ppbRAE 3000 User’s Guide
100
PID Sensor & Lamp Cleaning/Replacement
The sensor module is made of several components and is attached to
the lamp-housing unit as shown below.
Sensor Components
Note: The cleaning procedure is not normally needed. Clean the PID
sensor module, the lamp and the lamp housing only when one of the
following has happened:
1. The reading is inaccurate even after calibration.
2. The reading is very sensitive to air moisture.
3. A chemical liquid has been sucked into the unit and damaged
the unit.
Use of the external filter helps to prevent contamination of the sensor.
To access the sensor components and lamp, gently unscrew the lamp-
housing cap, remove the sensor adapter with the gas inlet probe and
the metal filter all together. Then hold the PID sensor and pull it
straight out. A slight, gentle rocking motion helps release the sensor.
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