RKI Instruments 65-2423RK-05 User manual

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65-2423RK-05
Hydrogen Sulfide Detector
Operator’s Manual
Part Number: 71-0126RK
Revision: B
Released: 7/6/20

2 • 65-2423RK-05 H2S Detector
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.

65-2423RK-05 H2S Detector • 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 • 65-2423RK-05 H2S Detector
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Detector Housing, Housing Cap, & Cap Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rubber Boot and Spacer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mounting the H2S Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Wiring the H2S Detector to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Preventive Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Replacing Components of the H2S Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Setting the Response Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

65-2423RK-05 H2S Detector • 5
Overview
This manual describes the 65-2423RK-05 hydrogen sulfide (H2S) detector. This manual also
describes how to install, start up, maintain, and calibrate the detector 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 H2S detector.
Specifications
WARNING: Do not use this product in a manner not specified in this instruction manual.
Table 1 lists specifications for the H2S detector.
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 65-2423RK-05, you must follow the instructions and warnings
in this manual to assure proper and safe operation of the 65-2423RK-05 and to
minimize the risk of personal injury. Be sure to maintain and periodically
calibrate the 65-2423RK-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).
Sampling Method Diffusion
H2S Detector Signal Output 0.3 mA at 0 ppm H2S nominal
2.5 mA at 100 ppm H2S nominal
Detection Range 0 to 100 PPM (parts per million)
Accuracy ± 5% of reading or ± 2 ppm H2S (whichever is greater)
Response Time 90% in 30 seconds
Operating Temperature -40°F to 104°F (-40°C to 40°C)
* The area classification only applies if the detector is installed using a junction box with an
internalvolume less than or equal to 69 cubic inches and rated explosion proof for Class I,
Groups B, C, and D. The detector is not explosion proof if it is installed in a non-explosion proof
enclosure, such as in a conduit hub of a controller like the Beacon 200 or Beacon 800.
!

6 • 65-2423RK-05 H2S Detector
Description
This section describes the components of the H2S detector. The detector consists of the
detector housing body, housing cap, cap gasket, rubber boot, spacer, and the H2S sensor.
Figure 1: H2S Detector Component Location
Detector Housing Body, Housing Cap, & Cap Gasket
The detector housing body protects the sensing components within the housing. Use the
mounting threads at the top of the housing to screw the H2S detector into a 3/4 NPT hub. Use
the removable cap near the bottom of the housing to access the sensor for maintenance or
replacement. The cap protects the sensor from damage and includes a flame arrestor which
contains any sparks which may occur within the detector housing. A cap gasket seals the
interface between the housing and cap. A flame arrestor guard is permanently bonded to the
cap.
Two wires extend from the top of the detector housing. Use these wires to connect the H2S
detector to a controller. 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.
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

65-2423RK-05 H2S Detector • 7
Sensor
The sensor is secured within the sensor housing by four pins. Through a series of chemical
and electrical reactions, the sensor produces an electrical output that is proportional to the
detection range of the detector.
Installation
NOTE: Normally, the H2S detector is shipped already installed in one of the bottom conduit
hubs of a controller and factory wired to the controller. If your detector is already
installed in a controller, use this section for reference only.
This section describes procedures to mount the H2S detector in the monitoring environment
and wire the detector to a controller.
Mounting the H2S Detector
1. Whether you will mount the detector directly to a controller or to a junction box, 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 detector 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 detector at
approximately breathing level.

8 • 65-2423RK-05 H2S Detector
Figure 2: Outline & Mounting Dimensions
2. At the monitoring site, mount the detector in one of the following two ways:
• Screw the detector’s 3/4 NPT mounting thread into an empty conduit hub on a
controller.
OR
• Screw the detector’s 3/4 NPT mounting thread into an appropriately rated junction
box.
CAUTION: Mount the H2S detector with the detector facing down (see Figure 2).
NOTE: If the mounting site requires the detector installation to be explosion proof, you must
install the detector in a junction box with an internal volume less than or equal to 69
cubic inches and rated explosion proof for Class I, Groups B, C, and D.
Shrink Tubing
3/4 NPT
1.62 Flats for
Wrench
1-1/2-20 For Calibration Cup
9.75 Ref
2.25 Ref
Ø1.75
0.75
3.59

65-2423RK-05 H2S Detector • 9
Wiring the H2S Detector 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 power to the controller.
3. If the detector is mounted remotely from a controller using an explosion proof junction
box, proceed to step 4.
If the detector is mounted directly to a controller, connect the detector’s red and black
wires to the appropriate controller detector terminals and skip to the Startup Section.
4. Remove the junction box cover.
WARNING: To maintain the explosion proof classification of the H2S detector/junction box
combination, a conduit seal must be used within 2 inches of the junction box
conduit hub used for wiring to the controller. Adhere to your local electrical
code when installing the conduit seal.
5. Guide a two-conductor, shielded cable or two wires in conduit through an unused conduit
hub of the junction box.
6. Connect the two wires to the detector using an appropriate terminal block.
CAUTION: If using shielded cable, leave the drain wire insulated and disconnected at the
detector. You will connect the opposite end of the cable’s drain wire at the
controller.
7. Secure the junction box cover to the junction box.
8. Route the cable or wires leading from the H2S detector through one of the conduit hubs at
the controller housing.
CAUTION: Do not route power and detector wiring through the same conduit hub. The
power cable may disrupt the transmission of the detector signal to the controller.
9. Connect the wires to the applicable controller terminal strip. See the controller operator’s
manual and the controller’s detector head specification sheet for the H2S detector.
WARNING: If the controller’s construction is not explosion-proof, the controller must be
installed in an ordinary location. Do non install a non-explosion-proof
controller in a classified location.

10 • 65-2423RK-05 H2S Detector
.
Figure 3: Wiring the H2S Detector to a Controller
10. If shielded cable is used, connect the cable’s drain wire to an available chassis (earth)
ground at the controller. RKI controllers typically have a ground stud that can be used to
ground the cable’s drain wire.
11. Reinstall the junction box cover.
S
+
Controller H2S DetectorTerminals
(typical terminal designation shown)
RedBlack