RKI Instruments 65-2643XL-05-04 Bedienungsanleitung

RKI Instruments, Inc.

www.rkiinstruments.com

65-2643XL-05-04

M2A-XL Transmitter

Operator’s Manual

Part Number: 71-0645

Revision: P1

Released: 11/16/23

2• 65-2643XL-05-04 M2A-XL 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. For most

applications, typical calibration frequencies are between 3 and 6

months but can be more often or less often based on your usage.

65-2643XL-05-04 M2A-XL 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 the 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. Parts must be returned to RKI Instruments, Inc. for repair or

replacement. 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 instruction manual. This warranty indicates the full extend 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 APARTICULAR 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 only 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. Warranty

covers parts and labor performed at RKI Instruments, Inc. only, and does not cover field labor or

shipment of parts back to RKI.

4• 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual

Table of Contents

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

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

About the M2A-XL Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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

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

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

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

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

Internal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Chapter 3: Installation & Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Mounting the M2A-XL Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Wiring the M2A-XL Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

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

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

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

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

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

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

Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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

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

Viewing & Changing M2A-XL Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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

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

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

65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual • 5

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

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

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

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Calibration Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

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

Replacing Components of the Oxygen Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

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

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

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

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

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

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

Chapter 9: Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Appendix A: Control Button Quick Reference Guide . . . . . . . . . . . . . . . . . . . . 58

Appendix B: PLC and DCS Device Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Appendix C: Function Code 16 Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

6• Overview 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual

Chapter 1: Introduction

Overview

This chapter briefly describes the 65-2643XL-05-04 M2A-XL Transmitter. This chapter also

describes the 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual (this document). Table 1

at the end of this chapter lists the specifications for the M2A-XL.

About the M2A-XL Transmitter

The M2A-XL 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-XL 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-XL 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-XL 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.

65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual Specifications • 7

Specifications

Table 1 lists specifications for the M2A-XL.

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

manual to assure proper and safe operation of the M2A-XL and to minimize the

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

XL as described in this manual.

Table 1: M2A-XL Specifications

Target Gas/Detection Range Oxygen: 0 - 25.0% volume, 0.1% increments

Alarm Settings (Alarm 1/

Alarm 2)*

19.5% volume (decreasing) / 23.5% volume (increasing)

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: 500 ohms impedance max

• -24 VDC: 1000 ohms impedance max

RS-485 Modbus

Operating Temperature -20°C to 45°C

Accuracy ± 0.5% O2

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

Mode. See “Viewing & Changing M2A-XL Parameters” on page 29.

8• Overview 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual

Chapter 2: Description

Overview

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

type detector head. It consists of the oxygen detector, calibration adapter/splash guard, terminal

PCB, the M2A-XL 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-XL

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-XL transmitter.

Figure 1: M2A-XL External Components

Magnetic

Wand

Window

M2A-XL

Junction Box

3/4 NPT

Conduit Hub

Oxygen Detector

Detector

Junction Box

Calibration Adapter/

Splash Guard

3/4 NPT Conduit Hub

Mounting Hole (2x) Terminal

Strip

65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual External Description • 9

M2A-XL Junction Box

The M2A-XL’s cast aluminum junction box is dust and weather resistant. The junction box also

protects the M2A-XL and all connections made to it. 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-XL Transmitter” on

page 18 for complete wiring instructions.

Use the junction box’s two mounting holes to mount the M2A-XL 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-XL junction box.

The oxygen detector is factory installed in the bottom 3/4 NPT conduit hub. 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-XL 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. A ground boss near the top conduit hub provides an external earth ground

connection.

10 • External Description 65-2643XL-05-04 M2A-XL Transmitter Operator’s Manual

Oxygen Detector

The oxygen detector consists of the detector housing body, detector housing cap, cap gasket, and

the plug-in sensor.

Figure 2: Oxygen Detector Component Location

Detector Housing Body

The detector housing body protects the electronic components within the housing. Use the

mounting threads at the top of the housing to screw the oxygen detector into the 3/4 NPT hub on

the bottom of the detector junction box. Two wires extend from the top of the detector housing

body. Use these wires to connect the oxygen detector to the terminal strip. One of the wires is

green and one of the wires is white.

The housing includes a two-socket pattern. This socket pattern accepts the sensor’s two pins to

secure the sensor within the detector housing. A pre-amplifier, located between the sockets and

two interconnect wires, conditions the sensor’s signal before the signal reaches the controller.

Housing Cap & Cap Gasket

The housing cap screws onto the detector housing. It retains the plug-in sensor and protects it

from damage. The housing cap also includes a flame arrestor which contains any sparks that may

occur within the detector and a flame arrestor guard which protects the flame arrestor from

damage. Unscrew the detector cap to access the plug-in sensor for maintenance or replacement. A

cap gasket seals the interface between the housing and cap. A flame arrestor guard is permanently

bonded to the cap.

Plug-In Oxygen Sensor

The sensor is secured within the detector assembly by the housing cap. Through a series of

chemical and electrical reactions, the sensor produces an electrical output that corresponds to the

detection range of the transmitter.

Flame Arrestor

Guard

Detector Housing Cap

Oxygen Sensor

Detector Housing Body

Cap Gasket

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