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Fir 1, 2, 3 & 5000
Ion Science Lt d
Ion Science L td
Page 42 of 53
Maintenance
______
1. Keep the PID detector lamp window clean.
2. Replace the sample filters on a regular basis.
Frequency of cleaning the detector lamp and replacement of the filter depends on the type of gas
being detected and the quality of the background air (see page 49 for details of parts expected life
time.)
Cleaning the Fir Lamp
The Fir PID relies on an ultraviolet light source ionising VOC gases as they pass across the lamp
window. This process may result in a very fine layer of contamination appearing on the detector window that
must be removed on a regular basis.
CAUTION!
The Fir is a sensitive detector. Internal components must be handled with clean hands and
clean tools. The Fir lamp is fragile. Handle with great care!
1. Ensure that the Fir is switched OFF.
2. Remove the probe and filter.
3. Unscrew the black knurled ring to expose the detector
lamp
.
4. Push a lamp-removing sleeve over the end of the lamp.
This allows the user to grip the glass.
5. Extract the lamp from its socket by pulling it in a straight
Away from the PID cell. Force is only required when
Pulling the lamp past the O ring. Once past the O ring
The lamp will move freely.
WARNING!
NEVER REFIT A DAMAGED LAMP!
Passed the
O-ring
Move freely in
a straight line