P 1, 2, 3 & 5000 Ex Ion Science Ltd
Page 45 of 52
Maintenance
5
Remove the residual powder with a clean cotton bud. Care must be taken not to touch the tips of
cotton buds that are to be used to clean the lamps as this may contaminate them with finger oil.
6. Ensure the lamp is completely dry and any visible signs of contamination are removed before refitting.
7.
The instrument MUST now be re-calibrated.
Blowing out the PID Cell
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
above (steps 1 – 5). Using a can of computer duster, spray air down the small metal tube. Replace the
lamp and cap and test the instrument.