasing a button. Touching the glass and keeping the wand in place is the same as pressing and holding a button.

Calibration Gas Response Memory Feature

The M2 has the capability to “remember” the detector’s response to the calibration gas after the gas is removed from the detector during the fresh air or zero adjustment procedure. This feature enables one person to perform a calibration if the detector is mounted remotely from the M2. When zero air is applied to the M2 during a fresh air adjustment, the M2 will freeze the display reading at the highest response and the M2 will continue to display this reading and retain it in its memory until the fresh air adjustment procedure is completed. When calibration gas is applied to the M2 during a zero adjustment, the M2 will freeze the display reading at the lowest response to the calibration gas. The calibration gas can then be removed and the M2 will continue to display this reading and retain it in its memory until the zero adjustment procedure is completed.

Adjusting the Fresh Air Setting

1.



Calib?

YES/NO

2.

If you want to continue with calibration, press and release the UP/YES button to continue. The display will indicate OXYGEN CAL Mode for a few seconds before showing FreshAir Adjust?.

If you want to exit Calibration Mode, press and release the DOWN/NO button. The

M2 will indicate Leaving CAL Mode and the M2 will return to normal operation.

3.

To continue with adjusting the fresh air (span) reading, press and release the UP/YES button. ENTER will alternate with FreshAir on the top display line and the current


45 oxygen reading will be on the bottom display line.

To skip adjusting the fresh air reading, press and release the DOWN/NO button. The display will indicate ZERO w/Cal Gas?. Skip to the next section, “Adjusting the Zero

Setting”.

4.

Screw the zero air cylinder into the fixed flow regulator.

5.


6.

Allow zero air to flow for 2 minutes. If the oxygen concentration in the area is less than 20.9, the reading should stabilize after 2 minutes.

7.


8.

Unscrew the zero air cylinder from the fixed flow regulator leaving the calibration cup on the detector. The M2 will continue to display the maximum gas response on the display and retain the response level in its memory.

9.

Press and release the ENTER button. The M2 will perform a fresh air adjustment and the display will indicate ZERO w/Cal Gas?.

NOTE: If the fresh air adjustment fails, see “Troubleshooting” on page 38 for recommended actions.

Adjusting the Zero Setting

1.

If you want to continue with adjusting the zero setting, press and release the UP/YES button. APPLY will alternate with ZERO Gas on the top display line and the current oxygen reading will be on the bottom display line.

If you want to skip adjusting the zero reading, press and release the DOWN/NO button. The display will indicate Leaving Cal Mode and the M2 will return to normal operation.

2.

Screw the 100% nitrogen gas cylinder into the fixed flow regulator.

3.


4.

Allow gas to flow for 2 minutes. The gas reading should be stable after 2 minutes.

5.


6.

Unscrew the nitrogen cylinder from the fixed flow regulator and unscrew the calibration cup from the detector. The M2 will continue to display the minimum gas response on the display and retain the response level in its memory.

7.

Adjust the oxygen reading up or down to match the 100% nitrogen cylinder oxygen concentration of 0 by using the UP/YES and DOWN/NO buttons.

NOTE: If a cylinder other than a 100% nitrogen (0% oxygen) cylinder is used to set the zero reading, such as a cylinder with 12% oxygen, set the zero reading to match the cylinder’s oxygen concentration.

8.

Press and release the ENTER button. The M2 will perform a zero operation. The display will indicate ZERO Gas PASS for a few seconds, then indicate ZERO Gas

SAVED before indicating Leaving CAL Mode for a few seconds.

NOTE: If the zero adjustment fails, see “Troubleshooting” on page 38 for recommended actions.


9.

The display will now alternate between the normal operation screen and the message

REMOVE CAL GAS for 1 minute. If the calibration gas has not been removed from the detector remove it now to avoid unwanted alarms.

During this 1 minute period, the signal output will remain fixed at 17.4 mA and the relays will remain in their non-alarm state to avoid unwanted alarms while the calibration gas clears from the detector. At the end of the 1 minute period, the

REMOVE CAL GAS message will stop appearing and the M2 will return to normal operation.


Replacing Components of the M2

Replacing the Gas Detector

NOTE: For M2 versions that do not have a replaceable plug-in sensor, or if you determine that it is necessary to replace the entire detector, use the procedure in this section to change the entire detector. For M2 versions that include a replaceable plug-in sensor, see the appropriate instructions in the sections that follow this one to replace the plug-in sensor.

1.

Turn off or disconnect power to the M2.

2.

Remove the junction box cover.

3.

