RKI Instruments 65-2435RK - Manual (Page 13)

65-2435RK CO Transmitter • 13
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 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 Sensor
4. Turn off the controller.
5. Turn off or unplug incoming power at the power source end.
6. Unscrew the bottom section of the CO detector housing from the top section.
NOTE: Be sure the two cap gaskets remain seated and that they don’t fall out.
7. Unplug and remove the CO sensor with the boot and charcoal filter attached.
8. Remove the rubber boot and charcoal filter from old sensor.
9. Install the rubber boot with charcoal filter onto the replacement sensor’s face.
10. Carefully plug the replacement sensor into the socket pattern that is located in the top section
of the detector housing.
NOTE: Match the sensor’s male pins with the four female sockets as you plug the sensor into the
socket.
11. Screw the bottom section of the detector housing onto the top section.
12. Turn on or plug in incoming power at the power source end.
13. Turn on the controller.
CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the
next step.
14. Set the null potentiometer on the amplifier as described in the Setting the Null Potentiometer
section.