RKI Instruments 65-2422RK-05 User manual

www.rkiinstruments.com
65-2422RK-05
Hydrogen Sulfide Transmitter
Operator’s Manual
Part Number: 71-0114RK
Revision: D
Released: 6/12/20

2 • 65-2422RK-05 H2S 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.

65-2422RK-05 H2S 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 APARTICULAR 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 • 65-2422RK-05 H2S Transmitter
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
H2S Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mounting the H2S Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Wiring the H2S Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Preventive Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Replacing Components of the H2S Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Setting the Response Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

65-2422RK-05 H2S Transmitter • 5
Overview
This manual describes the hydrogen sulfide (H2S) 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 H2S transmitter.
Specifications
WARNING: Do not use this product in a manner not specified in this instruction manual.
Table 1 lists specifications for the H2S transmitter.
NOTE: The following symbol on the detector label is a caution to the user to refer to this
documentation for installation and operation instructions:
WARNING: When using the 65-2422RK-05, you must follow the instructions and warnings
in this manual to assure proper and safe operation of the 65-2422RK-05 and to
minimize the risk of personal injury. Be sure to maintain and periodically
calibrate the 65-2422RK-05 as described in this manual.
Table 1: Specifications
Target Gas Hydrogen sulfide (H2S)
Area Classification Explosionproof for Class I, Groups B, C, and D
Temperature Code T6
Installation Category Installation Category 1. Signal level, special equipment or parts
of equipment, telecommunication, electronic, etc., with smaller
transient overvoltages than Installation Category (Overvoltage
Category) II (ref. IEC 664).
Input Voltage 11 VDC - 30 VDC
Sampling Method Diffusion
Signal Output 4 to 20 mA
Detection Range 0 to 100 PPM (parts per million)
Accuracy ± 5% of reading or ± 2 ppm H2S (whichever is greater)
H2S Detector Signal Output 0.3 mA at 0 ppm H2S nominal
2.5 mA at 100 ppm H2S nominal
Response Time 90% in 30 seconds
Operating Temperature -40°F to 104°F (-40°C to 40°C)
!

6 • 65-2422RK-05 H2S Transmitter
Description
This section describes the components of the H2S transmitter. The transmitter consists of the
H2S detector, amplifier, and junction box.
Figure 1: H2S Transmitter Component Location
Test Point (+)
FB
TP+
4/20
OXY
+
24V
GW
Interconnect
Terminal Strip
Securing
Screw (2)
3/4 NPT Conduit Hub
SPAN
RD
ZERO
TP
OXY
TOXIC
Span
Potentiometer
Factory Set
Potentiometer
Zero
Potentiometer
Test Point (-)
BATT
TOXIC
+
BK
Jumper Block
InstalledToToxic
Select Header
Hydrogen
Sulfide
Amplifier
Detector
Terminal Strip
Hydrogen Sulfide
Detector

65-2422RK-05 H2S Transmitter • 7
H2S Detector
The H2S detector includes the detector housing body, detector housing cap, cap gasket, rubber
boot, spacer, and the plug-in H2S sensor.
Figure 2: H2S 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 H2S 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 H2S detector to the amplifier. One of the wires is red and one of
the wires is black.
The housing includes a four-socket pattern. This socket pattern accepts the sensor’s four pins
to secure the sensor within the detector housing. A pre-amplifier, located between the sockets
and two interconnect wires, conditions the sensor’s signal before the signal reaches the
controller.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. It retains the plug-in sensor and protects it
from damage. The housing cap also includes a flame arrestor which contains any sparks that
may occur within the detector and a flame arrestor guard which protects the flame arrestor
from damage. 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.
Rubber Boot and Spacer
A rubber boot and spacer are installed between the detector housing cap and the sensor. They
help ensure that the detector remains plugged into the detector housing body.
Spacer
Rubber Boot
H2S Plug-inSensor
Flame
Arrestor
Guard
Detector
Housing Cap
Detector Housing Body
Cap Gasket

8 • 65-2422RK-05 H2S Transmitter
Plug-In H2S Sensor
The sensor is secured within the sensor housing by the four pins. Through a series of chemical
and electrical reactions, the sensor produces an electrical output that is proportional to the
detector range of the transmitter.
Amplifier
The amplifier 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 includes the amplifier type selector, detector terminal strip, interconnect
terminal strip, span pot, zero pot, and test points (see Figure 1).
Amplifier Type Selector
The amplifier type selector is near the bottom left corner of the amplifier. It is to the left of the
detector terminal strip and below the span potentiometer.
The amplifier included with the H2S transmitter is designed for use with RKI’s toxic gas and
oxygen transmitters. The amplifier type selector determines for which transmitter the
amplifier is intended. For H2S transmitters, a jumper block is installed over the TOXIC
selector (see Figure 1).
Detector Terminal Strip
The detector terminal strip is the four-point terminal strip near the bottom of the amplifier.
Use the detector terminal strip to connect the H2S detector to the amplifier.
NOTE: The H2S detector is factory-wired to the amplifier. See the Installation section of this
manual for all wiring procedures related to the transmitter.
Interconnect Terminal Strip
The interconnect terminal strip is the four-point terminal strip near the top of the amplifier.
Use the interconnect terminal strip to connect the amplifier to a controller.
Span Pot
The span pot is on the left side of the amplifier. Of the three potentiometers, the span pot is
bottom most. 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:The third potentiometer is factory-set. Do not adjust it.

65-2422RK-05 H2S Transmitter • 9
Test Points
The test points (labeled TP- and TP+) are on the left and right side of the interconnect
terminal strip. The test points produce a 100 to 500 mV output that is proportional 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.
Junction Box
Use the junction box to install the H2S transmitter 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 NPT 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 H2S detector and amplifier are factory-mounted to the junction box.
Use the junction box’s two mounting holes to mount the H2S transmitter 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 H2S transmitter in the monitoring environment
and wire the transmitter to a controller.
Mounting the H2S 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.

10 • 65-2422RK-05 H2S Transmitter
Figure 3: Mounting the H2S Transmitter
If the H2S detector is mounted to the junction box, skip to step 5. If not, continue with step 2.
NOTE: The H2S detector is normally provided with a Killark HKB junction box and an HFC
lid rated explosion proof for Class I, Groups B, C, and D. This combination is shown
in Figure 2 above. Any junction box with an internal volume less than or equal to 69
cubic inches and rated explosion proof for ClassI, Groups B, C, and D may be used.
2. Remove the junction box cover.
3. Guide the two wires that extend from the top of the H2S detector through the bottom
conduit hub of the junction box.
4. Screw the H2S 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 H2S transmitter with the detector facing down (see Figure 2).
Ø .25 Mouting Holes (2X)
5.46
8.7 max
5.2
2.75
6.1
1.1
3.4 max
3/4 NPT Conduit Hub
3.94