RKI Instruments 65-2443 User manual

RKI Instruments, Inc.
www.rkiinstruments.com
65-2443
PPM Hydrogen Transmitter
Operator’s Manual
Part Number: 71-0542
Revision: P1
Released: 12/29/20

2 • 65-2443 PPM 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 6 and 12 months, but can be
required more often or less often based on your usage.

65-2443 PPM 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 the 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. Parts must be returned to RKI Instruments, Inc. for repair or replacement. 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 instruction manual. This warranty indicates the full extend 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 only 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. Warranty
covers parts and labor performed at RKI Instruments, Inc. only, and does not cover field labor or
shipment of parts back to RKI.
a) Pump diaphragms and valves c) Batteries
b) Fuses d) Filter elements

4 • 65-2443 PPM Hydrogen Transmitter
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PPM Hydrogen Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mounting the PPM Hydrogen Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Wiring the PPM Hydrogen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Transmitter Burn-In Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Replacing Components of the PPM Hydrogen Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Calibration Kit Humidifier Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Span Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Linearization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

65-2443 PPM Hydrogen Transmitter • 5
Overview
This manual describes the 65-2443 ppm 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
transmitter.
Specifications
Table 1 lists specifications for the ppm hydrogen transmitter.
WARNING: When using the 65-2443, you must follow the instructions and warnings in this
manual to assure proper and safe operation of the 65-2443 and to minimize the risk of
personal injury. Be sure to maintain and periodically calibrate the 65-2443 as
described in this manual.
Table 1:Specifications
Target Gas Hydrogen (H2)
Detection Range 0 - 2,000 ppm
Area Classification Explosionproof for Class I, Groups B, C, and D
Sampling Method Diffusion
Input Power 10 - 30 VDC
Signal Output 4 to 20 mA with impedance maximums listed below:
• 12 VDC input: 500 Ohms
• 24 VDC input: 1000 Ohms
Response Time 90% in 45 seconds

6 • 65-2443 PPM Hydrogen Transmitter
Description
This section describes the ppm hydrogen transmitter’s components. It is a 4 to 20 mA type detector
head. It consists of the ppm hydrogen detector, amplifier, and junction box.
Figure 1: Component Location
Amplifier
J-Box
Hydrogen Detector
LINEAR
SPAN
Reducing Bushing,
3/4 NPT to1/2 NPT
DETECTOR PWR / SIG
SWBR

65-2443 PPM Hydrogen Transmitter • 7
PPM Hydrogen Detector
The ppm hydrogen detector is a MOS type (metal oxide semiconductor) detector packaged in a 1/2
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
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. Three color-
coded leads extend from the top of the detector. The leads allow you to connect the detector to the
amplifier.
The detector has a built in molecular sieve that only allows hydrogen to diffuse into the detector. The
output of the detector is non-linear and is linearized by the amplifier (see below).
Amplifier
The amplifier converts the non-linear electrical output from the detector to a linear 4 to 20 mA signal
that corresponds to the detection range and transmits the signal to a gas monitoring controller. The
amplifier includes the terminal strips, span pot, linearizing 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 three 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 page 10 for all wiring
procedures related to the transmitter.
+ Test Point, Red
RBW
DETECTOR
- Test Point, Black
Mounting Screw
w/ flat and lock washer
SPAN
PW R / SIG
S
LINEAR
Factory Use Jumpers
Detector Terminal Strip
Span Pot
Controller Terminal Strip
Linearizing Pot

8 • 65-2443 PPM Hydrogen Transmitter
Span Pot
The span pot is located to the left of the detector terminal strip (see Figure 2). Use a small flat blade
screwdriver to turn the span pot’s adjustment screw and adjust the amplifier’s full scale response
output during the calibration procedure.
Linearizing Pot
The linearizing pot (labeled LINEAR) is located in the bottom left corner of the amplifier (see
Figure 2). Use a small flat blade screwdriver to turn the linearizing pot’s adjustment screw while
applying mid-scale gas to linearize the transmitter’s output during the calibration procedure.
Test Points
The test points are on the right side of the amplifier (see Figure 2). The test points produce a 100 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
on the bottom is the negative (-) test point and the red test point on the top 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 also protects the amplifier and wiring connections made to the amplifier. Use the top 3/4
NPT 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.

65-2443 PPM Hydrogen Transmitter • 9
Installation
This section describes procedures to mount the ppm hydrogen transmitter in the monitoring
environment and wire the transmitter to a controller.
Mounting the PPM Hydrogen Transmitter
Figure 3: Mounting the PPM 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 hydrogen, which is lighter than
air, mount the transmitter near the ceiling or where hydrogen is most likely to accumulate.
2. At the monitoring site you select, hang or mount the junction box with the detector facing down
(see Figure 3).
.38
.75
2.70
JBox
Rubber
Spacers,
3X
3/4 NPT Female
3.65
Hydrogen
Detector
3/4 x 1/2 Reducing
Bushing
7.5 max

10 • 65-2443 PPM Hydrogen Transmitter
Wiring the PPM Hydrogen Transmitter
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 ppm 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.