Grasp the control PCB by its edges.

4.

Gently pull until the control PCB is pulled away from the banana jacks. Take care not to pull too hard and damage the cable which connects the control and terminal PCB’s.

5.

Let the control PCB hang by the cable. The terminal strips are now visible on the terminal PCB. The control PCB may be left hanging while wiring is done. If desired, the control PCB may be disconnected from the cable and set aside while wiring.

6.

Remove the detector terminal strip from its socket.

7.

Disconnect the detector leads from the detector terminal strip. Note the position of the color-coded leads as you remove them.

8.

Unscrew the detector from the junction box.

9.

Guide the replacement detector leads through the bottom conduit hub of the junction box, then screw the mounting threads of the detector into the conduit hub.

10. Connect the detector leads to the detector terminal strip as follows:

• Catalytic Combustible Gas Detector, IR Combustible Gas Detector, and IR CO

2

Detector

Red wire to terminal labeled LEL RED, white to terminal labeled LEL WHT, green wire to terminal labeled LEL GRN, black wire to terminal labeled LEL BLK.

• CO or H2S gas detector.


• ESM-01 Gas Detector

Color coded wire to terminal labeled TOXIC +, black wire to terminal labeled

TOXIC -. See Figure 26, “ESM-01 Toxic Detector Wiring” on page 21 for the wire color coding.


47

• Oxygen gas detector.

Green wire to terminal labeled OXY +, white wire to terminal labeled OXY -.

11. Re-install the detector terminal strip into its socket.

12. Re-install the control PCB (and ribbon cable if necessary). Be sure the ribbon cable is routed down below the control PCB so it will not be damaged by the cover when it is screwed back on.

13. Secure the junction box cover to the junction box.

14. Turn on or reconnect power to the M2.

NOTE: Allow the replacement detector to warm up for 15 minutes before you continue with the next step.

15. Calibrate the replacement detector as described in “Calibration, Combustible Gas,

CO2, and Toxic Versions” on page 40 or “Calibration, Oxygen Version” on page 43.

Replacing the CO or H

2

S Plug-in Sensor

NOTE: This procedure is applicable for both the CSA type, explosion proof CO and

H

2

S detectors and the non-explosion proof CO and H

2

S detectors.

1.


2.

Unscrew the detector cap from the housing body. Make sure not to lose the cap gasket.

See Figure 4 - Figure 7 for illustrations of the CO or H

2

S detectors.

3.

Unplug and remove the sensor.

NOTE: The CO sensor has a charcoal disk filter held onto it by a rubber retaining boot.

When replacing a CO sensor, remove this filter and boot from the old sensor.

RKI instruments recommends replacing the charcoal disk filter whenever a CO sensor is replaced. Re-install the charcoal disk filter and retaining boot before continuing.

4.

Carefully match the replacement sensor’s male pins with the 4-socket pattern in the top section and plug it in.

5.

Make sure the cap gasket is in place and screw the detector cap back onto the housing body.

6.

Turn on or reconnect power to the M2.

CAUTION: Allow the replacement sensor to warm up for 15 minutes before you continue with the next step.

7.

Calibrate the detector as described in “Calibration, Combustible Gas, CO2, and Toxic

Versions” on page 40.

Replacing the CO Sensor Charcoal Filter

The charcoal filter is used to scrub out interfering gases from the environment being monitored, such as H

2

S and certain hydrocarbons. If you are experiencing unexplained upscale readings on a CO M2, the charcoal filter may be saturated and no longer scrubbing out interfering gases and it may be necessary to change the charcoal filter.


1.


2.

Unscrew the detector housing cap from the housing body. Make sure not to lose the cap gasket. See Figure 4 for an illustration of the CO detector.

3.

Remove the rubber retaining boot with the charcoal filter disk from the sensor.

4.

Replace the charcoal filter disk in the rubber retaining boot and install the boot onto the sensor.

5.

Make sure that the cap gasket is in place and screw the detector cap back onto the housing body.

6.


Replacing an Oxygen Plug-in Sensor

NOTE: This procedure is applicable for both the CSA type, explosion proof oxygen detector (65-2514RK) and non-explosion proof, replaceable sensor oxygen detector (65-2494RK).

1.


2.

Unscrew the detector cap from the detector housing body. Take care not to lose the cap gasket. See Figure 2 or Figure 3 for an illustration of the oxygen detector.

3.


4.

Carefully match the replacement sensor’s male pins with the 2-socket pattern in the top section and plug it in.

5.

Make sure the cap gasket is in place and screw the detector cap back on to the detector housing.

