RKI Instruments 65-2391RK Manuale utente

65-2391RK

CO2Transmitter

Operator’s Manual

Part Number: 71-0121RK

Revision: B

Released: 7/18/14

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65-2391RK CO2Transmitter

WARNING

Read and understand this instruction manual before

operating transmitter. Improper use of the transmitter could

result in bodily harm or death.

Periodic calibration and maintenance of the transmitter is

essential for proper operation and correct readings. Please

calibrate and maintain this transmitter regularly! Frequency

of calibration depends upon the type of use you have and

the sensor types. Typical calibration frequencies for most

applications are between 6 and 12 months, but can be

required more often or less often based on your usage.

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65-2391RK CO2Transmitter

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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65-2391RK CO2Transmitter

Table of Contents

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

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

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

IR CO2Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

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

Mounting the CO2Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Wiring the CO2Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

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

Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Replacing Components of the CO2Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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65-2391RK CO2Transmitter • 1

Overview

This manual describes the 65-2391RK CO2transmitter. This manual also describes how to

install, start up, configure, maintain, and calibrate the transmitter when it is used with a

gas monitoring controller. A parts list at the end of this manual lists replacement parts and

accessories for the CO2 transmitter.

Specifications

Table 1 lists specifications for the CO2transmitter.

WARNING: When using the 65-2391RK, you must follow the instructions and warnings

in this manual to assure proper and safe operation of the 65-2391RK and to

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

calibrate the 65-2391RK as described in this manual.

Table 1:Specifications

Target/Calibration Gas Carbon Dioxide (CO2)

Area Classification Explosionproof for Class I, Groups B, C, and D

Sampling Method Diffusion

Signal Output 4 to 20 mA

Detection Range 65-2391RK-02: 0 - 5,000 ppm

65-2391RK-03: 0 - 5% Volume

65-2391RK-05: 0 - 50% Volume

65-2391RK-10: 0 - 100% Volume

Response Time 90% in 45 seconds

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

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2 • 65-2391RK CO2Transmitter

Description

This section describes the components of the CO2transmitter. The transmitter is a 4 - 20

mA type detector head. It consists of the infrared CO2detector, amplifier, and junction

box.

Figure 1: CO2Transmitter Component Location

Infrared CO2Detector

The infrared CO2 detector is made up of a miniature infrared CO2detector housed and

encapsulated in a pipe nipple. The pipe nipple has 3/4 inch NPT threads on each end and

a 1 1/4 inch 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.

To distinguish the different ranges of CO2detectors from one another, a short length of

shrink tubing is applied to the wiring where it comes out of the nipple. The following

table indicates the color of the shrink tubing and the color of the wire to which it is

applied.

GND

24V

4-20

RED

WHT

GRN

BLK

SENSOR POWER/SIG

TP+

TP-

Amplifier

Interconnec

terminal str

Test point (-)

ecuring screw (2)

Test point (+)

Zero potentiometer

Span potentiometer

Potentiometer

(factory set)

Potentiometer

(factory set)

Jumper pins

(factory use only)

IR CO Detector

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65-2391RK CO2Transmitter • 3

Amplifier

The amplifier converts the electrical output from the detector to a 4 to 20 mA signal that

corresponds to the detection range and transmits the signal to a gas monitoring controller.

The amplifier includes the interconnect terminal strip, span potentiometer, zero

potentiometer, and test points (see Figure 1).

Interconnect Terminal Strip

The interconnect terminal strip is a seven-point terminal strip. Use the interconnect

terminal strip to connect the IR CO2detector to the amplifier and the amplifier to a

controller.

NOTE: The IR CO2 detector is factory-wired to the amplifier. See the Installation section

of this manual for all wiring procedures related to the transmitter.

Span Potentiometer

The span potentiometer is near the bottom of the amplifier (see Figure 1). Use the span

potentiometer to adjust the transmitter’s response output during the calibration

procedure. Turn the adjustment screw clockwise to increase the gas response and

counterclockwise to decrease the gas response.

Zero Potentiometer

The zero potentiometer is to the right of the span potentiometer (see Figure 1). Use the

zero potentiometer to adjust the transmitter’s target gas-free output during the start-up

and calibration procedures. Turn the adjustment screw clockwise to increase the zero

output and counterclockwise to decrease the zero output.