65-2443 PPM Hydrogen Transmitter • 11
11. Connect the wires to the applicable detector/transmitter terminal strip at the controller as shown in
Figure 4.
Figure 4: Wiring the PPM 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.
4-20mAIn(S)
+24VDC
-(DCGround)
Controller
Detector Wires
Black
Red
Cable Shield
PWR /SIG
S
SPAN
B R
LINEAR
DETECTOR
White
W

12 • 65-2443 PPM Hydrogen Transmitter
Start Up
This section describes procedures to start up the ppm 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.
NOTE: When a transmitter is first powered up after installation or being off power for an extended
period, its output may be high enough to cause an alarm or low enough to indicate a failure
for a brief period before stabilizing within a few minutes. Be sure to make arrangements so
that this does not cause unwanted alarms.
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.
Transmitter Burn-In Period
Once power has been applied to the transmitter, it will take several days for the transmitter signal to the
controller to stabilize completely. This is the burn-in period. The zero reading should settle down close
to zero within 2-3 hours of applying power. The transmitter should be burned in for 5-7 days for a
stable zero and accurate response to gas. The transmitter is calibrated at the factory before shipment
and it is not necessary to calibrate the transmitter after startup. If calibration of the transmitter after
startup is desired, wait at least 5 days after startup before calibrating the transmitter. A burn-in period
of 7 days is recommended. See page 16 for calibration instructions.
Setting the Zero Signal
The detector’s zero setting is controlled by electronics and is not user-adjustable.

65-2443 PPM Hydrogen Transmitter • 13
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
ppm hydrogen transmitter. It includes daily and quarterly procedures.
Daily
Verify a display reading of 0 ppm at the controller. Investigate significant changes in the display
reading.
Biannual
Calibrate the ppm hydrogen transmitter as described on page 16.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended action for
problems you may encounter with the ppm 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 ppm 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 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.
Slow or No
Response/
Difficult or
Unable to
Calibrate
• Unable to accurately
set the span or
linearizing response
during calibration.
• Transmitter requires
frequent calibration.
Note: Under “normal”
circumstances, the
transmitter requires
calibration once every
6 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 transmitter is
malfunctioning.
1. Verify that the calibration
cylinder contains an adequate
supply of gas.
2. Verify that the regulator used for
calibration is a 0.5 LPM
regulator.
3. If the calibration/response
difficulties continue, replace the
detector.
4. If the calibration/response
difficulties continue, contact
RKI for further instruction.

14 • 65-2443 PPM Hydrogen Transmitter
Replacing Components of the PPM Hydrogen Transmitter
This section includes procedures to replace the ppm hydrogen detector and amplifier.
Replacing the PPM Hydrogen Detector
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. 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.
9. Re-install the detector terminal strip into its socket.
NOTE: When a transmitter is first powered up with a new detector, its output may be high enough to
cause an alarm or low enough to indicate a failure for a brief period before stabilizing within
a few minutes. Be sure to make arrangements so that this does not cause unwanted alarms.
10. Turn on power to the controller.
11. Turn on the controller and place it into normal operation.
12. Allow the transmitter to run for 3 hours.
13. Perform a preliminary calibration as described on page 16. This will be a temporary calibration
since the new ppm detector must burn-in before it can be properly calibrated.
14. Allow the replacement detector to burn-in for at least 5 days before you continue with the next
step. A burn-in period of 7 days is recommended.
15. After the burn-in period, calibrate the transmitter as described on page 16.
Table 3:Reconnecting the PPM Detector to the Amplifier
Detector Lead Detector Terminal Strip
Red R
White W
Black B

65-2443 PPM Hydrogen Transmitter • 15
Replacing the Amplifier
If you are replacing the amplifier, it is likely that the transmitter has been off power for an extended
period. Make sure to follow the preliminary calibration recommendation and the burn-in period
recommendation before making the final calibration.
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 detector and controller terminal 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 Tables 4 and 5 below.
8. 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.
NOTE: When a transmitter is first powered up with a new amplifier, the initial output may be either
high or below zero. 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.
Table 4:Reconnecting the PPM Hydrogen Amplifier to the Controller
Amplifier’s Controller
Terminal Strip
Controller’s Transmitter
Terminal Strip (typical)
--(DC-)
S S (4 - 20 mA In)
++24V
Table 5:Reconnecting the PPM Hydrogen Detector to the Amplifier
Detector Lead Amplifier’s Detector
Terminal Strip
Red R
White W
Black B