6.


NOTE: Allow the replacement sensor to warm up for 15 minutes before you continue with the next step.

7.


Versions” on page 40.

Replacing an ESM-01 Plug-in Sensor

1.


2.

Unscrew the detector cap from the detector housing body. Take care not to lose the cap gasket. If the splashguard begins to unscrew from the detector cap, make sure to remove the detector cap also. See Figure 8 for an illustration of the ESM-01 detector.

3.


4.

Carefully match the replacement sensor’s plug with the socket in the housing body and plug it in.

WARNING: The ESM-01 detectors cannot be changed from one type to another.

Replace the plug-in sensor only with the same type of ESM-01 sensor.

5.

Make sure the cap gasket is in place and screw the detector cap back onto the housing body. If the splash guard was unscrewed from the detector cap, screw it back onto the detector cap.

6.



NOTE: Allow the replacement sensor to warm up for 15 minutes before you continue with the next step.

7.


Versions” on page 40


Chapter 8: RS-485 Modbus Output

Overview

This chapter describes the M2’s RS-485 Modbus output and how to configure the M2 to make use of it. It also discusses how to wire the M2 into a Modbus system.

The M2 provides an RS-485 serial communications interface. It is a Modbus Slave Device, supporting 2-wire RS-485 Modbus RTU serial communications.

Wiring the M2 in a Modbus System

The M2 is a 2-wire Modbus RTU device. When wiring the M2 into a Modbus system, adhere to standard Modbus wiring practices per the Modbus Over Serial Line

Specification and Implementation Guide V1.0 or later. This document can be found online at www.modbus.org/specs.php.

The Modbus protocol supports a maximum of 247 unique slave addresses (1-247). The

M2’s line driver provides for up to 32 M2s to be connected together without the need for a repeater. Figure 30 & Figure 31 below illustrate typical M2 wiring configurations. If more than 32 M2s need to be connected together, RS-485 repeater(s) should be used such that no more than 32 M2s reside on any given network segment.

The MODBUS terminal strip is located on the terminal PCB (see Figure 9). The following signals are available at the Modbus terminal strip:

Table 10: Modbus Terminal Strip Signals

Modbus Terminal Label (RS-485

Name)

A

B

C

Modbus Signal Name

D0

D1

Common

Recommended Modbus Wiring

The recommended Modbus wiring for the M2 is illustrated in Figure 28 below. In this configuration, 5 wires are used for wiring the M2 into a Modbus system. Figure 28 also illustrates typical alarm device wiring.


Power Supply

24 VDC

See

Detector

Wiring

See

Detector

Wiring

To

Additional

M2s

Input

Terminals

Common

D

1

D

0

Modbus

Controller

Power Supply

24 VDC

Figure 28: Recommended Modbus Wiring

Alternate Modbus Wiring For Existing Installations

Although the wiring shown in Figure 28 is recommended, it is possible to wire the M2 into a Modbus system with only 4 wires in situations where a pre-existing system is being replaced and wiring is already in place. This should only be done if wiring for a system that is being replaced is already installed and it is not practical to run another wire. See

Figure 29 below for this wiring configuration. In this configuration, the wire between the

“C” terminal on the M2 and the Common terminal on the Modbus controller is omitted.

Instead, the Common terminal on the Modbus controller is connected to the “-” of the 24

VDC power supply.

See

Detector

Wiring

See

Detector

Wiring

To

Additional

M2s

Input

Terminals

Common

D

1

D

0

Modbus

Controller

Figure 29: Alternate Modbus Wiring


ID = 32

M2

Termination

Jumper

Installed

Termination Jumper

The M2 includes a 2-pin termination header (see Figure 9) that is used when the M2 is used in a Modbus system. Every M2 is supplied with a termination jumper (a jumper block) installed onto this header. If the M2 is not used in a Modbus system, this jumper has no function. When the M2 is installed in a Modbus system, this jumper must be installed in an M2 that is at the end of a Modbus line. Any M2 in a Modbus system that is not at the end of a line must have the termination jumper removed (see Figure 30 &

Figure 31 below).

Modbus

Master

M2

Termination

Jumper

Not Installed

ID = 31

RS-485

Up to 32 M2s can be connected without a repeater.

M2

Termination

Jumper

Not Installed

ID = 30

M2

Termination

Jumper

Not Installed

ID = 29

Figure 30: Multiple M2s in a Daisy Chain Configuration

RS-485

M2

Termination

Jumper

Not Installed

ID = 1

ID = 1

M2

Termination

Jumper

Installed

Modbus

Master

ID = 32

M2

Termination

Jumper

Installed

RS-485 RS-485

M2

Termination

Jumper

Not Installed

ID = 2

M2

Termination

Jumper

Not Installed

ID = 3

M2

Termination

Jumper

Not Installed

ID = 4

Up to 32 M2s can be connected without a repeater.

