RKI Instruments 65-2640RK-03 Manuale utente

RKI Instruments, Inc.

www.rkiinstruments.com

65-2640RK-03

M2A Transmitter

Operator’s Manual

Part Number: 71-0332

Revision: F

Released: 8/28/20

2 65-2640RK-03 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.

65-2640RK-03 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

4 65-2640RK-03 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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

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

Wiring the M2A Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Chapter 4: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Information Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4 - 20 mA Signal Output Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Chapter 5: Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

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

Viewing & Changing M2A Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Chapter 6: Gas Type Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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

Selecting the Gas Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

65-2640RK-03 M2A Transmitter Operator’s Manual 5

Chapter 7: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Calibration Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Replacing the Combustible Gas Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Chapter 8: RS-485 Modbus Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Wiring the M2A in a Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Using the M2A in a 4-wire Modbus System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Modbus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Supported Modbus Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Chapter 9: Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Appendix A: Control Button Quick Reference Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Appendix B: PLC and DCS Device Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Appendix C: Function Code 16 Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

6 65-2640RK-03 M2A Transmitter Operator’s Manual

Chapter 1: Introduction

Overview

This chapter briefly describes the 65-2640RK-03 M2A Transmitter. This chapter also describes the 65-2640RK-

03 M2ATransmitter 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.

65-2640RK-03 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 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 27.

8 65-2640RK-03 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, 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

3/4 NPT Conduit Hub

Magnetic

Wand

Terminal

Strip

3/4 NPT Conduit

Hub, Plugged

M2A

Junction

Box

Combustible Gas

Detector

Junction Box

3/4 NPT

Conduit Hub

Calibration Adapter

3/4 NPT

Conduit Hub

Mounting Slot (2x)

Window

65-2640RK-03 M2A Transmitter Operator’s Manual 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 M2ATransmitter” on page 16 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. 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

A calibration adapter is installed on the combustible gas detector. A fitting at the bottom of the calibration

adapter 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).

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.

10 65-2640RK-03 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 2: 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, 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 M2A 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 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. 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 forWireEntry

M2A TRANSMITTER

RKI INSTRUMENTS

3/4 NPT Conduit Opening, Plugged

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