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.

65-2462RK Hydrogen Transmitter • 11
Figure 4: Wiring the Hydrogen Transmitter to a Controller
12. 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.
Cable Shield
Red
Black
+24VDC
Controller or
Recording Device
4-20mAIn(S)
- (DC Ground)
S
PWR / SIG
W GR LEL
Green Detector Wires
White
B

12 • 65-2462RK Hydrogen Transmitter
Start Up
This section describes procedures to start up the hydrogen transmitter and place the transmitter into
normal operation.
Introducing Incoming Power
1. Complete the installation procedures described earlier in this manual.
2. Verify that the power wiring to the controller is correct and secure. Refer to the controller
operator’s manual.
3. Turn on power to the controller.
4. Turn on the controller.
5. Verify that the controller is on and operating properly. Refer to the controller operator’s manual.
CAUTION: Allow the detector to warm up for 5 minutes before you continue with the next section,
“Setting the Zero Signal”.
Setting the Zero Signal
WARNING: Do not remove the junction box cover while the circuits are energized unless the area
is determined to be non-hazardous. Keep the junction box cover tightly closed during
operation.
CAUTION: If you suspect the presence of hydrogen in the monitoring environment, use the
calibration kit and the zero air calibration cylinder to introduce “fresh air” to the
detector and verify an accurate zero setting. See “Calibration” on page 16 for
instructions to apply zero air when setting the zero signal.
As shipped from the factory, the detector is zeroed with N2and calibrated with H2in N2. If the sample
area has a background that is not N2(such as fresh air or helium), you must rezero the detector while
applying that background gas.
1. Screw the calibration cup onto the bottom of the detector.
2. Use the sample tubing to connect the regulator to the calibration cup.
3. Screw the regulator into a cylinder into a calibration cylinder containing the background gas (such
as zero air or helium).
4. Unscrew and remove the junction box cover from the junction box.
5. Set a voltmeter to measure in the millivolt (mV) range.
6. Plug the voltmeter leads into the test points on the amplifier. Plug the positive lead into the red +
test point; plug the negative lead into the black -test point.
7. Turn the regulator knob counterclockwise to open the regulator.
8. Allow the calibration gas to flow for one minute.
9. Verify a voltmeter reading of 100 mV (±2 mV).

65-2462RK Hydrogen Transmitter • 13
10. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the voltmeter reading is
100 mV (±2 mV).
11. Turn the regulator knob clockwise to close the regulator.
12. Unscrew the regulator from the calibration cylinder.
13. Unscrew the calibration cup from the bottom of the detector.
14. Remove the voltmeter leads from the test points.
15. Secure the junction box cover to the junction box.
Maintenance
This section describes maintenance procedures. It includes preventive maintenance, troubleshooting,
and component replacement procedures.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum performance of the
hydrogen transmitter. It includes daily and quarterly procedures.
Daily
Verify a display reading of 0 %volume at the controller. Investigate significant changes in the display
reading.
Quarterly
Calibrate the hydrogen transmitter as described in “Calibration” on page 16 of this manual.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended action for
problems you may encounter with the hydrogen transmitter.
NOTE: This troubleshooting guide describes transmitter problems only. See the controller operator’s
manual for problems you may encounter with the controller.
Table 2:Troubleshooting the Hydrogen Transmitter
Condition Symptom(s) Probable Causes Recommended Action
Fail
Condition
• Controller
indicates a fail
condition.
• The transmitter
wiring is
disconnected or
misconnected.
• The transmitter’s
zero reading is low
enough to cause a
fail condition.
• The transmitter is
malfunctioning.
1. Verify that the transmitter wiring
is correct and secure.
2. Calibrate the transmitter.
3. If the fail condition continues,
replace the detector.
4. If the fail condition continues,
contact RKI for further
instruction.

