RKI Instruments 65-2340RK User manual

RKI Instruments, Inc.
www.rkiinstruments.com
65-2340RK
Toxic Gas Transmitter
Operator’s Manual
Part Number: 71-0143RK
Revision: G
Released: 6/12/20

2 • 65-2340RK Toxic Gas Transmitter
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 frequen-
cies for most applications are between 3 and 6 months, but can be
required more often or less often based on your usage.

65-2340RK Toxic Gas 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 • 65-2340RK Toxic Gas Transmitter
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Toxic Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mounting the Toxic Gas Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Wiring the Toxic Gas Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Setting the Zero Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Replacing Components of the Toxic Gas Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Setting the Zero Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

65-2340RK Toxic Gas Transmitter • 5
Overview
This manual describes the 65-2340RK toxic gas transmitter. This manual also describes how
to install, start up, maintain, and calibrate the toxic gas transmitter when used with a gas
monitoring controller. A parts list at the end of this manual lists replacement parts and
accessories for the toxic gas transmitter.
The 65-2340RK toxic gas transmitter can be used for various target gases which are listed in
Table 1 below. For a particular target gas, the part number of the toxic transmitter will be of
the format 65-2340RK-XXX. For example, 65-2340RK-NH3 is for ammonia (NH3)
detection.
Specifications
Table 1 lists specifications for the toxic gas transmitter.
WARNING: When using the 65-2340RK, you must follow the instructions and warnings in
this manual to assure proper and safe operation of the 65-2340RK and to
minimize the risk of personal injury. Be sure to maintain and periodically
calibrate the 65-2340RK as described in this manual.
Table 1: Specifications
Target Gas 65-2340RK-ASH3: Arsine (AsH3)
65-2340RK-CL2: Chlorine (Cl2)
65-2340RK-CL-10: Chlorine (Cl2)
65-2340RK-HCN: Hydrogen Cyanide (HCN)
65-2340RK-NH3: Ammonia (NH3)
65-2340RK-SO2: Sulphur Dioxide (SO2)
65-2340RK-PH3: Phosphine (PH3)
Sampling Method Diffusion
Detection Range AsH3: 0 - 1.50 ppm
Cl2: 0 - 3.00 ppm
Cl2: 0 - 10.0 ppm
HCN: 0 - 15.0 ppm
NH3: 0 - 75.0 ppm
SO2: 0 - 6.00 ppm
PH3: 0 - 1.00 ppm
Accuracy ± 10% of reading or ± 5% of full scale (whichever is greater)
Signal Output 4 to 20 mA
Response Time •Cl
2and NH3: T90 in 90 seconds
• All others: T90 in 45 seconds
Operating Temperature &
Humidity • 14°F to 104°F (-10°C to 40°C)
• 20% to 90% Relative Humidity

6 • 65-2340RK Toxic Gas Transmitter
Description
This section describes the components of the toxic gas transmitter. The toxic gas transmitter is
a 4 - 20 mA type detector head. It consists of the toxic detector, amplifier, and junction box.
Figure 1: Toxic Transmitter Component Location
SPAN
SIG/PWR
ZERO
TOXIC OXY S
Amplifier
J-Box
Toxic Detector

65-2340RK Toxic Gas Transmitter • 7
Toxic Detector
The toxic detector consists of the detector housing body, detector housing cap, splashguard,
cap gasket, and the plug-in sensor.
Figure 2: Toxic 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 toxic detector into the 3/4 NPT hub on
the bottom of the junction box. Two wires extend from the top of the detector housing body.
Use these wires to connect the toxic detector to the amplifier. One of the wires is black and
one of the wires is color coded depending on the detector type. See Figure 5 on page 12 for the
color code assignments.
The housing body includes a 12 position connector at the bottom of the housing body. The
plug-in sensor mates to this connector. A pre-amplifier located between the connector and the
two interconnect wires conditions the sensor’s signal before the signal reaches the controller.
Each plug-in sensor type (Cl2 for example) requires a different pre-amplifier, so there is a
different detector housing body for each gas type.
Housing Cap, Cap Gasket, & Splashguard
The housing cap screws onto the detector housing. It retains the plug-in sensor and protects it
from damage. A removable splashguard is screwed onto the detector cap to protect the sensor
from impact damage, direct water spray, and splashing. Unscrew the detector cap to access the
sensor for maintenance or replacement. A cap gasket seals the interface between the housing
and cap.
Plug-In Sensor
The plug-in sensor is secured in the detector assembly by the housing cap. There is a different
sensor for each target gas. Through a series of chemical and electrical reactions, the sensor
Splash Guard
(removable)
Sensor
(different for each detector type)
Detector Housing
Cap
Cap Gasket
Detector Housing Body
(different for each detector type)

8 • 65-2340RK Toxic Gas Transmitter
produces an electrical output that corresponds to the detection range of the sensor.
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 detector terminal strip, controller terminal strip, zero
pot, span pot, and test points (see Figure 3).
Figure 3: Amplifier Component Location
Controller Terminal Strip
The controller terminal strip is a two position plug-in style terminal strip located at the top
edge of the amplifier. Use the controller terminal strip to wire the 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. Two of the positions are for use with an oxygen sensor and are not
used in the toxic gas transmitter. Use the two detector terminal strip positions that are labelled
“TOXIC” to connect the detector to the amplifier.
NOTE: The detector is factory-wired to the detector terminal strip. See “Wiring the Toxic Gas
Transmitter to a Controller” on page 11 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 3). Use a small flat
blade screwdriver to turn the zero pot’s adjustment screw and adjust the amplifier’s zero (fresh
air) 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.
Controller Terminal Strip
Detector Terminal Strip
Mounting Screw
SIG/PWR
SPAN
Span Pot
Factory Adjust Pot
Zero Pot
ZERO
Red + Test Point
Black - Test Point
S
TOXIC OXY

65-2340RK Toxic Gas Transmitter • 9
Span Pot
The span pot is located to the right of the zero pot (see Figure 3). 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
span output and counterclockwise to decrease the span output.
CAUTION:The amplifier includes an additional potentiometer. It is factory-set. Do not adjust
it.
Test Points
The test points are on the left side of the amplifier (see Figure 3). 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 on the
detector during calibration.
Installation
This section describes procedures to mount the toxic gas transmitter in the monitoring
environment and wire the transmitter to a controller.
Mounting the Toxic Gas 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.

10 • 65-2340RK Toxic Gas Transmitter
Figure 4: Mounting the Toxic Gas Transmitter
2. At the monitoring site you select, hang or mount the junction box with the detector facing
down (see Figure 4).
3.65 Rubber
Spacer, 3X
3/4 NPT
Conduit Hub 0.38
.75
2.70
Junction
Box
9.60 Max
Toxic
Detector