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25
Sensor & Lamp Cleaning/Replacement
Clean the PID sensor module, the lamp and housing only if:
1. The reading is inaccurate even after calibration.
2. The reading is very sensitive to air moisture.
3. A 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 sensor
cover. Then hold the PID sensor and pull it straight out. A slight,
gentle rocking motion helps release the sensor.
25.1 Cleaning The PID Sensor
Place the entire PID Sensor Module into GC-grade methanol. It is
highly recommended that an ultrasound bath to be used to clean the
sensor for at least 15 minutes. Then dry the sensor thoroughly. Never
touch the electrodes of the sensor by hand.
Also use a methanol-soaked cotton swab to wipe off the lamp housing
where it contacts the sensor when the sensor is installed.
Turn over the sensor so that the pins point up and the sensor cavity is
visible. Examine the sensor electrodes for any corrosion, damage, or
bending out of alignment. The metal sensor electrode "fingers"
should be flat and straight. If necessary, carefully bend the sensor
fingers to ensure that they do not touch the Teflon portions and that
they are parallel to each other. Make sure that the nuts on the sensor
pins are snug but not overtight. If the sensor is corroded or otherwise
damaged, it should be replaced.
RAEGuard 2 PID User's Guide
75
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