Figure 31: Multiple M2s in a Two Branch Configuration


M2

Termination

Jumper

Not Installed

ID = 31

52

Using the M2 in a 4-wire Modbus System

Although the M2 is a 2-wire Modbus RTU device, it can be used with a 4-wire Modbus controller if the system wiring is modified as follows:

• Connect the controller’s TxD0 and RxD0 wires together and use this connection as the

2-wire Modbus D0 signal.

• Connect the controller’s TxD1 and RxD1 wires together and use this connection as the

2-wire Modbus D1 signal.

• Connect these D0 and D1 signals and the common wire from the controller to the 2wire Modbus Network of M2s.

Modbus Mode

Modbus Mode allows you to configure various parameters relating to the Modbus setup of the M2. Modbus Mode includes a 5-minute time-out feature. If you do not press a control button for 5 minutes, the M2 automatically returns to normal operation.

NOTE: If the M2 returns to normal operation because of a time-out, it enters a warmup period just as it does when it is first turned on.

1.

While in normal operation, simultaneously press and hold the DOWN/NO and

ENTER buttons for 5 seconds to enter Modbus Mode. Release the buttons when the following screen appears.

Set Up

Modbus?

2.

To exit Modbus Mode, press and release the DOWN/NO button. The M2 will return to normal operation.

To continue in Modbus Mode, press and release the UP/YES button. The current

ENABLED/DISABLED setting will appear.

3.

If you want to change the currently displayed parameter, use the UP/YES and

DOWN/NO buttons to adjust it to the desired setting, then press ENTER to continue to the next parameter.

If the currently displayed parameter setting is OK, press the ENTER button to proceed to the next parameter.

Table 11 lists the M2 Modbus Mode parameters you can set. Table 11 also lists the factory set value for each parameter.


Modbus Mode Parameter

Enabled/Disabled

Slave ID

Baud Rate

Parity

Response Delay

Table 11: Configuration Parameters

Available Settings & Description

Can be set to ENABLED or DISABLED (factory setting).

Enables or disables the Modbus output.

The Slave ID can be set to values from 1 (factory setting) to 247.

The M2 will only receive messages from the Master which are addressed to this Slave ID (except for broadcast messages which are received by all slaves).

Can be set to 1200, 2400, 4800, 9600 (factory setting), 14440, &

19200.

EVEN (factory setting), ODD, NONE

The response delay can be set from 0 (factory setting) to 20 mS.

This is an optional additional delay inserted by the M2 prior to returning a response message to the Master. It may be helpful in some installations where the Master’s preparedness to receive responses might be delayed.

4.

When you have scrolled through all the adjustable parameters, SAVE IT? YES/NO appears on the display.

5.

If you do not wish to save the adjustments, press and release the DOWN/NO button.

The DO OVER? YES/NO message will display. Press and release the DOWN/NO button. The ABORT? YES/NO message will display. Press the UP/YES button to return to normal operation.

If you wish to change some of the adjustments made, press and release the DOWN/

NO button. The DO OVER? YES/NO message will display. Press and release the UP/

YES button. The Re-do MB Setup message will display and the M2 will return to the first adjustable parameter. Go back to step 3 and continue.

If you want to save the adjustments made, press and release the UP/YES button.

Modbus Saved is indicated on the display for a few seconds and the M2 returns to normal operation.

NOTE: All M2s on a Modbus network must be configured with the same baud rate and parity, and each M2 must have a unique slave ID. For an M2 to participate on a network, the ENABLED/DISABLED setting must be set to ENABLE.


Supported Modbus Functions

The M2 supports Function Code 03: Read Holding Registers and Function Code 16: Write

Registers. The register assignments detailed below were implemented in M2 firmware version 5.0. Please see revision B of the M2 manual if you have an M2 with a firmware version previous to 5.0.

Function Code 03: Read Holding Registers

There are a total of 40 registers available to be read via this Function Code.

Registers 1 - 2

The format (bit & field assignments) for registers 1 - 2 is shown below in Table 12 -

Table 13.