14 • 65-2462RK Hydrogen Transmitter
Replacing Components of the Hydrogen Transmitter
This section includes procedures to replace the hydrogen detector and amplifier.
Replacing the Hydrogen Detector
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. Remove the detector terminal strip from its socket.
5. Disconnect the detector leads from the detector terminal strip. Note the position of the color-coded
leads as you remove them.
6. Unscrew the detector from the junction box.
7. Guide the detector leads of the replacement detector through the bottom conduit hub of the
junction box, then screw the mounting threads of the detector into the conduit hub.
8. Connect the detector leads to the detector terminal strip as shown in Table 3 below and Figure 4 on
page 11 of this manual.
Slow or No
Response/
Difficult or
Unable to
Calibrate
• Unable to
accurately set the
zero or response
reading during
calibration.
•Transmitter
requires frequent
calibration.
Note: Under
“normal”
circumstances, the
transmitter requires
calibration once
every 3 months.
Some applications
may require a more
frequent calibration
schedule.
• The calibration
cylinder is low, out-
dated, or defective.
• The calibration gas
flow rate is too low.
• The calibration gas
is not an appropriate
concentration.
• The transmitter is
malfunctioning.
1. Verify that the calibration cylinder
contains an adequate supply of a
fresh test sample.
2. Verify that the regulator used for
calibration is a 0.5 LPM regulator.
3. Verify that the calibration gas
concentration is appropriate for
the transmitter. The concentration
should be in the detection range,
preferably about half of the
detection range.
4. If the calibration/response
difficulties continue, replace the
detector.
5. If the calibration/response
difficulties continue, contact RKI
for further instruction.
Table 3:Reconnecting the Hydrogen
Detector to the Amplifier
Detector Lead Detector Terminal Strip
Red LEL “R”
White LEL “W”
Green LEL “G”
Black LEL “B”
Table 2:Troubleshooting the Hydrogen Transmitter (cont.)
Condition Symptom(s) Probable Causes Recommended Action

65-2462RK Hydrogen Transmitter • 15
9. Turn on power to the controller.
10. Turn on the controller and place it into normal operation.
CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with the
next step.
11. Calibrate the transmitter as described in “Calibration” on page 16 of this manual.
Replacing the Amplifier
1. Turn off power to the controller.
2. Place the controller’s on/off switch in the OFF position.
3. Remove the junction box cover.
4. Unplug the detector terminal strip and controller terminal strip from their sockets. You may leave
the wires connected to the terminal strips.
5. Unscrew and remove the screw with the flat and lock washers that secures the amplifier to the
junction box.
6. Remove the old amplifier.
7. Install the amplifier into the junction box with the screw, lock washer, and flat washer you
removed in Step 5 above. A foam gasket that orients the amplifier and keeps it from rotating is
installed on the bottom of the amplifier. Make sure the amplifier is seated flat in the junction box.
8. Install the detector and controller terminals strips into their sockets on the new amplifier as shown
in Figure 4 on page 11 of this manual. If controller leads or detector leads were removed during
this procedure, refer to Table 4 and Table 5 below.
Table 4:Reconnecting the Amplifier to the Controller
Amplifier Controller
Terminal Strip
Controller
Transmitter Terminal
Strip (typical)
PWR/SIG “-” - (DC -)
PWR/SIG “S” S (4 - 20 mA In)
PWR/SIG “+” + 24V
Table 5:Reconnecting the LEL Detector to the Amplifier
Amplifier Detector
Terminal Strip Detector Lead
DETECTOR “R” RED
DETECTOR “W” WHT
DETECTOR “G” GREEN
DETECTOR “B” BLK

16 • 65-2462RK Hydrogen Transmitter
NOTE: When a transmitter is first powered up with a new amplifier, the initial output may be either
high or below zero depending on the setting of the zero pot. Be sure to make arrangements so
that this does not cause unwanted alarms.
9. Turn on power to the controller.
10. Turn on the controller and place it into normal operation.
11. Allow the transmitter to warmup for 5 minutes.
12. Calibrate the transmitter as described in “Calibration” on page 16 of this manual.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a calibration
frequency of every 9 to 12 months is adequate for most hydrogen transmitter applications. Unless
experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a
calibration frequency of every 9 months.
If an application is not very demanding, for example detection in a clean, temperature controlled
environment where hydrogen is not normally present and calibration adjustments are minimal at
calibration, then a calibration frequency of every 12 months is adequate.
If an application is very demanding, for example if hydrogen is present often and in significant
concentrations or the environment is not well controlled, then more frequent calibration than every 9
months may be necessary. If potential catalyst poisons are known or likely to be present, more frequent
calibration than every 9 months will be necessary.
Calibration
This section describes how to calibrate the H2detector. It includes procedures to prepare for
calibration, zero with nitrogen, set the response reading, zero with background gas, and return to
normal operation.
NOTE: This procedure describes calibration using a 0.5 LPM fixed flow regulator with an on/off
knob, a calibration cup for the detector, and a short piece of sample tubing to connect the
regulator to the calibration cup, a 100% N2cylinder, a 4% H2cylinder, and a zero air
calibration cylinder.
Preparing for Calibration
CAUTION: This procedure may cause alarms at the controller. Take appropriate action to avoid this,
such as entering the calibration mode at the controller.
1. Screw the calibration cup onto the bottom of the detector.
2. Use the sample tubing to connect the regulator to the calibration cup.
3. Set a voltmeter to measure in the millivolt (mV) range.

