RKI Instruments 65-2434RK Manuale utente

65-2434RK

Carbon Monoxide Transmitter

Operator’s Manual

Part Number: 71-0061RK

Revision: D

Released: 2/16/11

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65-2434RK CO Transmitter

WARNING

Read and understand this instruction manual before operating

detector. 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.

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65-2434RK CO Transmitter

Product Warranty

RKI Instruments, Inc. warranties 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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65-2434RK CO Transmitter

Table of Contents

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

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

CO Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Charcoal Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Amplifier PCB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Mounting the CO Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Wiring the CO Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Replacing Components of the CO Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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65-2434RK CO Transmitter • 1

Overview

This manual describes the 65-2434RK carbon monoxide (CO) transmitter. This manual

also describes how to install, start up, maintain, and calibrate the transmitter. A parts list

at the end of this manual lists replacement parts and accessories for the CO transmitter.

Specifications

Table 1 lists specifications for the CO transmitter.

WARNING: When using the 65-2434RK, you must follow the instructions and warnings

in this manual to assure proper and safe operation of the 65-2434RK and to

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

calibrate the 65-2434RK as described in this manual.

Table 1: Specifications

Target Gas Carbon monoxide (CO)

Sampling Method Diffusion

Input Voltage 10 VDC - 30 VDC

Signal Output 4 - 20 mA

Detection Range 0 to 300 PPM (parts per million)

Accuracy ± 5% of reading or ± 5 ppm CO (whichever is greater)

Response Time 90% in 30 seconds

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2 • 65-2434RK CO Transmitter

Description

This section describes the components of the CO transmitter. The transmitter consists of

the CO sensor, charcoal filter, amplifier printed circuit board (PCB), and enclosure.

Figure 1: CO Transmitter Component Location

CO Sensor

The sensor is cylindrical with the sensing face on the top and the connection pins on the

bottom. The sensor plugs into the amplifier PCB with the four pins. The sensor is exposed

to the ambient air through an opening in the enclosure cover. Through a series of chemical

and electrical reactions, the sensor produces an electrical output that is proportional to the

detection range of the transmitter.

Charcoal Filter

The disc-shaped charcoal filter is secured to the sensing face of the sensor by a rubber

boot. The filter prevents interference gases (hydrogen sulfide [H2S] and certain

hydrocarbons) from producing false CO readings.

Amplifier PCB

The amplifier PCB converts the electrical output from the sensor to a 4 to 20 mA signal

(that is proportional to the detection range) and transmits the signal to a gas monitoring

controller. The amplifier PCB includes the interconnect terminal strip, sensor sockets, span

pot, zero pot, and test points (see Figure 1).

Amplifier PCB

Zero Pot

Span Pot

Test Point CAL-

Factory Set Pot

Amplifier PCB Mounting

Screw (under sensor)

Cable Bushing

Amplifier PCB

Mounting Screw

Sensor (w/charcoal

filter & boot)

CAL-

TB1 CAL+

SPAN

Enclosure

(shown w/out cover)

Interconnect

Terminal Strip

Test Point

CAL+

ZERO

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65-2434RK CO Transmitter • 3

Interconnect Terminal Strip

The interconnect terminal strip is the four-point terminal strip on the lower left side of the

amplifier PCB. Use the interconnect terminal strip to connect the transmitter to a

controller.

Sensor Sockets

There are four sensor sockets located in a circular pattern near the top of the amplifier

PCB. The sensor plugs into these sockets.

Span Pot

The span pot is near the bottom right corner of the amplifier PCB. Use the span pot to

adjust the transmitter’s response output during the calibration procedure.

Zero Pot

The zero pot is above the span pot. Use the zero pot to adjust the transmitter’s target gas-

free output during the start-up and calibration procedures.

CAUTION: There is a third potentiometer on the PCB, the null potentiometer. It is factory-set.

Do not adjust it.

Test Points

The test points (labeled CAL+ and CAL-) are on the right of the interconnect terminal

strip. The test points produce a 100 - 500 mV output that is proportional to the

transmitter’s 4 - 20 mA output. Use the test points and a voltmeter to measure the

transmitter’s output during the start-up and calibration procedures.

Enclosure

The enclosure enables you to install the CO transmitter at a mounting site that is remote

from the controller. The enclosure also protects the amplifier PCB and wiring connections

made to the transmitter. Use the cable bushing on the bottom of the enclosure to connect

wiring from the amplifier PCB to a controller.

Use the enclosure’s two mounting holes, accessible with the cover removed, to mount the

CO transmitter to a vertical surface at the monitoring site. Use the cover on the front of the

enclosure to access the interior of the enclosure.