Table 12: Register 1, Numerical Reading with Sign & Decimal Point Bit & Field Assignments

[15]

[14:13]

[12:0]

Bit(s) Value & Field

Sign of Reading

0 = Positive

1 = Negative

Format of Reading

0 = XXX (no decimal point)

1 = XX.X

2 = X.XX

3 = .XXX

Numerical value of display reading (8000 max)

[15:12]

[11]

[10]

Table 13: Register 2, Operating State, Alarms & Relays Bit & Field Assignments

Bit(s) Value

Operating State

0 = Undefined

1 = Initialization

2 = Normal

3 = Warm-up

4 = Fail

5 = Calibration

6 = Post-Calibration

7 = Low Power

8 = Setup

Gas Type Change

0=Not Changed

1=Changed

Configuration Change

0=Not Changed

1=Changed


[9]

[8]

[3]

[2]

[1]

[0]

Table 13: Register 2, Operating State, Alarms & Relays Bit & Field Assignments (Continued)

Bit(s)

[7:6]

[5:4]

Value

Calibration Activity Flag

0=No Calibration Activity

1=Calibration Activity Has Occurred

Fail Status

0 = Fail Not Asserted

1 = Fail Asserted

Alarm 2 Status

0 = No Alarm

1 = Unacknowledged Alarm

2 = Acknowledged Alarm

3 = Unused Code

Alarm 1 Status

0 = No Alarm

1 = Unacknowledged Alarm

2 = Acknowledged Alarm

3 = Unused Code

Overscale Status

0 = Not Overscale

1 = Overscale

Fail Relay Status

0 = Not Energized

1 = Energized

Alarm 2 Relay Status

0 = Not Energized

1 = Energized

Alarm 1 Relay Status

0 = Not Energized

1 = Energized

Register 3

Register 3 is the supply voltage (0.1 volt per count).

Registers 4 - 11

The 16 bytes in these registers contain the same ASCII text information that is displayed on the M2’s LCD (not NULL Terminated).

Register 12

Register 12 is the range (full scale readout).

Register 13

Register 13 is the alarm 1 set point.

The decimal point location is the same as specified in Register 1.


57

Register 14



Registers 15 - 19

Registers 15 - 19 are the Gas Name ASCII String (NULL Terminated).

Registers 20 - 22

Registers 20 - 22 are the Gas Units String (NULL Terminated).

Register 23

Register 23 is the alarm 1 trigger.

0=Decreasing

1=Increasing

Register 24

Register 24 is the alarm 1 normal relay state.

0=Normally De-Energized

1=Normally Energized

Register 25

Register 25 is the alarm 1 relay reset.

0=Latching

1=Self-Resetting

Register 26

Register 26 is the alarm 1 ON delay.

Integer values are in seconds.

Register 27

Register 27 is the alarm 1 OFF delay.


Register 28


0=Decreasing

1=Increasing

Register 29

Register 29 is the alarm 2 normal relay state.



Register 30


0=Latching

1=Self-Resetting

Register 31




Register 32



Register 33

Register 33 is zero suppression.

Toxics and LEL: 0%-6% of full scale

Oxygen: 0%-0.7% Oxygen


Register 34

Register 34 is noise filter.

Integer values in seconds.

0-60 in 5 second increments.

Register 35

Register 35 is calibration timeout in minutes (5, 10, 15, 20, 25, or 30).

Register 36

Register 36 is calibration month (upper byte) and day (lower byte).

This is zero based (e.g. January=0 and the 1st=0).

Register 37

Register 37 is the calibration year.

Register 38

Register 38 is the calibration outcome.

Upper=Gas Operation

Lower=Air Operation

Calibration Outcome Codes:

1=Sensor Missing

2=Sensor Too Weak

3=Signal Too Strong

4=Not Enough Span

5=Negative Reading

6=Span Gas Value Is Not OK

7=Calculated Zero Is Too Low

8=Calculated Zero Is Too High

9=Zero Failure

10=Span Failure

11=Calibration Is Overscale

12=LEL Sensor Offset Is Too High

13=LEL Null Operation Failed

14=Operation Not Performed

Register 39

Register 39 is the auto-zero disable.

0=AutoZero Enabled

1=AutoZero Disabled


[2]

[3]

[0]

[1]

Register 40

Register 40 is the remote configuration register access level

0=None

1=Alarm Reset Only

2=All

Function Code 16: Write Registers

There are 21 registers in Function Code 16 that can be used to write to the M2. This manual only describes Register 16 because it can be used to reset an alarm condition. For a complete description of Function Code 16, request Appendix B from RKI Instruments, Inc.

Register 16

Register 16 performs the same functions as the buttons on the M2. Among other things, it is useful for remotely silencing alarms. With the M2 in an alarm condition, bit [0] can be used to silence it.

