RKI Instruments 65-2497RK - Manual (Page 13)

65-2494RK/65-2497RK Oxygen Detector • 9
Replacing Components of the Oxygen Detector
This section includes a procedure to replace the plug-in oxygen sensor, one to replace the
hydrophobic membrane, and one to replace the entire oxygen detector assembly. In most
cases, it is not necessary to replace the entire detector assembly.
Replacing the Plug-in Oxygen Sensor
CAUTION: The plug-in sensor contains electrolyte which is an irritant. 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.
4. Unplug and remove the old oxygen sensor.
5. Carefully plug the replacement sensor into the sockets located in the detector housing
body.
6. Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
7. Turn on power to the controller.
8. Turn on the controller and place into normal operation.
CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the
next step.
9. Calibrate the detector as described in “Calibration” on page 11.
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.