MAINTENANCE FOR AREARAE STEEL
7-9
7.5 PID Sensor Cleaning/Replacement
This section only applies to a monitor that is equipped with the
PID detector option. During the course of normal operation, a
film of gas vapor may build up inside the PID sensor module
and the UV lamp. The rate at which the film develops depends
on the type and concentration of the vapors being sampled. As
a guide, it is recommended to clean the PID sensor module
and lamp only when the PID is malfunctioning. The sensor
module is made of several components and is attached to the
lamp housing unit. If the lamp does not turn on, the monitor
displays an error message of “Lamp” to indicate cleaning or
replacing of the lamp is required. Periodic cleaning of the lamp
window will also remove film deposits and restore lamp
sensitivity. Care must be exercised when cleaning the window
surface so that it will not be damaged.
1. Turn off the AreaRAE Steel. Make sure it has been
disconnected from the battery charger, and then remove
the battery pack.
2. Open the monitor cover, and carefully remove the gas
piping plate from the printed circuit board and sensors.
3. Remove the shielding cap for the PID sensor. Gently pull
out the PID sensor. Note: The sensor is made of Teflon
and stainless steel material.
4. Dip the entire PID sensor into GC-grade methanol. It is
highly recommended that an ultrasound bath to be used to
clean the sensor for at least 3 minutes. Then dry the
sensor thoroughly.
5. If the lamp is operational, use a cotton swab to clean the
flat window surface with GC-grade methanol. If the lamp
does not turn on remove the UV lamp.
6. Install a new lamp, avoiding contact with the flat window
surface.
7. Reinstall the PID sensor. Install the shielding cap.
8. Replace the gas piping plate. Reattach the instrument
housing and reinstall the battery pack.
9. Calibrate the instrument prior to placing it back into service.
