RKI Instruments M2 Bedienungsanleitung

65-2610RK-04

M2 Transmitter

Operator’s Manual

Part Number: 71-0294RK

Revision: 0

Released: 12/27/13

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65-2610RK-04 M2 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.

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65-2610RK-04 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:

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

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65-2610RK-04 M2 Transmitter Operator’s Manual

Table of Contents

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

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

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

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

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

Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

External Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Internal Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Chapter 3: Installation & Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Mounting the M2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Wiring the M2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Chapter 4: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Information Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4 - 20 mA Signal Output Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Chapter 5: Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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

Viewing & Changing M2 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Chapter 6: Gas Type Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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

Selecting the Gas Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

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65-2610RK-04 M2 Transmitter Operator’s Manual

Chapter 7: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

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

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

Replacing the Combustible Gas Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Chapter 8: RS-485 Modbus Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

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

Wiring the M2 in a Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Using the M2 in a 4-wire Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Modbus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Supported Modbus Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Appendix A: Control Button Quick Reference Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Appendix B: PLC and DCS Device Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Appendix C: Function Code 16 Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

(Appendix C available from RKI Instruments, Inc. Not included in manual as normally

provided with M2 detector head.)

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1 65-2610RK-04 M2 Transmitter Operator’s Manual

Chapter 1: Introduction

Overview

This chapter briefly describes the 65-2610RK-04 M2 Transmitter. This chapter also

describes the 65-2610RK-04 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.

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65-2610RK-04 M2 Transmitter Operator’s Manual 2

Specifications

Table 1 lists specifications for the M2.

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.

WARNING: M2 detector heads with firmware version 5.0 or later have a different

Modbus register assignment than M2s with previous versions of

firmware. If you are adding M2s with firmware version 5.0 or later to an

existing Modbus network installation, confirm what firmware version is

installed in the M2s already in the network and if necessary, take all steps

required to address the differences in Modbus register assignments. See

“Supported Modbus Functions” on page 41 for information on the current

Modbus register assignments. The firmware version is shown on the

Information Screen described on page 17.

Table 1: M2 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 4

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

Sampling Method Diffusion

Input Power 19 - 30 VDC

Controls • Three push button switches

• Three magnetic switches for non-intrusive calibration

Weight 5.5 lbs.

Signal Output • 4 to 20 mA, 500 ohms impedance max

• RS-485 Modbus

Operating Temperature -20°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 M2 Parameters” on page 22.

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3 65-2610RK-04 M2 Transmitter Operator’s Manual

Chapter 2: Description

Overview

This chapter describes the components of the M2 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 M2 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 M2 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 M2

transmitter.

Figure 1: M2 External Components

Magnetic

Wand

Terminal

Strip

3/4" NPT Conduit Hub

3/4" NPT ConduitHub

Detector

Junction Box

Calibration Adapter/

Splash Guard

Combustible Gas

Detector

M2 Junction Box

Window

Mounting Slot (2x)

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65-2610RK-04 M2 Transmitter Operator’s Manual 4

M2 Junction Box

The M2’s cast aluminum junction box protects the terminal PCB and wiring connections

made to the terminal PCB. Use the top 3/4’’ conduit hub to connect wiring from the

terminal PCB to external power and/or to an external device, typically an RKI controller.

Use the bottom 3/4” conduit hub to wire the remotely installed combustible gas detector.

Use the junction box’s two mounting slots 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.

Detector Junction Box

The detector junction box is intended to be installed remotely from the M2 junction box.

The combustible gas detector is factory installed in the bottom 3/4” NPT conduit hub

using a 3/4 in. x 1/2 in. 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 M2

junction box. This wiring should go through the top 3/4” 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 inch 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

inch 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 in. x 1/2 in. 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 M2

junction box is optimal for ease of calibration). The calibration adapter/splash guard also

protects the detector from splashing water or direct water spray.

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.

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5 65-2610RK-04 M2 Transmitter Operator’s Manual

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.

Figure 2: 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

Alarm 1 LED

Fail LED

TX LED

RX LED

Alarm 2 LED

UP/YES

ENTER

LCD Display

ENTER

DOWN/NO

Push Button

Control Switches

C NC NO

ALARM 1

LEL

R W G B

FAIL

C NC NO

PWR/SIG

- S +

Detector Terminal Strip

Power/Signal

Terminal Strip

Programming

Connector

(Factory Use)

Detector

Current Pot

(Factory

Adjust)

UP/YES

DOWN/NO

Termination

Jumper

View With Cover Removed

Modbus

Terminal Strip

View With Cover and

Control PCB Removed

Display

Ribbon Cable

Connector

3/4" NPT Conduit Opening

for Wire Entry

LEL PWR/SIG

RKI INSTRUMENTS

M2 TRANSMITTER

A B C

R S 485

A B C

RS485

ALARM 2

C NC NO

Relay

Terminal

Strips

Junction Box

Magnetic

Switches

Terminal PCB

Control PCB

3/4" NPT Conduit

Opening for

Detector J-Box

Wiring

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