RKI Instruments 30-0954RK-209D Owner's manual

www.rkiinstruments.com

30-0954RK-209D Series Sample Draw

Aspirator Adapter

with M2As for CH

4

(%Volume) and H

2

S

Operator’s Manual

Part Number: 71-0339

Revision: D

Released: 8/28/20

2 • 30-0954RK-209D Series Sample Draw Aspirator Adapter

WARNING

Read and understand this instruction manual before operating detec-

tor. Improper use of the detector could result in bodily harm or death.

Periodic calibration and maintenance of the detector is essential for

proper operation and correct readings. Please calibrate and maintain

this detector 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.

30-0954RK-209D Series Sample Draw Aspirator Adapter • 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:

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 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 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.

a) Pump diaphragms and valves c) Batteries

b) Fuses d) Filter elements

4 • 30-0954RK-209D Series Sample Draw Aspirator Adapter

Table of Contents

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

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

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Aspirator Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

M2A Series H

2

S and CH

4

Detector Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Chapter 3: Installation and Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Making Tubing Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Chapter 4: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

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

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Information Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4-20 mA Signal Output Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Chapter 5: Configuration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Viewing and Changing M2A Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Chapter 6: Gas Type Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Selecting the Gas Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Chapter 7: Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Calibration Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Blowback Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Setting the Drain Fault Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Replacing Components of the Aspirator Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

30-0954RK-209D Series Sample Draw Aspirator Adapter • 5

Chapter 8: RS-485 Modbus Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Wiring the M2A in a Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Using the M2A in a 4-Wire Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Modbus Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Supported Modbus Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Appendix A: Control Button Quick Reference Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Appendix B: PLC and DCS Device Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Appendix C: Function Code 16 Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6 • 30-0954RK-209D Series Sample Draw Aspirator Adapter

Chapter 1: Introduction

Overview

This manual describes the 30-0954RK-209D Series sample draw aspirator adapter supplied with an

M2A for 0 - 100 %volume CH

4

and an M2A for 0 - 100 ppm H

2

S. The 30-0954RK-209D may be used

with a variety of detector heads. This manual describes the %volume CH

4

/H

2

S M2A combination. It

also describes how to install, use, and maintain the adapter. A spare parts list at the end of this manual

lists replacement parts.

Specifications

Table 1 lists specifications for the Sample Draw Aspirator Adapter.

WARNING: When using the 30-0954RK-209D Series, you must follow the instructions and

warnings in this manual to assure proper and safe operation of the 30-0954RK-209D

Series and to minimize the risk of personal injury. Be sure to maintain and calibrate

the 30-0954RK-209D Series as described in this manual.

Table 1: Specifications

Target Gas/Detection Range •Methane (CH

4

): 0 - 100 % volume, 1% increments

• Hydrogen Sulfide (H

2

S): 0 - 100 ppm, 1 ppm increments

Alarm Settings (Alarm 1/Alarm 2) • Methane: 100 %volume / 100 %volume

• Hydrogen Sulfide: 10 ppm / 50 ppm

Input Power 19 - 30 VDC

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

• RS-485 Modbus

Maximum Compressed Air Supply

Pressure

140 PSI

Outlet Pressure to Aspirator 5 - 50 PSI adjustable (determined by required flow rate)

Recommended Sample Flow Rate 3 SCFH (standard cubic feet per hour)

Recommended H

2

S Detector Dilution

Flow Rate

0.6 SCFH (standard cubic feet per hour)

Low Flow Setpoint 0.6 SCFH (standard cubic feet per hour)

Accuracy IR CH

4

:

± 5% of reading or ± 2% of full scale (whichever is greater)

Hydrogen Sulfide

:

± 5% of reading or ± 2 ppm H

2

S (whichever is greater)

30-0954RK-209D Series Sample Draw Aspirator Adapter • 7

Chapter 2: Description

Overview

This version of the 30-0954RK-209D sample draw aspirator adapter consists of an aspirator panel with

a 65-2645RK-05 M2A series H

2

S detector and a 65-2658RK-CH4 M2A series methane detector

installed. Fresh air dilution is used for the sample going to the H

2

S detector. The sample draw aspirator

adapter uses compressed air flowing through a venturi to draw air into a sample chamber for each

detector. A flow diagram for the system is shown below.

