AirLink 6940XP Operator’s Manual
Maintenance
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8. Carefully lift the PID sensor body away from the electrode stack and lamp. Take care not to
touch the lamp window, the flat end of the lamp, with your fingers. If the lamp remains lodged
in the sensor body, carefully remove it with tweezers.
Figure 8: Lamp Window Location
9. If the spring in the lamp cavity comes out, place it back into the lamp cavity.
10. Hold the lamp in one hand being careful not to touch the lamp window with your fingers.
11. With the other hand collect a small amount of aluminum oxide powder on a cotton swab.
12. Use this cotton swab to polish the PID lamp window. Use a circular motion, applying light
pressure to clean the lamp window. Do not touch the lamp window with your fingers.
Figure 9: Polishing the Electrode Lamp Window
13. Continue polishing until you can hear a squeaking sound made by the cotton swab moving
over the window surface. This usually occurs after about 15 seconds of polishing.
14. Remove the residual powder from the lamp window with a clean cotton swab. Take care not to
touch the tip of the cotton swab that is used to clean the lamp as this may contaminate it with
finger oil.
15. Ensure the lamp is completely dry and any visible signs of contamination are removed before
reinstalling.
Lamp Window
