RKI Instruments 65-2335RK - Manual (Page 15)

65-2335RK CO Transmitter • 11
Replacing Components of the CO Transmitter
This section includes a procedure to replace the CO plug-in sensor, charcoal filter, and
amplifier. A procedure to replace the entire detector assembly is at the end of this section.
In most cases, it is not necessary to replace the entire detector assembly.
Replacing the Plug-In CO Sensor
CAUTION: The sensor contains electrolyte which is a dilute acid. Do not disassemble the sensor
when replacing it with a new one. If sensor electrolyte comes in contact with your
skin, wash affected area thoroughly with soap and water.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Unscrew the detector housing cap from the detection housing body. Make sure not to
lose the cap gasket.
4. Unplug and remove the CO plug-in sensor with the boot and charcoal filter attached.
5. Remove the rubber boot and charcoal filter from old sensor.
6. Install the rubber boot with charcoal filter onto the replacement sensor’s face.
7. Carefully plug the replacement sensor into the four-socket pattern that is located in
the detector housing.
8. Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
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 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
matter.
• The transmitter is
malfunctioning.
1. Verify that the calibration cylinder
contains an adequate supply of a
fresh test sample.
2. Check the face of the detector
housing cap and remove any
particulate contamination from the
hydrophobic membrane if necessary.
3. Verify that the calibration gas
concentration is appropriate for the
transmitter. Zero emission air (20.9%
oxygen) is normally used for a zero
adjustment if the environment is
suspect and 50 PPM CO in air is
normally used for a response
adjustment.
4. If the calibration/response difficulties
continue, replace the sensor as
described later in this section.
5. If the calibration/response difficulties
continue, contact RKI for further
instruction.
Unexplained
Upscale
Readings or
Alarms • Controller indicates a
CO reading that
cannot be verified.
• CO alarms occur at
the controller that
cannot be explained.
• Charcoal filter is
saturated and no
longer scrubbing out
interfering gases.
1. Replace charcoal filter.
2. If difficulties continue, contact RKI for
further instruction.
Table 2:Troubleshooting the CO Transmitter (cont.)
Condition Symptom(s) Probable Causes Recommended Action