RKI Instruments 65-2434RK - Manual (Page 13)

65-2434RK CO Transmitter • 9
Symptoms
• The transmitter responds slowly or does not respond during the monthly response
test.
• Unable to accurately set the zero or response reading during the calibration
procedure.
• The transmitter requires frequent calibration.
NOTE: Under “normal” circumstances, the transmitter requires calibration once every
three months. Some applications may require a more frequent calibration
schedule.
Probable causes
• The calibration cylinder is low, out-dated, or defective.
• The transmitter is malfunctioning.
Recommended action
1. Verify that the calibration cylinder contains an adequate supply of a fresh test sample.
2. If the calibration/response difficulties continue, replace the CO sensor as described
later in this section.
3. If the calibration/response difficulties continue, contact RKI Instruments, Inc. for
further instruction.
Replacing Components of the CO Transmitter
This section includes procedures to replace the CO sensor, amplifier PCB, and charcoal
filter.
Replacing the Sensor
1. Turn off the controller.
2. Turn off or unplug incoming power to the controller.
3. Remove the enclosure’s cover by unscrewing the four cover screws, one at each
corner.
4. Unplug the CO sensor from the amplifier PCB.
5. Remove the rubber boot and charcoal filter from the old sensor and install onto the
replacement sensor.
6. Carefully plug the replacement sensor into the socket pattern on the amplifier PCB.
NOTE: Match the sensor’s male pins with the four female sockets as you plug the sensor
into the sockets.
7. Secure the cover to the enclosure.
8. Turn on or plug in incoming power to the controller.
9. Turn on the controller.
CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the
next step.
10. Calibrate the replacement sensor as described in the Calibration section of this
manual.