Figure 1: Flow Diagram

Compressed

Air In

(Vacuum

Port)

Atmosphere

Air In

Particle

Filter

Dilution Flow Meter

H2S Detector

Sample

Inlet/Blowback

Valve

V

Drain

Fault

Switch

Flow

Fail

Switch

Sample Flow Meter

Calibration Gas

Fitting

Calibration

Valve

Water

Trap

CH4 Detector

Restrictor

AspiratorRegulator

Exhaust

8 • 30-0954RK-209D Series Sample Draw Aspirator Adapter

Aspirator Panel

The sample draw adapter consists of fourteen major components (see Figure 2): the detector heads

(described in “M2A Series H

2

S and CH

4

Detector Heads” on page 11), regulator, aspirator, detector

adapter, detector chambers, sample flowmeter, H

2

S dilution flowmeter, particle filter, calibration

valve, inlet/blowback valve, water trap, low flow switch, drain fault switch, and low flow and drain

fault contact housing.

Figure 2: Component Location

Detector Heads

Figure 2 above shows the location of the two detector heads. Please see “M2A Series H

2

S and CH

4

Detector Heads” on page 11 for a complete description of the detector heads.

Adjustment

Screw

Calibration

Valve

Push Button

Calibration

Valve

Water Trap

Inlet/Blowback

Valve

H2S M2A

Detector

Head

H2S Dilution

FlowMeter

Low Flow

Switch

Sample Flow

Meter

Low Flow

and Drain

Fault

Contact

Housing

Particle Filter

(not factory

installed)

Calibration

Fitting

1/4 O.D. Tube

Compressed

Air Inlet Fitting

Inlet/Blowback Valve Button

1/4 O.D. TubeAspirator/

Sample Exhaust Fitting

IR CH4 M2A

Detector

Head

Drain

Fault

Switch

H2S Dilution

FlowMeter

Inlet Hose

Barb

Pressure AdjustmentKnob

Pressure Regulator

Aspirator

Pressure Gauge

1/4 O.D. TubeSample Inlet Fitting

30-0954RK-209D Series Sample Draw Aspirator Adapter • 9

Regulator

The regulator has an inlet port on its left side with a 1/4” tube fitting. The maximum allowable inlet

pressure is 140 PSI. A gauge at the bottom of the regulator indicates the output pressure. The output

pressure, and detector flow, can be adjusted using the knob on the front of the regulator. The detector

flow rises or falls as the output pressure is increased or decreased.

Aspirator

The aspirator inlet is connected to the output port on the right side of the regulator and the vacuum port

on top is connected to the detector chamber. It has a venturi orifice inside it which generates a vacuum

at its top port when compressed air flows through it. The compressed air and the air drawn from the

detector chamber into the top port of the aspirator both exhaust at the right side of the aspirator.

Detector Adapter

The infrared (IR) CH

4

detector and the H

2

S detector each have a detector adapter screwed onto the

bottom of the detector. The detector adapters are installed hand tight and have a gasket inside that seals

against the detector. When removing the detector adapter to change the detector, be sure not to lose this

gasket. The IR CH

4

and H

2

S detectors each require their own specific detector adapter. The IR CH

4

detector adapter cannot be installed on the H

2

S detector and vice versa.

Detector Chamber

Each detector has a detector chamber. The chamber has three thumbscrews which fasten it to the

detector adapter. An O-ring at the top of the chamber seals the chamber/adapter interface. The inlet of

each chamber is on the side and the exhaust of each chamber is on the bottom. The IR CH4 detector’s

inlet is connected to the exhaust of the sample flowmeter. The IR CH

4

sensor’s exhaust is routed to the

inlet of the H

2

S detector’s chamber. The exhaust of the H

2

S detector’s chamber is connected to the

vacuum port of the aspirator.

Sample Flowmeter

The flowmeter indicates the flow to the IR CH

4

detector. It has a 1/4” OD tube fitting at its inlet and

exhaust port. The exhaust port of the flow meter is connected to the IR CH

4

detector’s detector

chamber. The flowmeter’s indication range is 0.5 - 5 SCFH. It has no flow adjustment valve because

the flowrate is controlled by the regulator setting.

H

2

S Dilution Flowmeter

The H

2

S dilution flowmeter indicates the flow rate of fresh air entering the sample stream. It has a 1/4”

OD tube fitting at its exhaust port. The exhaust port of the flowmeter is connected to the sample line

before it enters the H

2

S detector’s detector chamber. The H

2

S dilution flowmeter’s inlet port has a hose

barb fitting installed. The H

2

S dilution flowmeter’s indication range is 0 - 1.0 SCFH and it has a flow

adjustment valve. The flow to the H

2

S detector is the sum of the sample flow and the dilution flow.

