RKI Instruments 61-0198RK - Manual (Page 14)

10 • 61-1007RK/61-0198RK Carbon Dioxide Detector
Replacing Components of the CO
2
Detector
This section includes a procedure to replace the hydrophobic membrane, a procedure to
replace the plug-in IR CO
2
sensor, and a procedure to replace the entire CO
2
detector
assembly. In most cases, it is not necessary to replace the entire detector assembly.
Replacing the Hydrophobic Membrane
1. Turn off the controller.
2. Turn off or unplug incoming power to the controller.
3. Unscrew the detector housing cap from the detector housing body.
4. Gently pry up the edge of the white hydrophobic membrane with a small flat blade
screwdriver or a similar tool.
5. Peel off the hydrophobic membrane. It may be necessary to clean off the detector
housing cap face to remove any residue left from the adhesive backed membrane.
6. Install the new membrane in the recess on the face of the detector housing cap.
7. Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
8. Turn on the power to the controller.
9. Turn on the controller and place it into normal operation.
Replacing the Plug-In CO
2
Sensor
CAUTION: The plug-in 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 power to the controller.
3. Unscrew the detector housing cap from the detector housing body. Make sure not to
Slow or No
Response/
Difficult or
Unable to
Calibrate • Detector responds
slowly or does not
respond to response
test.
• Unable to accurately
set the zero or
response reading
during calibration.
• Detector requires
frequent calibration.
Note: Under “normal”
circumstances, the
detector requires
calibration once every
six months.
Some applications may
require a more frequent
calibration schedule.
• The calibration cylinder
is low, out-dated, or
defective.
• The regulator flow rate
is not 0.5 LPM.
• The detector is
malfunctioning.
1. Verify that the calibration cylinder
contains an adequate supply of a
fresh test sample.
2. Confirm that the regulator being used
is a 0.5 LPM regulator.
3. If the calibration/response difficulties
continue, replace the detector.
4. If the calibration/response difficulties
continue, contact RKI for further
instruction.
Table 2:Troubleshooting the CO
2
Detector (Continued)
Condition Symptom(s) Probable Causes Recommended Action