Table 14: Register 16, Button Function

NOTE: Register 40, the remote configuration register, must be set to 1 or 2 in order for

Register 16 to work.

Bit Value & Field

ENTER (also used for “Alarm Reset”)

0=Not Pressed

1=Pressed

DOWN/NO

0=Not Pressed

1=Pressed

UP/YES

0=Not Pressed

1=Pressed

HOLD Status

0=Button(s) Pressed and Released

1=Button(s) Pressed and Held


Parts List

07-0033RK

07-0125RK

07-0203RK

18-0405RK-01

18-0404RK

33-7101RK

45-6132RK

61-0140RK

61-0140RK-05

61-0190RK-CH4

61-0190RK-HC

61-0191RK-02

61-0191RK-03

61-0191RK-05

61-0191RK-10

61-0192RK-CH4

61-0198RK-02

61-0198RK-03

61-0198RK-05

61-0198RK-10

65-1025RK

65-2300RK-ASH3

65-2300RK-CL2

65-2300RK-NH3

Table 15 lists replacement parts and accessories for the M2 Transmitter.

Table 15: Parts List

Part Number

06-1248RK

Description

Calibration kit sample tubing (3/16 in. x 5/16 in.; specify length when ordering)

Cap gasket, for CSA type CO and H

2

S detector

Cap gasket, for ESM-01 detector

Rubber retaining boot for charcoal filter

Junction box w/o cover

Junction box cover, with lens

Charcoal filter disk

Termination jumper

LEL detector, catalytic type, UL version

LEL detector, catalytic type, CSA version

CH

4

LEL detector, IR type

HC LEL detector, IR type, propane calibration

CO

2

detector, IR type, 0 - 5,000 ppm

CO

2

detector, IR type, 0 - 5% volume

CO

2

detector, IR type, 0 - 50.0% volume

CO

2


CH

4


CO

2

detector, IR type, replaceable sensor, 0 - 5000 ppm

CO

2

detector, IR type, replaceable sensor, 0 - 5% volume

CO

2

detector, IR type, replaceable sensor, 0 - 50.0% volume

CO

2

detector, IR type, replaceable sensor, 0 - 100% volume

Plug-in oxygen sensor, for 65-2514RK

ESM-01 detector, 0 - 1.50 ppm arsine

ESM-01 detector, 0 - 3.00 ppm chlorine

ESM-01 detector, 0 - 75.0 ppm ammonia


61

Part Number

65-2300RK-NO

65-2300RK-PH3

65-2300RK-SO2

65-2423RK-05

65-2433RK-05

65-2494RK

65-2495RK

65-2496RK

65-2510RK

65-2511RK

65-2514RK

71-0107RK

81-0002RK-01

81-0002RK-03

81-0004RK-01

81-0004RK-03

81-0007RK-01

81-0012RK-01

81-0012RK-03

81-0013RK-01

81-0013RK-05

81-0064RK-01

81-0064RK-03

81-0070RK-01

81-0070RK-03

81-0072RK-01

81-0072RK-03

81-0073RK-01


Description

ESM-01 detector, 0 - 100 ppm nitric oxide

ESM-01 detector 0 - 1.00 ppm phosphine

ESM-01 detector, 0 - 6.00 ppm sulphur dioxide

H

2

S detector assembly, CSA version

CO detector assembly, CSA version

Oxygen detector assembly, non-explosion proof, replaceable sensor

H

2

S detector assembly, 0 - 100 ppm, non-explosion proof, replaceable sensor

CO detector assembly, 0 - 300 ppm, non-explosion proof, replaceable sensor

Oxygen detector, partial pressure type

Oxygen detector, capillary type

Oxygen detector, CSA version, capillary type

M2 Transmitter Operator’s Manual (this document)

