RKI Instruments GasWatch 1 - Manual (Page 15)

GasWatch Instruction Manual (Two-Gas) Maintenance • 11
Maintenance
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the GasWatch.
Fail condition
Symptoms
• CO/H
2
S: the gas reading is replaced by FAIL.
• CO/H
2
S: the buzzer is sounding a double pulsing tone.
• O
2
: the gas reading is 0.0% vol.
• O
2
: the buzzer is sounding a pulsing tone.
Probable causes
• The sensor is missing or not plugged in properly.
• The sensor requires calibration.
• The sensor is defective.
Recommended action
1. Determine which sensor is initiating the fail condition.
2. Verify the sensor is plugged in properly.
3. Calibrate the sensor as described on page 9.
4. If the fail condition continues, replace the sensor as described later in this section.
5. If the fail condition continues after you replace the sensor, contact RKI Instruments,
Inc., for further instruction.
Slow or no response/difficult or unable to calibrate
Symptoms
• Unable to accurately set the response reading during the calibration procedure.
• The GasWatch requires frequent calibration.
NOTE: Under “normal” circumstances, the GasWatch requires calibration every 3
months. Some applications may require a more frequent calibration schedule.
Probable causes
• The calibration cylinder is low, out-dated, or defective.
• The sensor dust cover is dirty or clogged.
• The sensor is defective or its sensitivity reduced due to age.
Recommended action
1. Verify that the calibration cylinder for the affected sensor contains an adequate supply
of a fresh test sample.
2. Inspect the sensor dust cover for the affected sensor to make sure it is not dirty or
clogged. If necessary, replace the cover as described on page 12.