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Ion Science Ltd
FirstCheck+ 1000, 2000, 3000 & 5000
Ion Science Ltd
Maintenance
Blowing out the PID Cell will fix 99% of maintenance problems
When using the PID instrument in conditions of high ambient humidity, the PID may show unexpected
readings appearing to increase. This occurs due to dust or other small particles within the detector
becoming hydrated with humidity. This causes these particles to conduct a signal between the
electrodes. This issue can be resolved by the user in the field using the following procedure and a can
of computer duster air.
First remove the lamp, following the instructions on lamp removal from the cleaning the lamp section
below (steps 1 – 5). Using a can of computer duster, spray air down the small metal tube. Then
liberally inside the detector to remove any lint and dust particles. Replace the lamp and cap and test
the instrument.
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 „Technical Specification‟ for details of parts
expected life time.)
3. Secondary Probe Filter
Designed to strengthen the instrument response, even in condensing environments. If the instrument
background reading is high, change the main probe filter first. If the readings remain high it will be
necessary to change the secondary probe filter as follows;
a) Using an 11mm (7/16") spanner, unscrew the probe fitting from the end of the PID detector
nozzle.
b) Remove and discard the secondary probe filter.
c) Insert a new secondary probe filter into the probe fitting.
d) Screw the probe fitting back onto the nozzle and tighten using an adjustable wrench.
CAUTION: DO NOT OVERTIGHTEN THE PROBE FITTING
Cleaning the FirstCheck+ Lamp
The FirstCheck+ 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 FirstCheck+ is a sensitive detector. Internal components must be handled with clean hands and
clean tools. The FirstCheck+ lamp is fragile. Handle with great care!
1. Ensure that the FirstCheck+ is switched OFF.
2. Remove the probe and filter. Unscrew the black knurled
l
.
ring to expose the detector
amp
Page 36 of 45
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