65-2394RK-CH4-4 Combustible Gas Transmitter • 13
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the combustible gas transmitter.
NOTE:
This troubleshooting guide describes transmitter problems only. See the
controller operator’s manual for problems you may encounter with the
controller.
Replacing Components of the Combustible Gas Transmitter
This section includes procedures to replace the combustible gas detector and amplifier.
Replacing the IR LEL Detector
NOTE:
The IR LEL detector is installed on the junction box that does not house the
amplifier. This junction box was likely installed somewhere difficult to access.
1.
Turn off the controller.
2.
Turn off or unplug power to the controller.
3.
Unscrew the calibration cup/splash guard from the detector.
4.
Remove the detector junction box’s cover from the junction box.
Table 2:Troubleshooting the Combustible Gas Transmitter
Condition
Symptom(s)
Probable Causes
Recommended Action
Fail Condition
• Controller indicates a
fail condition.
• The detector-to-
amplifier or amplifier-
to-controller 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 detector-to-amplifier
and amplifier-to-controller 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
• Transmitter responds
slowly or does not
respond to response
test.
• 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 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 calibration gas is
not an appropriate
concentration.
• The transmitter is
malfunctioning.
• The flexible tubing to
the calibration cup/
splash guard has
become kinked,
blocked, or
disconnected.
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. Verify that the flexible tubing to the
calibration cup/splash guard is clear
and connected to the calibration cup/
splash guard.
5. If the calibration/response difficulties
continue, replace the detector.
6. If the calibration/response difficulties
continue, contact RKI for further
instruction.
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