RKI Instruments 65-2397RK Manuale utente

RKI Instruments, Inc.

www.rkiinstruments.com

65-2397RK

CO2 Transmitter

Operator’s Manual

Part Number: 71-0185RK

Revision: C

Released: 9/1/20

2 • 65-2397RK CO2 Transmitter

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.

65-2397RK CO2 Transmitter • 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 • 65-2397RK CO2 Transmitter

Table of Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

CO2 Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Mounting the CO2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Wiring the CO2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Replacing Components of the CO2 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Setting the Response Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

65-2397RK CO2 Transmitter • 5

Overview

This manual describes the 65-2397RK CO2 transmitter. 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 CO2 transmitter.

WARNING: When using the 65-2397RK, you must follow the instructions and warnings in this

manual to assure proper and safe operation of the 65-2397RK and to minimize the

risk of personal injury. Be sure to maintain and periodically calibrate the 65-2397RK

as described in this manual.

Table 1:Specifications

Targ et Gas Carbon Dioxide (CO2)

Sampling Method Diffusion

Signal Output 4 to 20 mA

Detection Range 65-2397RK-01: 0-9,000 ppm

65-2397RK-02: 0-5,000 ppm

65-2397RK-03: 0-5% Volume

65-2397RK-04: 0-20% Volume

65-2397RK-05: 0-50% Volume

65-2397RK-10: 0-100% Volume

Response Time 90% in 45 seconds

Operating Temperature -4°F to 122°F (-20°C to 50°C)

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

6 • 65-2397RK CO2 Transmitter

Description

This section describes the components of the CO2 transmitter. The transmitter is a 4 - 20 mA type

detector head. It consists of the CO2 detector, amplifier, and junction box.

Figure 1: CO2 Transmitter Component Location

LEL BWR

Amplifier

Controller Terminal Strip

PWR/SIG

J-Box

IR CO2 Detector

Detector Terminal

Strip

Sensor

Current

mA SPAN

Jumper Pins,

Factory Use Only

Factory Adjust Pot

Zero Pot

Span Pot

Factory Adjust Pot

ZERO

- Test Point

+ Test Point

65-2397RK CO2 Transmitter • 7

Infrared CO2 Detector

The CO2 detector consists of the detector housing body, detector housing cap, cap gasket, and the plug-

in sensor.

Figure 2: CO2 Detector Component Location

Detector Housing Body

The detector housing body protects the electronic components within the housing. Use the mounting

threads at the top of the housing to screw the CO2 detector into the 3/4 NPT hub on the bottom of the

junction box. 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.

The housing includes three sockets installed on a circuit board. These sockets accept the plug-in

sensor’s three pins to provide an electrical connection for the sensor. The circuit board with the sockets

conditions the sensor’s signal before the signal reaches the amplifier.

Housing Cap & Cap Gasket

The housing cap screws onto the detector housing. It retains the plug-in sensor and protects it from

damage. A foam gasket is installed inside the housing cap that seals against the sensor face. A

hydrophobic membrane on the outside of the cap face keeps water and particulates away from the

sensor face behind the cap. Unscrew the detector cap to access the plug-in sensor for maintenance or

replacement. A cap gasket seals the interface between the housing and cap.

Plug-In CO2Sensor

The plug-in sensor is secured in the detector assembly by the housing cap. The sensor produces a

millivolt output that corresponds to the detection range of the transmitter.

Hydrophobic

Membrane

Cap Gasket

Plug-In CO2 Sensor

Sensor Retainer

Detector Housing Cap

Detector Housing Body

8 • 65-2397RK CO2 Transmitter

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. A foam gasket that

orients the amplifier and keeps it from rotating is installed on the bottom of the amplifier. The

amplifier includes the controller terminal strip, detector terminal strip, span pot, zero pot, and test

points (see Figure 1).

Controller Terminal Strip

The controller terminal strip is a three position plug-in style terminal strip located near the top of the

amplifier. Use the controller terminal strip to wire the CO2 transmitter to a controller.

Detector Terminal Strip

The detector terminal strip is a four position plug-in style terminal strip located below the controller

terminal strip. Use the detector terminal strip to connect the CO2 transmitter to the amplifier.

NOTE: The IR CO2 detector is factory-wired to the detector terminal strip. See “Wiring the CO2

Transmitter to a Controller” on page 10 for all wiring procedures related to the transmitter.

Zero Pot

The zero pot is located in the upper left corner of the amplifier (see Figure 1). Use a small flat blade

screwdriver to turn the zero pot’s adjustment screw and adjust the amplifier’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.

Span Pot

The span pot is located to the right of the zero pot (see Figure 1). Use a small flat blade screwdriver to

turn the span pot’s adjustment screw and adjust the amplifier’s gas response output during the

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

counterclockwise to decrease the gas response.

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

them.

Test Points

The test points are on the left side of the amplifier (see Figure 1). The test points produce a 100 mV 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 amplifier’s output during the start-up and calibration procedures. The black

test point in the lower left corner is the negative (-) test point and the red test point below the zero pot

is the positive (+) test point.

Junction Box

Use the junction box to install the transmitter at a mounting site that is remote from the controller. The

junction box protects the amplifier and wiring connections made to the amplifier. Use the top 3/4 NPT

conduit hub to connect wiring from the amplifier to the controller. Use the cover on the front of the

junction box to access the interior of the junction box. The detector and amplifier are factory installed

in the junction box. Three spacers installed on the back of the junction box control the distance of the

junction box from a mounting surface and ensure that there is enough room to install a calibration cup

65-2397RK CO2 Transmitter • 9

on the detector during calibration.

Installation

This section describes procedures to mount the CO2 transmitter 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. Make sure 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 CO2 may cause an alarm.

Figure 3: Mounting the CO2 Transmitter

.38

.75

3.10

Rubber

Spacers,

3/4 NPT

Female

3.65

IR CO2

Detector

J-Box

1 1/2-20 Thread for

Calibration Cup

6.80 MAX

10 • 65-2397RK CO2 Transmitter

2. At the monitoring site you select, hang or mount the junction box with the detector facing down

(see Figure 3).

Wiring the CO2 Transmitter to a Controller

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

connections.

1. Turn off the controller.

2. Turn off or unplug power to the controller.

3. Remove the junction box cover.

4. The detector leads are factory wired. Verify that the detector leads are wired to the amplifier’s

detector terminal strip as shown in Figure 4.

5. To gain access to a plug-in terminal strip for wiring, pull it out of its socket by grasping the

terminal strip and pulling. The detector strip is keyed so that the controller and detector terminal

strips cannot be reversed inadvertently.

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

the junction box.

7. Pull out the controller terminal strip, and connect the three wires to the terminal strip as follows

(see Figure 4).

• Connect the positive wire to the PWR/SIG “+” terminal.

• Connect the signal wire to the PWR/SIG “S” terminal.

• Connect the negative wire to the PWR/SIG “-” terminal.

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

the transmitter. You will connect the opposite end of the cable’s drain wire to the

controller’s chassis (earth) ground.

8. Reinstall the controller terminal strip into its socket.

9. Secure the junction box cover to the junction box.

10. Route the cable or wires leading from the CO2 transmitter through one of the conduit hubs at the

controller housing. Use appropriate conduit fittings and construction technique for the

environmental rating of the controller. RKI controllers are typically rated NEMA 4X, are not

explosion-proof, and must be installed in a non-hazardous location.

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