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4 • 65-2434RK CO Transmitter

Installation

This section describes procedures to mount the CO transmitter in the monitoring

environment and wire the transmitter to a gas monitoring controller.

Mounting the CO Transmitter

1. Select a mounting site that is representative of the monitoring environment. Consider

the following when you select the mounting site.

• Select a site where the transmitter is not likely to be bumped or disturbed. Make

sure there is sufficient room to perform start-up, maintenance, and calibration

procedures.

• Select a site where the target gas is likely to be found first.

NOTE: If your application does not require a specific mounting site, mount the

transmitter at approximately breathing level.

Figure 2: Mounting the CO Transmitter

2. Remove the enclosure’s cover by unscrewing the four cover screws, one at each

corner.

3. At the monitoring site, use #6 screws through the enclosure’s two mounting holes to

secure it to a vertical surface.

4. Secure the cover to the enclosure with the four cover screws.

2.52

CO Sensor

.24

.54

1.50 1.42

3.39

3.86

Ø.160 mounting hole,

2X, Accessible With Lid

Removed

.80 max Cable Bushing

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65-2434RK CO Transmitter • 5

Wiring the CO Transmitter to a Controller

WARNING: Always verify that the power source is off before you make wiring

connections.

1. Turn off the controller.

2. Turn off or unplug incoming power at the power source end.

3. Remove the enclosure’s cover by unscrewing the four cover screws, one at each

corner.

4. Guide a two-conductor, shielded cable through the cable bushing at the bottom of the

enclosure.

5. Connect the two wires to the interconnect terminal strip as follows (see Figure 3.)

• Connect the positive wire to the terminal labeled +V.

• Connect the feedback wire to the terminal labeled FB.

CAUTION: Leave the shield drain wire insulated and disconnected at the transmitter. You will

connect the opposite end of the cable’s drain wire at the controller.

6. Secure the cover to the enclosure.

7. Route the cable leading from the CO transmitter through one of the conduit hubs at

the controller housing.

CAUTION: Do not route controller power and transmitter wiring through the same conduit hub.

The power cable may disrupt the transmission of the transmitter signal to the

controller.

8. Connect the wires to the applicable controller transmitter terminal strip as shown in

Figure 3 below.

Figure 3: Wiring the CO Transmitter to a Controller

+ (10 VDC - 30 VDC)

4-20mAIn(FB)

Controller or Recording

Device

CAL-

TB1 CAL+

SPAN

ZERO

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6 • 65-2434RK CO Transmitter

9. Connect the cable’s drain to an available chassis ground at the controller. RKI

controllers typically have a ground stud that can be used to ground the cable’s drain

wire.

Start Up

This section describes procedures to start up the CO transmitter and place the transmitter

into normal operation.

Introducing Incoming Power

1. Complete the installation procedures described earlier in this manual.

2. Verify that the power wiring to the controller is correct and secure. Refer to the

controller instruction manual.

3. Turn on or plug in the incoming power at the power source end, then turn on the

controller.

4. Verify that the controller is on and operating properly. Refer to the controller

operator’s manual.

CAUTION: Allow the transmitter to warm up for 5 minutes before you continue with the next

section, “Setting the Zero Signal”.

Setting the Zero Signal

NOTE: If you can verify that the detector is in a fresh air environment (environment

known to be of normal oxygen content and free of toxic and combustible gases),

it is not necessary to apply zero air when verifying or setting the fresh air

reading.

The procedure below describes applying zero emission air, usually called zero air, using a

calibration kit that includes a calibration cup, calibration gas, sample tubing, and a fixed

flow regulator with an on/off knob. RKI Instruments, Inc. recommends using a 0.5 LPM

(liters per minute) fixed flow regulator.

1. Remove the enclosure’s cover by unscrewing the four cover screws, one at each

corner.

2. Set a voltmeter to measure in the millivolt (mV) range.

3. Plug the voltmeter leads into the test points on the amplifier PCB. Plug the positive

lead into the test point labeled CAL+; plug the negative lead into the test point labeled

CAL-.

4. Screw the regulator into the zero air calibration cylinder.

5. Use the sample tubing to connect the regulator to the calibration cup.

6. Turn the regulator’s on/off knob counterclockwise to open it.

7. Hold the calibration cup against the CO sensor’s face. Leave the rubber boot and

sealing spacer on the sensor when calibrating. Hold the cup on gently to allow gas to

escape and avoid pressurizing the sensor’s sensing face.

8. Allow the gas to flow for 2 minutes.

9. Verify a voltmeter reading of 100 mV (±2 mV).

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