RKI Instruments 65-2497RK - Manual (Page 12)

8 • 65-2494RK/65-2497RK Oxygen Detector
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the oxygen detector.
NOTE: This troubleshooting guide describes detector problems only. See the controller
operator’s manual for problems you may encounter with the controller.
Table 2: Troubleshooting the Oxygen Detector
Condition Symptom(s) Probable Causes Recommended Action
Fail Condition • Controller indicates a
fail condition.
• The detector wiring is
disconnected or
misconnected.
• The plug-in sensor is
not properly plugged
into the socket pattern
in the detector housing
body.
• The detector’s zero
reading is low enough
to cause a fail
condition.
• The detector is
malfunctioning.
1. Verify that the detector wiring is
correct and secure.
2. Confirm that the plug-in sensor is
installed properly.
3. Perform a fresh air adjustment. A full
calibration is recommended.
4. If the fail condition continues, replace
the plug-in sensor as described later
in this section.
5. If the fail condition continues, contact
RKI for further instruction.
Slow or No
Response/
Difficult or
Unable to
Calibrate • Detector responds
slowly or does not
respond to response
test.
• Unable to accurately
set the fresh air or
zero reading during
calibration.
• Detector 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 is
not an appropriate
concentration.
• The membrane on the
detector housing cap is
blocked with dirt or
some other particulate
contamination.
• The detector is
malfunctioning.
1. Verify that the calibration cylinder
contains an adequate supply of a
fresh test sample.
2. Verify that the calibration gas
concentration is appropriate for the
transmitter. Zero emission air (20.9%
oxygen) is normally used for a fresh
air adjustment if the environment is
suspect and 100% nitrogen (0%
oxygen) is normally used for a zero
adjustment.
3. Check the sensor face for dirt. Clean
if necessary.
4. Check the face of the detector
housing cap and remove any
particulate contamination from the
hydrophobic membrane if necessary.
If the membrane appears saturated
with contamination or damaged,
replace the membrane as described
in the next section.
5. If the calibration/response difficulties
continue, replace the plug-in sensor
as described later in this section.
6. If the calibration/response difficulties
continue, contact RKI for further
instruction.