CAUTION: The amplifier includes two additional potentiometers. They are factory-set. Do not

adjust them.

Test Points

The test points (labeled TP+ and TP-) are to the left of the interconnect terminal strip

(see Figure 1). The test points produce a 100 to 500 mV output that corresponds to the

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

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

Table 2: CO2Detector Color Designations

Detector Color Designations

0 - 5,000 ppm black shrink tubing on white wire

0 - 5% volume green shrink tubing on white wire

0 - 50% volume green shrink tubing on red wire

0 - 100% volume red shrink tubing on green wire

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4 • 65-2391RK CO2Transmitter

Junction Box

Use the junction box to install the CO2transmitter at a mounting site that is remote from

the controller. The junction box also protects the amplifier and wiring connections made

to the amplifier. Use the two 3/4 in. conduit hubs to mount the detector to the junction

box (bottom hub) and connect wiring from the amplifier to the controller (top hub).

NOTE: The detector and amplifier are factory-mounted to the junction box.

Use the junction box’s two mounting holes to mount the CO2transmitter to a vertical

surface at the monitoring site. Use the cover on the front of the junction box to access the

interior of the junction box.

Installation

This section describes procedures to mount the CO2transmitter in the monitoring

environment and wire the transmitter to a controller.

Mounting the CO2 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.

• Select a site where there is sufficient room to perform start-up, maintenance, and

calibration procedures.

• Mount the transmitter at least six feet from the floor to minimize the possibility of

someone breathing on the unit. The exhaled CO2may cause an alarm.

Figure 2: Mounting the CO2Transmitter

3.94

6.10

.10

.25 Dia. Mountin

Hole, 2X

3/4 NPT Condu

7.3 Max

2.75

5.20

3/4 NPT For

Calibration Cup

1.9

Max

5.46

NOTE: All Dimensions in Inches

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65-2391RK CO2Transmitter • 5

If the detector is mounted to the junction box, skip to step 5. If not, continue with step 2.

2. Remove the junction box cover.

3. Guide the four wires that extend from the top of the detector through the bottom

conduit hub of the junction box.

4. Screw the detector into the bottom conduit hub of the junction box.

5. At the monitoring site, use #10 screws through the junction box’s two mounting holes

to secure the junction box to a vertical surface.

CAUTION: Mount the CO2transmitter with the detector facing down (see Figure 2.)

Wiring the CO2Transmitter to a Controller

WARNING: Always verify that the power to the controller is off before you make

wiring connections.

1. Turn off power to the controller.

2. Place the controller’s power switch in the OFF position.

3. Remove the junction box cover.

4. Verify that the detector leads are wired to the amplifier’s interconnect terminal strip.

If necessary, connect the detector leads to the interconnect terminal strip as shown in

Figure 3.

5. Guide a three-conductor, shielded cable or three wires in conduit through the top

conduit hub of the junction box.

6. Connect the three wires to the interconnect terminal strip as follows (see Figure 3).

• Connect the positive wire to the 24VDC terminal.

• Connect the feedback wire to the 4-20 (FB) terminal.

• Connect the negative wire to the GND (DC -) terminal.

CAUTION: If shielded cable is used, leave the cable shield’s drain wire insulated and

disconnected at the transmitter. You will connect the opposite end of the cable’s drain

wire at the controller to chassis ground.

7. Secure the junction box cover to the junction box.

8. Route the cable or wires leading from the CO2 transmitter through one of the conduit

hubs at the controller housing.

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

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

controller.

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6 • 65-2391RK CO2Transmitter

9. Connect the wires to the applicable transmitter terminal strip at the controller as

shown in Figure 3 below.

Figure 3: Wiring the CO2Transmitter to a Controller

10. If shielded cable is used, connect the cable’s drain wire to an available chassis ground

at the controller.

Start Up

This section describes procedures to start up the CO2transmitter 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 operator’s manual.

3. Turn on or plug in power to the controller, then place the controller’s power switch in

the ON position.

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

operator’s manual.

GND

24V

4-20

RED

WHT

GRN

BLK

SENSOR POWER/SIG

TP+

TP-

Black

Green

White

Red

Controller Transmitte

Terminals,Typical

- (DC -)

+ 24 VDC

4 - 20 mA In (FB or S

)

Cable Shield

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