RKI Instruments 65-2640XL-04 Manuel utilisateur

RKI Instruments, Inc.

www.rkiinstruments.com

65-2640XL-04

M2A Transmitter

Operator’s Manual

Part Number: 71-0611

Revision: P1

Released: 10/20/22

2• 65-2640XL-04 M2A Transmitter Operator’s Manual

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.

65-2640XL-04 M2A Transmitter Operator’s Manual • 3

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:

• Absorbent cartridges

•Fuses

• Pump diaphragms and valves

•Batteries

• 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 APARTI CULAR PURPOSE. INNO

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.

4• 65-2640XL-04 M2A Transmitter Operator’s Manual

Table of Contents

Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

About the M2A Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

External Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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

Chapter 3: Installation & Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Mounting the M2A Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Wiring the M2A Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Chapter 4: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Information Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4 - 20 mA Signal Output Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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

Chapter 5: Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Viewing & Changing M2A Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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

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

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

65-2640XL-04 M2A Transmitter Operator’s Manual • 5

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

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

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

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Calibration Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Replacing the Combustible Gas Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Chapter 8: RS-485 Modbus Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Wiring the M2A in a Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Using the M2A in a 4-wire Modbus System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Modbus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Supported Modbus Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Chapter 9: Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Appendix A: Control Button Quick Reference Guide . . . . . . . . . . . . . . . . . . . . 57

Appendix B: PLC and DCS Device Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Appendix C: Function Code 16 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

6• Chapter 1: Introduction 65-2640XL-04 M2A Transmitter Operator’s Manual

Chapter 1: Introduction

Overview

This chapter briefly describes the 65-2640XL-04 M2A Transmitter. This chapter also describes

the 65-2640XL-04 M2A Transmitter Operator’s Manual (this document). Table 1 at the end of this

chapter lists the specifications for the M2A.

About the M2A Transmitter

The M2A 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 M2A displays the current gas reading on an OLED 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

M2A 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 M2A 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.

65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 1: Introduction • 7

Specifications

Table 1 lists specifications for the M2A.

WARNING: When using the M2A, you must follow the instructions and warnings in this

manual to assure proper and safe operation of the M2A and to minimize the risk

of personal injury. Be sure to maintain and periodically calibrate the M2A as

described in this manual.

Table 1: M2A Specifications

Target Gas/Detection Range Combustible Gas (methane calibration standard):

0 - 100% LEL, 1% LEL increments

Alarm Settings (Alarm 1/Alarm 2)* 10% LEL/50% LEL

Construction (housing) Explosion-proof Junction Box, NEMA 4X

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

Sampling Method Diffusion

Input Power 10 - 30 VDC

Controls • Three push button switches

• Three magnetic switches for non-intrusive calibration

Weight 5.5 lbs.

Signal Output

• 4 to 20 mA with impedance maximums listed below

-12 VDC input: 500 ohms impedance max

-24 VDC input: 1000 ohms impedance max

• RS-485 Modbus

Operating Temperature -40°C to 50°C

Accuracy ± 5% of reading or ± 2% LEL (whichever is greater)

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

“Viewing & Changing M2A Parameters” on page 29.

8• Chapter 2: Description 65-2640XL-04 M2A Transmitter Operator’s Manual

Chapter 2: Description

Overview

This chapter describes the components of the M2A transmitter. The transmitter is a 4 - 20 mA

type detector head. It consists of the combustible gas detector, calibration adapter/splash guard,

terminal PCB, the M2A junction box, and the detector junction box. The two junction box

configuration is intended for situations where the detector needs to be installed at an inaccessible

location. The detector junction box can be installed at the inaccessible location and the M2A

junction box can be installed in a more readily accessible area.

External Description

This section describes the junction boxes and all external components of the M2A transmitter.

Figure 1: M2A External Components

Terminal

Strip

M2A-XL

Junction

Box

Mounting Hole (2x)

3/4 NPT Conduit Hub

Magnetic

Wand

3/4 NPT

Conduit Hub

3/4 NPT

Conduit Hub

Calibration Adapter/

Splash Guard

Combustible Gas

Detector

Junction Box

Window

65-2640XL-04 M2A Transmitter Operator’s Manual Chapter 2: Description • 9

M2A Junction Box

The M2A’s cast aluminum junction box protects the terminal PCB and wiring connections made

to the terminal PCB. Use the three 3/4 NPT conduit hubs to wire the remotely installed

combustible gas detector and connect wiring from an external device, typically an RKI controller.

The top hub is shipped with a factory installed and sealed conduit plug to avoid leaks into the

junction box. If necessary, the conduit plug can be removed and the top hub can be used for

wiring.

WARNING: If the top conduit hub is used for wiring, be sure to seal the threads to ensure

water does not enter the junction box. See “Wiring the M2A Transmitter” on

page 17 for complete wiring instructions.

Use the junction box’s two mounting slots to mount the M2A 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

OLED 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.

Detector Junction Box

The detector junction box is intended to be installed remotely from the M2A junction box. The

combustible gas detector is factory installed in the bottom 3/4 NPT conduit hub using a 3/4 x 1/2

NPT reducer. A terminal strip is provided for wiring connections and the detector is factory wired

to one side of this terminal strip. The other side of the terminal strip is for user-supplied wiring to

the detector terminal strip located in the M2A junction box. This wiring should go through the top

3/4 NPT conduit hub. Three spacers installed on the back of the junction box controls the distance

of the junction box from a mounting surface.

Combustible Gas Detector

The combustible gas detector is a catalytic type detector that produces an electrical output that

corresponds to the detection range. It is packaged in a 1/2 NPT nipple with a sintered metal flame

arrestor on one end allowing ambient air to diffuse into the detector. The flame arrestor also

contains any sparks which may occur within the detector. The 1/2 NPT mounting threads at the

top of the detector allow you to mount it into the bottom conduit hub of the junction box. The

junction box conduit hub is 3/4 NPT, so a 3/4 x 1/2 NPT reducer is used to install the combustible

gas detector. A rainshield screws onto the bottom of the detector (flame arrestor end). The

rainshield helps protect the detector from rain and debris in the monitoring environment. Four

color-coded leads extend from the top of the detector. The leads allow you to connect the detector

to the terminal strip.

Calibration Adapter/Splash Guard

A calibration adapter/splash guard is installed on the combustible gas detector. A fitting at the

bottom of the calibration adapter/splash guard allows a length of tubing to be connected for

calibration and routed to a more easily accessible location (near the M2A junction box is optimal

for ease of calibration). The calibration adapter/splash guard also protects the detector from

splashing water or direct water spray.

10 • Chapter 2: Description 65-2640XL-04 M2A Transmitter Operator’s Manual

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.

Internal Description

This section describes the internal components of the M2A. The internal components of the M2A

include the terminal PCB which provides for all the wiring connections to the M2A and the

control PCB which displays the gas reading and has the control buttons.

Figure 2: M2A Internal Components

Control PCB

Terminal PCB

M2A-XL TRANSMITTER

Junction Box

3/4 NPT Conduit Opening

3/4 NPT Conduit

Opening for Wire Entry RKIINSTRUMENTS

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