Particle Filter

A particle filter with a piece of gray tubing on each end is shipped with the aspirator adapter but is not

factory installed. The particle filter must be attached to the H

2

S dilution flowmeter’s inlet port using

the gray tubing during installation. If tubing from a fresh air area needs to be routed to the particle

filter, that fresh air line can be connected to the gray tubing on the open end of the particle filter or the

gray tubing can be removed and the fresh air line can be connected directly to the open end of the

particle filter. If the particle filter gets clogged, the flowrate through the flowmeter will decrease. The

10 • 30-0954RK-209D Series Sample Draw Aspirator Adapter

flowrate should be monitored, as a change in flowrate will affect the accuracy of the H

2

S reading.

Calibration Valve

The calibration valve is a manual operation spring return valve with a push button actuator. This valve

is used to switch from sample flow to calibration gas during the calibration process. When the button is

pushed and held, the sample port is closed and the calibration port is opened.

Inlet/Blowback Valve

The inlet/blowback valve is a manual operation spring return valve. A push button actuator is located

on the front of the valve. This valve is used to switch from sample flow to blow back in the event of a

clogged sample line. When the push button is pressed and held, the valve diverts the compressed air

supply back through the sample line to clear obstructions.

WARNING: The blowback pressure can be as high as 140 PSI. Make sure that all personnel and

equipment are clear of the sample line inlet end to avoid personal injury or equipment

damage if a sample line obstruction is blown out of the sample line.

Water Trap

The water trap prevents water from entering the flow system and is self-draining.

Low Flow/Drain Fault Contact Housing

The low flow switch provides open contacts in normal operation in the low flow/drain fault contact

housing that close in the event of a low flow condition. Two contact wires protrude from the side of the

switch and enter the low flow contact housing through a plastic cable bushing on the left side of the

housing. Terminals are provided in the low flow/drain fault contact housing for field connection to the

switch contacts.

The drain fault switch senses a break or very low flow in the water drain line and provides open

contacts in normal operation in the low flow/drain fault contact housing which close when the switch

senses a break, a very low drain flow, or a shut down.

Connecting monitoring devices to the low flow and drain fault contact terminals provides the user with

a notification of a contact closure. Each set of contacts may have their own monitoring device or they

may share one. See “Installation” on page 19 for instructions to wire these terminals using the two

scenarios.

A second plastic cable bushing on the bottom of the low flow/drain fault contact housing allows for

cable entry to the housing. The size range of the cable which can be routed through the second cable

bushing is .064’’ - .210’’ OD.

30-0954RK-209D Series Sample Draw Aspirator Adapter • 11

M2A Series H

2

S and CH

4

Detector Heads

This section describes the external and internal components of the M2A series H

2

S and CH

4

detector

heads that are installed on this version of the 30-0954RK-209D aspirator panel. Other versions may

have different detectors installed.

External Description

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

Figure 3: M2A External Components, IR CH

4

Detector

Magnetic

Wand

Junction Box Cover

3/4 NPT Conduit Port, Plugged

3/4 NPT

Conduit Port

Mounting Slot (2x)

Window

IR CH4 Detector

12 • 30-0954RK-209D Series Sample Draw Aspirator Adapter

Figure 4: M2A External Components, H

2

S Detector

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” on page 20 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.

Magnetic

Wand

Junction Box Cover

3/4 NPT Conduit Port, Plugged

3/4 NPT

Conduit Port

Mounting Slot (2x)

Window

H2S Detector

30-0954RK-209D Series Sample Draw Aspirator Adapter • 13

Infrared (IR) CH

4

Detector

An IR CH

4

detector is generally used instead of the catalytic combustible detector in applications

where there may be catalyst poisons such as silicone present or where oxygen is not present in the

monitoring environment.

The IR CH

4

detector is made up of a miniature infrared methane %volume detector housed and

encapsulated in a pipe nipple. The pipe nipple has 3/4 NPT threads on each end and a 1 1/4” hex that

allows removal or installation of the detector with a wrench. A porous flame arrestor that is coated

with a hydrophobic film that repels liquids is on one end of the detector and allows sample gas to enter

the detector. Four color coded leads, red, white, green, and black, extend from the other end of the

detector. The leads allow you to connect the detector to the amplifier.

H

2

S Detector

The H

2

S detector has a replaceable plug-in sensor inside the detector housing. A rubber boot and a

spacer help ensure that the sensor remains plugged into the detector housing body.

Figure 5: H

2

S Detector Component Location

Spacer

Rubber Boot

H2S Plug-inSensor

Flame

Arrestor

Guard

Detector

Housing Cap

Detector HousingBody

Cap Gasket

14 • 30-0954RK-209D Series Sample Draw Aspirator Adapter

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 6: 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 is 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 M2A to a Modbus network.

