RKI Instruments 65-2498RK - Manual (Page 12)

8 • 65-2495RK/65-2498RK H
2
S Detector
5. Unscrew the calibration cup from the H
2
S detector. Make sure that you do not loosen
the detector housing cap when you unscrew the calibration cup.
6. When the controller display reading falls below the alarm setpoints, return the
controller to normal operation.
Quarterly
Calibrate the H
2
S detector as described in “Calibration” on page 12.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the H
2
S detector.
NOTE: This troubleshooting guide describes detector problems only. See the controller
operator’s manual for problems you may encounter with the controller.
Fail Condition
Symptoms
• The controller indicates a fail condition.
Probable causes
• The detector wiring is disconnected or misconnected.
• The plug-in sensor is not properly plugged into the four-socket pattern in the detector
housing body.
• The detector’s zero reading is low enough to cause a fail condition.
• The detector is malfunctioning.
Recommended action
• Verify that the detector wiring is correct and secure.
• Confirm that the plug-in sensor is installed properly.
• Perform a zero (fresh air) adjustment. A full calibration is recommended.
• If the fail condition continues, replace the plug-in sensor as described later in this
section.
• If the fail condition continues, contact RKI Instruments, Inc. for further instruction.
Slow or No Response/Difficult or Unable to Calibrate
Symptoms
• The detector 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 detector requires frequent calibration.
NOTE: Under “normal” circumstances, the detector requires calibration once every three
months. Some applications may require a more frequent calibration schedule.See
“Calibration Frequency” on page 11 for a discussion of the calibration frequency.