MAINTENANCE
7-5
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 straight out to avoid bending the
electrical pins on the sensor (see Figure 7-2). A slight,
gentle rocking motion helps release the sensor.
To clean 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.
To clean lamp housing or change the lamp:
If the lamp does not turn on, the monitor will display an
error message (Lamp) to indicate replacement of the lamp
may be required.
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