The terminal PCB also controls three relays: one fail and two gas alarm.

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 CO

2

versions of the M2A, a factory adjust pot just above the

NO

Control PCB

Junction Box

Terminal PCB

3/4 NPT Conduit

Opening for Wire Entry

M2A TRANSMITTER

RKIINSTRUMENTS

3/4 NPT Conduit Opening, Plugged

30-0954RK-209D Series Sample Draw Aspirator Adapter • 15

programming connector is used to set the detector current.

Figure 7: Terminal PCB Component Location

Power/Signal Terminal Strip

The power/signal terminal strip is a three position plug-in style terminal strip located at the top of the

left terminal column. It is used to connect 24 VDC power to the M2A and to connect the 4 - 20 mA

output signal to a device.

The signal output, the S terminal, does not have to be connected for the M2A to function. The S

terminal is used if you want to connect the 4 - 20 mA output signal to another device such as a gas

monitoring controller, chart recorder, or programmable controller (PLC).

Detector Terminal Strip

The detector terminal strip is a four position plug-in style terminal strip and is the middle terminal strip

in the left terminal column. For the IR CH

4

detector, all four terminals are used to connect the detector

to the M2A. For the H

2

S detector, only two of the terminals are used for connecting a detector.

Figure 8: Detector Terminal Strip

- S +

A B C

RS 485 PWR/SIG

R W G B

LEL

C NC NO

ALARM 1

C NC NO

ALARM 2

C NC NO

FAIL

Modbus Terminal Strip

Ground Jumper

Programming Connector

(Factory Use)

Power/Signal Terminal Strip

Termination Jumper

Ribbon Cable Connector

Detector Current Adjust Pot

(Comb/CO2 Type Only, Factory Adjust)

Detector Terminal Strip

(Comb/CO2 Version Shown)

Relay

Terminal

Strips

H2S

Detector

Terminal

Strip

IR CH4

Detector

Terminal

Strip

C NC NO

ALARM 1

C NC NO

ALARM 2

C NC NO

FAIL

- S +

A B C

RS 485 PWR/SIG

R W G B

LEL

C NC NO

ALARM 1

C NC NO

ALARM 2

C NC NO

FAIL

- S +

PWR/SIG

TOXIC OXY

+ - + -

RS 485

A B C

16 • 30-0954RK-209D Series Sample Draw Aspirator Adapter

NOTE: The detector is factory-wired to the M2A. See “Wiring” on page 20 for all wiring procedures

related to M2A.

Modbus Terminal Strip

The Modbus terminal strip is a three position plug-in style terminal strip and is the bottom terminal

strip in the left terminal column. It allows connection of the M2A into a Modbus network.

Relay Terminal Strips

The right column of terminal strips consists of, from top to bottom, the fail, alarm 1, and alarm 2 relay

terminal strips. They are three-position plug-in style terminal strips. The relay terminal strips are used

to connect devices such as lights and horns that are controlled by the relay contacts. The relay contacts

are rated at 115 VAC, 5 amps. The relay contacts may also be used to control higher rated relays.

Termination Jumper

A two pin header with a termination jumper installed is located below the Modbus terminal

strip. The jumper has no function unless the M2A is wired into a Modbus installation. See

“Chapter 8: RS-485 Modbus Output” on page 50 for a description of using the M2A in a

Modbus system.

Ground Jumper

A two pin header with a jumper installed is located along the left side of the terminal PCB. Leave this

jumper installed unless directed to remove it for a Modbus installation. See “Chapter 8: RS-485

Modbus Output” on page 50 for a description of using the M2A in a Modbus system.

Control PCB

The LCD display and control switches are located on the control PCB. It is installed on top of the

terminal PCB by lining up its three spacing standoffs with the banana jacks in the terminal PCB

mounting standoffs and pushing it onto the banana jacks. The jacks retain the control PCB.

Figure 9: Control PCB Component Location

ENTER

DOWN/NO

UP/YES

Push Button

Control

Switches

Magnetic Switches

ENTER

UP/YES

DOWN/NO

Alarm 1 LED

Alarm 2 LED

Fail LED

RX LED

TX LED

M2A TRANSMITTER

RKI INSTRUMENTS

OLED Display

30-0954RK-209D Series Sample Draw Aspirator Adapter • 17

LCD Display

The LCD display is located at the top of the control PCB. It indicates the current gas reading and

displays messages and parameters in the M2A’s programs.

