How do I get the best from my PID?

Annual Service and Calibration
Each year our manufacturer approved engineers at Shawcity will inspect and test the performance of your PID. Depending on the model, this service may include:

Lamp cleaning, sensor cleaning, lamp performance test, probe replacement, battery operation time test, display test, external water/dust filter replacement, internal inline pump filter replacement, firmware upgrades, PC communication test, calibration against an NPL traceable source, exterior clean and issue of a service report and calibration certificate.

Bump Test / Calibration
As well as returning your PID to Shawcity for an annual calibration and service, we recommend you yourself regularly check the performance. Switch on the PID and apply calibration gas. The PID should read between 90-110ppm with a known volume of 100ppm +/- 5%. Depending on the sensitivity you require your instrument to work at it may require calibration.

Moisture and Cold Temperatures
If the weather is cold, instruments stored overnight in vehicles or underheated buildings will take a little longer to warm up. Moisture may condense inside units, giving erratic, unstable or false zero readings.

To avoid problems switch on the instrument and allow it to run for 10-15 minutes before use. Routinely clean the lamp and probe, replace filters regularly and keep your PID on charge when not in use.

Lamp Cleaning
Routine cleaning of the PID lamp/sensor will ensure stable readings. It will also help ensure that ‘false positive’ readings are avoided when the gas is present.

Replace Filters Routinely
It is not possible to give an accurate recommendation as to the frequency, as type and concentration of compound will affect the performance. However, we recommend you change filters monthly or sooner.

Extension Tubing
If you want to connect extension tubing to a PID only use Teflon tubing. Tygon, rubber and most other types of tubing act like a sponge and absorb most VOCs. Isobutylene, however, is an exception, so you can use Tygon tubing for calibration.


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