RKI Instruments 65-2427RK-05 User manual

RKI Instruments, Inc.
www.rkiinstruments.com
65-2427RK-05
Hydrogen Sulfide Detector
Operator’s Manual
Part Number: 71-0227RK
Revision: C
Released: 6/15/20

2 • 65-2427RK-05 H2S Detector
WARNING
Read and understand this instruction manual before operating instru-
ment. 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.

65-2427RK-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 • 65-2427RK-05 H2S Detector
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
H2S Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Mounting the H2S Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Wiring the H2S Detector to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Replacing Components of the H2S Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Span Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

65-2427RK-05 H2S Detector • 5
Overview
This manual describes the 65-2427RK-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 65-2427RK-05, you must follow the instructions and warnings
in this manual to assure proper and safe operation of the 65-2427RK-05 and to
minimize the risk of personal injury. Be sure to maintain and periodically
calibrate the 65-2427RK-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
Detection Range 0 to 100 PPM (parts per million)
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
Accuracy ± 5% of reading or ± 2 ppm H2S (whichever is greater)
Operating Temperature -40°F to 104°F (-40°C to 40°C)
!

6 • 65-2427RK-05 H2S Detector
Description
This section describes the components of the 65-2427RK-05 H2S detector. The 65-2427RK-
05 consists of the 65-2428 H2S detector and junction box.
Figure 1: H2S Detector Component Location
Rubber
Spacer,
3X
Terminal Block
H2S Detector
Red
Black
J-Box

65-2427RK-05 H2S Detector • 7
65-2428 H2S Detector
The 65-2428 H2S detector consists of the detector housing body, detector housing cap, cap
gasket, rubber boot, spacer, and the plug-in sensor.
Figure 2: H2S Detector Component Location
Detector Housing Body, Housing Cap, & Cap Gasket
The detector housing body protects the sensing components within the housing. Use the 3/4”
NPT mounting threads at the top of the housing to screw the H2S detector into the bottom
conduit hubs of the junction box. 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 body. Use these wires to connect the
H2S detector to the junction box terminal strip. 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

8 • 65-2427RK-05 H2S Detector
Plug-In 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 corresponds to the
detection range of the detector.
Junction Box
The junction box allows you to install the detector at a mounting site that is remote from a
controller, and it protects the detector wiring connections. Two conduit hubs allow you to
mount the detector to the junction box and connect the wiring from the detector to a controller.
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. The terminal block within the junction box facilitates the
wiring process. A cover on the front of the junction box allows access to the interior of the
junction box.
Installation
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. 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.

65-2427RK-05 H2S Detector • 9
Figure 3: Outline & Mounting Dimensions
2. At the monitoring site you select, hang or mount the junction box with the detector facing
down (see Figure 3).
Rubber
Spacers
3X
3.10
.75 .38
3.65
3/4 NPT
Female
H2S Detector
J-Box
1-1/2 - 20 Thread
for Calibration Cup
8.45 MAX

10 • 65-2427RK-05 H2S Detector
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. Remove the junction box cover.
WARNING: To maintain the explosion proof classification of the H2S detector, a conduit
seal must be used within 2 inches of the junction box conduit hub used for
wiring to the controller.
4. Guide a two-conductor, shielded cable or two wires in conduit through an unused conduit
hub of the junction box. Use appropriate conduit fittings and construction technique for
the environmental and hazardous location rating of the junction box. The junction box is
rated NEMA 4X and Class 1, Division 1, Groups B, C, D.
5. Connect the two wires to the detector using the 2 point 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.
6. Secure the junction box cover to the junction box.
7. Route the cable or wires leading from the H2S detector 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.
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.