16 • 65-2443 PPM Hydrogen Transmitter
11. Allow the transmitter to run for 3 hours.
12. Perform a preliminary calibration as described on page 16. This will be a temporary calibration
since the new ppm detector must burn-in before it can be properly calibrated.
13. Allow the replacement detector to burn-in for at least 5 days before you continue with the next
step. A burn-in period of 7 days is recommended.
14. After the burn-in period, calibrate the transmitter as described on page 16.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all ppm hydrogen transmitter
applications, a calibration frequency of every 6 to 12 months is adequate for most applications. Unless
experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a
calibration frequency of every 6 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 6
months may be necessary.
Calibration
This section describes how to calibrate the ppm hydrogen transmitter. It includes procedures to prepare
for calibration, set the span reading, set the linearization, and return to normal operation.
WARNING: The controller is not an active gas monitoring device during the calibration
procedure.
NOTE: The following procedure assumes the use of a calibration kit which includes 2 calibration gas
cylinders, a 0.5 LPM fixed flow regulator with an on/off knob, a calibration cup for the
detector, and a humidifier tube to connect the regulator to the calibration cup.
Calibration Kit Humidifier Tube
The ppm hydrogen detector requires normal atmospheric humidity levels to respond properly to
hydrogen. Normal atmospheric humidity variations do not affect the detector’s response to hydrogen
in ambient air, but the ultra low humidity level of gas from a calibration cylinder requires that the
calibration sample be humidified for the detector to respond properly. The calibration kit for the ppm
hydrogen transmitter includes a humidifier tube that is not normally included in other calibration kits.
This humidifier tube humidifies the calibration sample flowing through it by absorbing humidity from
the ambient air and adding it to the sample. The humidifier tube is included in the “Parts List” on
page 18.

65-2443 PPM Hydrogen Transmitter • 17
WARNING: A humidifier tube must be used when calibrating the ppm hydrogen transmitter for
the detector to respond properly to the calibration gas. Failure to use a humidifier
tube will result in an inaccurate calibration.
Preparing for Calibration
1. Screw the calibration cup onto the bottom of the hydrogen detector.
2. Use the humidifier tube to connect the regulator to the calibration cup.
3. Set a voltmeter to measure in the millivolt (mV) range.
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. Place the controller into its calibration mode or disable external alarms.
NOTE: Calibrating the ppm hydrogen transmitter may cause alarms. Be sure to put the controller into
its calibration program or disable external alarms before continuing.
Setting the Zero Reading
The detector’s zero setting is controlled by electronics and is not user-adjustable.
Setting the Span Reading
1. Screw the regulator into the 2,000 ppm H2calibration cylinder.
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the calibration gas to flow for 2 minutes.
4. Verify a reading of 500 mV (±2 mV) on the voltmeter. If necessary, use the span pot on the
amplifier to adjust the reading.
5. Turn the regulator knob clockwise to close the regulator.
6. Unscrew the regulator from the 2,000 ppm H2calibration cylinder.
Setting the Linearization
1. Screw the regulator into the 1,000 ppm H2calibration cylinder.
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the calibration gas to flow for 2 minutes.
4. Verify a reading of 300 mV (±2 mV) on the voltmeter. If necessary, use the linear pot on the
amplifier to adjust the reading.
5. Turn the regulator knob clockwise to close the regulator.
6. Unscrew the regulator from the 1,000 ppm H2calibration cylinder.

18 • 65-2443 PPM Hydrogen Transmitter
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 humidifer tube.
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 ppm.
6. Store the components of the calibration kit in a safe and convenient place.
Parts List
Table 6 lists replacement parts and accessories for the ppm hydrogen transmitter.
Table 6:Parts List
Part Number Description
18-0400RK Junction box with cover
33-2001RK-01 Humidifier tube w/3/16” tubing on ends, for calibration kit
57-1070-01 Amplifier (specify target gas and detection range)
61-0160RK PPM hydrogen detector
65-2443 PPM hydrogen transmitter (includes detector and amplifier)
71-0542 65-2443 PPM Hydrogen Transmitter Operator’s Manual (this document)
81-0000RK-01 Calibration cylinder, 1,000 ppm hydrogen in air, 34 liter steel
81-0000RK-03 Calibration cylinder, 1,000 ppm hydrogen in air, 103 liter
81-0000RK-21 Calibration cylinder, 2,000 ppm hydrogen in air, 34 liter steel
81-0000RK-23 Calibration cylinder, 2,000 ppm hydrogen in air, 103 liter
81-1050RK Regulator, 0.5 LPM, with pressure gauge and flow control knob, for 17 liter and 34 liter steel
calibration cylinders (cylinders with external threads)
81-1051RK Regulator, 0.5 LPM, with pressure gauge and flow control knob, for 34 liter aluminum, 58
liter, and 103 liter steel calibration cylinders (cylinders with internal threads)
81-1117RK Calibration cup
81-F072RK Calibration kit, includes regulator, humidifier tube, calibration cup, 103 liter 1,000 ppm
hydrogen calibration cylinder, and 103 liter 2,000 ppm hydrogen calibration cylinder
81-F072RK-LV Calibration kit, includes regulator, humidifier tube, calibration cup, 34 liter 1,000 ppm hydro-
gen steel calibration cylinder, and 34 liter 2,000 ppm hydrogen steel calibration cylinder