65-2422RK-05 H
2
S Transmitter • 15
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
•
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 procedure to replace the H
2
S 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
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 incoming power at the controller.
3. Unscrew the bottom section of the H
2
S detector housing from the top section.
4. Unplug and remove the H
2
S sensor with the rubber boot and spacer attached.
5. Remove the rubber boot and spacer from the old sensor.
