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