Control Buttons

The M2A includes three push button switches that allow you to enter the M2A’s operating modes,

navigate through the modes, update settings, and save changes to the settings. The push button

switches are located along the bottom edge of the control PCB (see Figure 9). The UP/YES button is

on the left, the DOWN/NO button is in the middle, and the ENTER button is on the right.

Just above each push button switch is a magnetic switch with the same function as the push button

switch below it. The magnetic switches are for use in non-intrusive calibration. They are actuated by

bringing the magnetic wand close enough to them to actuate them. Although the magnetic switches

have the same functions as the push button switches, it is not practical to use them for operations other

than calibration because it is not possible to actuate two magnetic switches at once with only one

magnetic wand. Since displaying the Information Screen only requires the use of one switch, the wand

may be used to show the Information Screen (see “Information Screen” on page 27).

Status LEDs

The M2A includes five status LEDs that are located above the display (see Figure 9).

• Fail LED

The fail LED turns on when the M2A is experiencing a fail condition. A fail condition can be

caused by a detector failure or low detector signal.

• Alarm 1 LED

The alarm 1 LED is on when the M2A is experiencing an alarm 1 condition.

• Alarm 2 LED

The alarm 2 LED is on when the M2A is experiencing an alarm 2 condition.

Table 2: M2A Control Button Functions

Switch Function

UP (YES) • Saves settings

• Changes the displayed setting

• Enters the Calibration Program

• Enters Gas Type Mode (press with DOWN/NO button)

• Enters Configuration Mode (press with ENTER button)

DOWN (NO) • Cancels setting changes

• Changes the displayed setting

• Enters Gas Type Mode (press with UP/YES button)

• Enters Modbus Mode (press with ENTER button)

• Displays the Information Screen

ENTER • Initiates operations

• Enters Configuration Mode (press with UP/YES button)

• Enters Modbus Mode (press with DOWN/NO button)

• Functions as an alarm reset switch

18 • 30-0954RK-209D Series Sample Draw Aspirator Adapter

• RX & TX LED’s

These LED’s indicate data being received (RX) and transmitted (TX) when the M2A’s Modbus

output is operating.

30-0954RK-209D Series Sample Draw Aspirator Adapter • 19

Chapter 3: Installation and Startup

Overview

This section describes installation and startup procedures for the sample draw aspirator adapter.

Installation

Figure 10: Outline & Mounting Dimensions

1. Install the mounting panel to a flat vertical surface using the four mounting holes (0.50’’ diameter)

in the corners of the panel. Make sure that sufficient space is allowed to remove the detector head’s

cover, and to bring power/signal wiring to the detector head. Also provide sufficient clearance for

routing of sample, compressed air, and exhaust lines.

+

-

Sample Inlet

Field Wiring Cable

Entry Bushing for

SwitchContact

0.75

(4X) Ø 0.50

0.75

Low Flow and Drain Fault

Contact Housing

Aspirator/Sample Exhaust

19.25

20.75

19.25

20.75

140 PSICompressed

AirInlet

20 • 30-0954RK-209D Series Sample Draw Aspirator Adapter

Wiring

WARNING: Always verify that the power source is OFF before making any wiring connections.

1. Remove the junction box cover.

2. Grasp the control PCB by its edges.

3. Gently pull until the control PCB is pulled away from the banana jacks. Take care not to pull too

hard and damage the cable which connects the control and terminal PCB’s.

4. Let the control PCB hang by the cable. The terminal strips are now visible on the terminal PCB.

The control PCB may be left hanging while wiring is done. If desired, the control PCB may be

disconnected from the cable and set aside while wiring.

5. The detector leads are factory wired. Verify that the detector leads are wired to the detector

terminal strip as shown in the applicable figure below:

• IR CH

4

Detector

Red wire to terminal labeled LEL R, white wire to terminal labeled LEL W, green wire to

terminal labeled LEL G, black wire to terminal labeled LEL B.

Figure 11: IR CH

4

Detector Wiring

•H

2

S Detector

Red wire to terminal labeled TOXIC +, black wire to terminal labeled TOXIC -.

Figure 12: H

2

S Detector Wiring

Green

Black

Red

White

- S + A B C

RS 485 PWR/SIG

R W G B

LEL

C NC NO

ALARM 1

C NC NO

ALARM 2

C NC NO

FAIL

Black

Red

C NC NO

ALARM 1

C NC NO

ALARM 2

C NC NO

FAIL

- S +

PWR/SIG

TOXIC OXY

+ - + -

RS 485

A B C

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RKI Instruments 30-0954RK-209D Owner's manual

RKI Instruments 30-0954RK-209D Owner's manual

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