RKI Instruments M2A Manuale utente

RKI Instruments, Inc.

www.rkiinstruments.com

M2A Transmitter

UL 2075 Version

Operator’s Manual

Part Number: 71-0379

Revision: P2

Released: 6/25/21

2M2A 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.

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:

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.

a) Absorbent cartridges d) Batteries

b) Pump diaphragms and valves e) Filter elements

c) Fuses

4M2A 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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

Mounting the M2A Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Wiring the M2A Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Chapter 4: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Information Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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

Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Chapter 5: Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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

Viewing & Changing M2A Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Chapter 6: Gas Type Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Selecting the Gas Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

M2A Transmitter Operator’s Manual 5

Chapter 7: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Calibration Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Replacing Components of the M2A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Appendix A: Control Button Quick Reference Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Appendix B: PLC and DCS Device Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

6M2A Transmitter Operator’s Manual

Chapter 1: Introduction

Overview

This chapter briefly describes the M2A Transmitter. This chapter also describes the 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 recording device.

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.

Three operating modes allow you to display and change setup and calibration settings and change the gas type.

They are Calibration Mode, Configuration Mode, and Gas Type 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.

M2A Transmitter Operator’s Manual 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 CH4: 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 4.5 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

Operating Temperature -40°C to 50°C

Accuracy ± 5% of reading or ± 2% of full scale (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 24.

8M2A Transmitter Operator’s Manual

Chapter 2: Description

Overview

This chapter describes external and internal components of the M2A Transmitter.

External Description

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

Figure 1: M2A External Components

Magnetic

Wand

Junction Box Cover

Detector

Window

Mounting Slot (2x)

3/4 NPT Conduit Hub, Plugged

3/4 NPT

Conduit Hub

M2A Transmitter Operator’s Manual 9

Junction Box

The M2A’s cast aluminum junction box is dust and weather resistant. The junction box also protects the M2A

and all connections made to it. Use the three 3/4 NPT conduit ports to mount the detector to the junction box

(factory installed in the bottom port) and connect wiring from an external device (left port). The top port 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 port can be used for wiring.

WARNING: If the top conduit port 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 15 for complete wiring

instructions.

Use the junction box’s two mounting holes 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.

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 NPT conduit port on the right bottom side of the

M2A. 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.

The IR detector has a replaceable plug-in sensor inside the detector housing. A sensor gasket seals the sensor

face to the detector housing cap.

Figure 2: Detector Component Location

Cap Gasket

Detector Housing Body

Flame Arrestor

Guard

Detector Housing Cap

Plug-In IR Sensor

10 M2A Transmitter Operator’s Manual

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 3: M2A 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 OLED display and a 4 - 20 mA signal (that is

proportional to the detection range). The 4 - 20 mA signal may be used by a recording device. 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 M2A. 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 M2A. On the combustible and CO2versions of the

M2A, a factory adjust pot just above the programming connector is used to set the detector current.

Control PCB

Junction Box

Terminal PCB

3/4 NPT Conduit

Opening for Wire Entry

M2A TRANSMITTER

RKI INSTRUMENTS

3/4 NPT Conduit Opening, Plugged

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