65-2462RK Hydrogen Transmitter • 17
4. Remove the junction box cover, then plug the voltmeter leads into the test points on the amplifier.
Plug the positive lead into the red + test point; plug the negative lead into the black - test point.
5. Use the following formula to determine the correct test points output for the calibrating sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a calibrating sample of 4% volume H2and a fullscale setting of 10% volume,
the correct output for the H2test points is 260 mV.
260 (mV) = (4/10) X 400 +100
Zeroing with Nitrogen
NOTE: If you can verify a fresh air environment, it is not necessary to use the zero air calibration
cylinder to set the zero reading.
1. Screw the regulator into the 100% N2calibration cylinder.
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the gas to flow for one minute.
4. Verify a voltmeter reading of 100 mV ± 2 mV at the H2test points as described in the Preparing for
Calibration section above.
5. If necessary, use a small flat-blade screwdriver to adjust the zero pot for the H2channel until the
voltmeter reading is 100 mV ± 2 mV.
6. Turn the regulator knob clockwise to close the regulator.
7. Unscrew the regulator from the calibration cylinder. Leave the sample tubing connected to the
regulator and the calibration cup.
Setting the Response Reading
1. Screw the regulator into a 4% H2calibration cylinder.
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the calibration gas to flow for one minute.
4. Check the mV output on the H2transmitter test points and verify that the reading matches the
response reading (±2 mV) you determined earlier.
5. If necessary, use the span pot on the H2transmitter to adjust the reading to match the correct
response reading.
6. Turn the regulator knob clockwise to close the regulator.
7. Unscrew the regulator from the calibration cylinder. Leave the sample tubing connected to the
regulator and the calibration cup.

18 • 65-2462RK Hydrogen Transmitter
Zeroing with Background Gas
If the sample area has a background gas that is not N2(such as fresh air or helium), you must rezero the
detector while applying that background gas.
1. Screw the regulator into a calibration cylinder containing the background gas (such as zero air or
helium).
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the calibration gas to flow for one minute.
4. Verify a voltmeter reading of 100 mV ± 2 mV at the H2test points as described in the Preparing for
Calibration section above.
5. If necessary, use a small flat-blade screwdriver to adjust the zero pot for the H2channel until the
voltmeter reading is 100 mV ± 2 mV.
6. Turn the regulator knob clockwise to close the regulator.
7. Unscrew the regulator from the calibration cylinder.
Returning to Normal Operation
1. Remove the voltmeter leads from the amplifier test points.
2. Unscrew the calibration cup from the detector.
NOTE: For convenience, leave the regulator and calibration cup connected by the sample tubing.
3. Secure the junction box cover to the junction box.
4. When the controller display reading falls below the alarm setpoints, return the controller to normal
operation.
5. Verify that the controller display reading decreases and stabilizes at 0% volume.
6. Store the components of the calibration kit in a safe and convenient place.

65-2462RK Hydrogen Transmitter • 19
Parts List
Table 6 lists replacement parts and accessories for the hydrogen transmitter.
Table 6:Parts List
Part Number Description
06-1248RK Sample tubing (3/16 in. x 5/16 in.; specify length when ordering)
18-0001RK Reducer, 3/4 in. NPT x 1/2 in. NPT
18-0400RK-01 Junction box with spacers
57-1053RK Amplifier with gasket (specify target gas and that the 61-0140RK detector is
being used when ordering)
65-2462RK Hydrogen transmitter (includes detector and amplifier; specify target gas when
ordering)
71-0554 65-2462RK Hydrogen Transmitter Operator’s Manual (this document)
81-0022RK-01 Calibration cylinders, 4% volume H2in N2, 34 liter steel
81-0076RK-01 Calibration cylinder, zero air, 34 liter steel
81-0078RK-01 Calibration cylinder, 100% nitrogen, 34 liter steel
81-0078RK-03 Calibration cylinder, 100% nitrogen, 103 liter
81-1050RK Regulator, 0.5 liter/minute; with pressure gauge and flow control knob, for 17
liter and 34 liter steel calibration cylinders (cylinders with external threads)
81-1117RK Calibration cup
TE-7550-01 Hydrogen detector