Calibration cylinder, 50% LEL hydrogen in air, 34 liter steel

Calibration cylinder, 50% LEL hydrogen in air, 103 liter steel

Calibration cylinder, 50% LEL propane in air, 34 liter steel

Calibration cylinder, 50% LEL propane in air, 103 liter steel

Calibration cylinder, 15% LEL hexane in air, 34 liter steel

Calibration cylinder, 50% LEL methane in air, 34 liter steel

Calibration cylinder, 50% LEL methane in air, 103 liter steel

Calibration cylinder, 50% volume methane in nitrogen, 34 liter steel

Calibration cylinder, 50% volume methane in nitrogen, 58 liter steel

Calibration cylinder, CO, 50 ppm in air, 34 liter steel

Calibration cylinder, CO, 50 ppm in air, 103 liter steel

Calibration cylinder, CO

2

, 2,000 ppm in nitrogen, 34 liter steel


2

, 2,000 ppm in nitrogen, 103 liter steel


2

, 2.5% in nitrogen, 34 liter steel


2

, 2.5% in nitrogen, 103 liter steel


2

, 15% in nitrogen, 34 liter steel


Part Number

81-0073RK-03

81-0076RK-01

81-0076RK-03

81-0078RK-01

81-0078RK-03

81-0151RK-02

81-0151RK-04

81-0170RK-02

81-0170RK-04

81-0175RK-02

81-0175RK-04

81-0185RK-02

81-0185RK-04

81-0192RK-02

81-0192RK-04

81-1050RK

81-1051RK

81-1051RK-25

81-1103RK

81-1117RK

81-1138RK

81-1138RK-CL2

81-1138RK-NH3

81-1190RK

ES-1531-CO


Description


2

, 15% in nitrogen, 103 liter steel

Zero air calibration cylinder, 34 liter steel

Zero air calibration cylinder, 103 liter steel

Calibration cylinder, 100% nitrogen, 34 liter steel (used for setting oxygen zero)

Calibration cylinder, 100% nitrogen, 103 liter steel (used for setting oxygen zero)

Calibration cylinder, H

2

S, 25 ppm in nitrogen, 58 liter aluminum

Calibration cylinder, H

2

S, 25 ppm in nitrogen, 34 liter aluminum

Calibration cylinder, 5 ppm SO

2

in nitrogen, 58 liter

Calibration cylinder, 5 ppm SO

2


Calibration cylinder, 10 ppm NH

3


Calibration cylinder, 10 ppm NH

3


Calibration cylinder, 0.5 ppm PH3 in nitrogen, 58 liter

Calibration cylinder, 0.5 ppm PH3 in nitrogen, 34 liter

Calibration cylinder, 2 ppm Cl

2


Calibration cylinder, 2 ppm Cl

2


Regulator, with gauge and knob, 0.5 liter/minute continuous flow, for combustible gas, nitrogen, zero air, and CO cylinders.

Regulator, with gauge and knob, 0.5 liter/minute continuous flow, for H2S cylinder

Regulator, fixed flow, w/gauge & knob, 0.25 LPM, for 34 liter aluminum/58 liter/103 liter cylinder (Used to calibrate NH

3

ESM-

01 M2 only)

Calibration cup, for 3/4” NPT IR detectors, combustible gas and

CO

2

Calibration cup, for catalytic LEL, CO, H2S, and oxygen detectors

Calibration cup, general (SO

2

), for ESM-01, use 0.5 LPM flow

Calibration cup, for ESM-01 Cl2, use 0.5 LPM flow

Calibration cup, for ESM-01 NH3, use 0.25 LPM flow

Splashguard, for ESM-01 detector cap

CO sensor, plug-in


Part Number

ES-1537-H2S

ESM-015-NO

ESM-01DH-ASH3

ESM-01DH-D-SO2

ESM-0DH-PH3

ESM-01R-D-NH3

ESM-K01-D-CL2

NC-6205-01

NC-6205-05


Description

H2S sensor, plug-in

ESM-01 plug-in sensor, 0 - 100 ppm nitric oxide

ESM-01 plug-in sensor, 0 - 1.50 ppm arsine

ESM-01 plug-in sensor, 0 - 6.00 ppm sulphur dioxide, diffusion type only

ESM-01 plug-in sensor, 0 - 1.00 ppm phosphine

ESM-01 plug-in sensor, 0 - 75.0 ppm ammonia, diffusion type only

ESM-01 plug-in sensor, 0 - 3.00 ppm chlorine, diffusion type only

Hydrogen specific LEL detector, catalytic type, UL version

Hydrogen specific LEL detector, catalytic type, CSA version


Appendix A: Control Button Quick Reference Guide

The M2’s control buttons allow access to operational modes, resetting of alarms, and display of the Information Screen. Table 16 shows which button combinations perform these functions and which parameters are available for adjustment while in the operational modes. While in these modes, display prompts showing a “?” require you to respond by pressing either the UP/YES (for yes) or DOWN/NO (for no) button. To change parameter settings, use the UP/YES and DOWN/NO buttons to get the desired setting, then press and release the ENTER button to accept the setting.

