RKI Instruments 65-2424RK - Manual (Page 13)

65-2424RK H
2
S Transmitter • 9
Recommended action
• Verify that the transmitter wiring is correct and secure.
• Calibrate the transmitter.
• If the fail condition continues, replace the H
2
S sensor.
• If the fail condition continues, contact RKI for further instruction.
Slow or No Response/Difficult or Unable to Calibrate
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 H
2
S 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 H
2
S Transmitter
This section includes procedures to replace the H
2
S sensor, amplifier PCB, and charcoal
filter.
Replacing the Sensor
1. Turn off the controller.
2. Turn off or unplug incoming power at the power source end.
3. Remove the enclosure’s cover by unscrewing the four cover screws, one at each
corner.
4. Unplug the H
2
S sensor from the amplifier PCB.
5. Remove the rubber boot and sealing spacer 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.