52 • VOC Pro Transmitter
13. Press in the electrode stack firmly to ensure that the stack wing clips are engaged and the
faces of the stack and sensor body are flush.
14. Plug the sensor element into the sensor housing board. Ensure that the pins on the sensing
element align with the sockets on the sensor housing board.
15. Screw the sensor housing cap back onto the sensor housing base, ensuring that the sensor
housing cap is only tightened hand tight.
16. Zero and calibrate the detector as described on page 59.
Replacing the PID Electrode Stack
WARNING: Do not remove the sensor housing cap or enclosure lid while the circuits are
energized unless the area is determined to be non-hazardous. Keep the sensor
housing cap and enclosure lid tightly closed during operation.
CAUTION:
The internal components can be static sensitive. Use caution when opening the
enclosure and handling internal components. DO NOT use any metal objects or
tools to remove the sensor.
The electrode stack can last for the life of the PID sensor if the VOC Pro is used in a very
clean, controlled environment. When used in a heavily contaminated or dirty environment, the
electrode stack may only last a month. A contaminated electrode stack will cause a drop in
sensitivity which can cause problems calibrating the PID channel. The electrode stack should
be replaced if the PID sensor shows signs of contamination even after cleaning or replacing
the lamp.