Table 16: Control Button Quick Reference Chart

Mode Entered or

Function Performed

Alarm Reset

Show Information

Screen

Calibration Mode

Configuration Mode

Gas Type Mode

Modbus Mode

Button

Combination

Adjustable or Viewable Parameters

Press and

Release ENTER

Press and Hold

DOWN/NO

Press and Hold

UP/YES for 5 seconds

Press and Hold

UP/YES &

ENTER for 5 seconds n/a

• Input Voltage

• M2 Version/Revision Information

• Fresh Air Adjust

• Span (or Zero for Oxygen) Adjust with

Calibration Gas

• Alarm Levels

• Increasing or Decreasing Alarms

• Normally Energized or Normally Deenergized Relays

• Latching or Self-resetting Alarms

• Alarm On Delay

• Alarm Off Delay (if self-resetting)

• Zero Suppression

• Noise Filter

• Calibration Time-out Period

Gas Type Press and Hold

UP/YES and

DOWN/NO for

5 seconds

Press and Hold

DOWN/NO and

ENTER for 5 seconds

• Enable or Disable Modbus

• Slave ID

• Baud Rate

• Parity

• Response Delay


Appendix B: Function Code 16 Registers

The M2 supports Function Code 16 that allows writing to the M2. There are 21 registers in this Function Code. The register assignments detailed below were implemented in M2 firmware version 5.0. Please see revision B of the M2 manual if you have an M2 with a firmware version previous to 5.0.

Register 1


Value must be an integer. Any decimals are omitted.

Register 2


0=Decreasing

1=Increasing

Register 3

Register 3 is the alarm 1 relay state.



Register 4


0=Latching

1=Self-Resetting

Register 5


Integer value is in seconds.

Register 6



Register 7



The decimal point location is the same as specified in Register 1 of Function Code 03.

Register 8


0=Decreasing

1=Increasing

Register 9

Register 9 is the alarm 2 relay state.




[15:2]

[1]

[0]

Register 10


0=Latching

1=Self-Resetting

Register 11



Register 12



Register 13

Register 13 is the zero suppression.

Toxics and LEL: 0%-6% Full Scale

Oxygen: 0%-0.7% Oxygen


Register 14

Register 14 is the noise filter.

Integer value is in seconds (0-60 in 5 second increments).

Register 15

Register 15 is the calibration timeout.

Value is in minutes (5, 10, 15, 20, 25, or 30).

Register 16

Register 16 is explained in “Supported Modbus Functions” in the M2 manual.

Register 17

Register 17 is the calibration month (MSB) and day (LSB).

This is zero-based (e.g. January=0 and the 1st=0).

Register 18

Register 18 is the calibration year.

Register 19

Register 19 is for clearing change flags. When parameters are changed at the M2, a flag is raised at the controller. This register can be used to clear those flags.

Table 17: Register 19, Clear Change Flags

Bit(s) Value & Field

Unused

Write “1” to this bit to clear “Gas Type Changed” flag

Write “1” to this bit to clear “Configuration Changed” flag


Register 20

Register 20 is the AutoZero Disable.

0=AutoZero Enabled

1=AutoZero Disabled


RKI Instruments M2A Operator's Manual

Assistant Bot

M2 Transmitter

Operator’s Manual

Part Number: 71-0107RK

Revision: D

Released: 10/7/10

WARNING

Read and understand this instruction manual before operating instrument. Improper use of the gas monitor could result in bodily harm or death.

Product Warranty

Table of Contents

Chapter 1: Introduction

Overview

About the M2 Transmitter

About this Manual

Specifications

Chapter 2: Description

Overview

External Description

Junction Box

Magnetic Wand

Gas Detector

Detector Housing Body

Cap Gasket

Oxygen Sensor

Detector Housing Cap

Flame Arrestor

Guard

Internal Description

View With Cover and Control

PCB Removed

View with Cover Removed

Terminal PCB

Control PCB

Chapter 3: Installation & Startup

Overview

Mounting the M2 Transmitter

3.94

2.75

5.2

.25 Dia. Mounting

Hole, 2X

3/4 NPT Conduit

Hub

5.46

6.1

7.3 max

1.1

1.9 max

IR Detector

Wiring the M2 Transmitter

Green

White

Green

White

Green

White

Green

White

Black

Red

Black

See Chart

Start Up

Introducing Incoming Power

Adjusting the Fresh Air Reading

Chapter 4: Operation

Overview

Normal Operation

Information Screen

4 - 20 mA Signal Output Operation

Alarm Indications

Alarm 1 Condition

Alarm 2 Condition

Fail Condition

Low Power Alarm

Chapter 5: Configuration Mode

Overview

Viewing & Changing M2 Parameters

Chapter 6: Gas Type Mode