RKI Instruments 65-2462RK User manual

RKI Instruments, Inc.
www.rkiinstruments.com
65-2462RK
Hydrogen Transmitter
Operator’s Manual
Part Number: 71-0554
Revision: P1
Released: 4/15/21

2 • 65-2462RK Hydrogen 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.

65-2462RK Hydrogen 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 • 65-2462RK Hydrogen Transmitter
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hydrogen Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Mounting the Hydrogen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Wiring the Hydrogen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Replacing Components of the Hydrogen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Zeroing with Nitrogen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Response Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Zeroing with Background Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

65-2462RK Hydrogen Transmitter • 5
Overview
This manual describes the 65-2462RK hydrogen 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 hydrogen
transmitter.
Specifications
Table 1 lists specifications for the hydrogen transmitter.
WARNING: When using the 65-2462RK, you must follow the instructions and warnings in this
manual to assure proper and safe operation of the 65-2462RK and to minimize the
risk of personal injury. Be sure to maintain and periodically calibrate the 65-2462RK
as described in this manual.
Table 1:Specifications
Target Gas Hydrogen
Area Classification Explosionproof for Class I, Groups B, C, and D
Sampling Method Diffusion
Signal Output 4 to 20 mA
Detection Range 0 to 10% volume
Accuracy ± 5% of reading or ± 2% of full scale (whichever is greater)
Response Time 90% in 45 seconds

6 • 65-2462RK Hydrogen Transmitter
Description
This section describes the components of the hydrogen transmitter. The transmitter is a 4 - 20 mA type
detector head. It consists of the hydrogen detector, amplifier, and junction box.
Figure 1: Hydrogen Transmitter Component Location
Hydrogen Detector
The H2sensor detects hydrogen in the %volume range. Two sensing elements are protected within the
detector. Through a series of thermal and electronic reactions, these elements produce an electrical
output that is proportional to the detection range. It is packaged in a 1/2 inch NPT nipple with a
sintered metal flame arrestor on one end allowing ambient air to diffuse into the detector. The flame
arrestor also contains any sparks which may occur within the detector. The 1/2 inch NPT mounting
threads at the top of the detector allow you to mount it into the bottom conduit hub of the junction box.
A rainshield screws onto the bottom of the detector (flame arrestor end). The rainshield helps protect
the detector from rain and debris in the monitoring environment. Four color-coded leads extend from
the top of the detector. The leads allow you to connect the detector to the amplifier.
RW GS
BPWR / SIG
H2 Detector
Amplifier
LEL
ZERO
SPAN
J-Box
Reducing Bushing,
3/4 NPT to 1/2 NPT

65-2462RK Hydrogen Transmitter • 7
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 sensor
voltage is factory set to 2.0V between the red and black wires. The amplifier includes the detector
terminal strip, controller terminal strip, span pot, zero pot, and test points.
Figure 2: Amplifier Component Location
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 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 detector to the amplifier.
NOTE: The detector is factory-wired to the detector terminal strip. See pg. 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 2). 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.
Span Pot
The span pot is located to the right of the zero pot (see Figure 2). 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.
LEL PWR / SIG
BS
GW
R
Mounting Screw
Detector Terminal Strip
Controller Terminal Strip
Zero Pot
Jumper Pins,
Factory Use Only
Red + Test Point
SPAN
ZERO
Black - Test Point
Factory Adjust Pots
Span Pot

8 • 65-2462RK Hydrogen Transmitter
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 2). 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
on 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 inch
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 hydrogen transmitter in the monitoring environment
and wire the transmitter to a controller.
Mounting the Hydrogen 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. For lighter gases, mount the detec-
tor near the ceiling; for heavier gases, mount the detector near the floor.

65-2462RK Hydrogen Transmitter • 9
Figure 3: Mounting the Hydrogen Transmitter
2. At the monitoring site you select, hang or mount the junction box with the detector facing down
(see Figure 3).
.382.70
.75
3/4 NPT Female
Rubber
Spacers,
3X
JBox
3.65
Hydrogen
Detector
3/4 x 1/2 Reducing
Bushing
7.7 max

10 • 65-2462RK Hydrogen Transmitter
Wiring the Hydrogen Transmitter to a Controller
WARNING: Always verify that the power to the controller is off before you make wiring
connections.
1. Turn off power to the controller.
2. Place the controller’s power switch in the OFF position.
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 hydrogen transmitter through one of the conduit hubs at
the controller housing.
CAUTION: Do not route power and transmitter wiring through the same controller conduit hub. The
power cable may disrupt the transmission of the transmitter signal to the controller.
11. Connect the wires to the applicable detector/transmitter terminal strip at the controller as shown in
Figure 4.