MAINTENANCE
6-6
6.3 PID Sensor Cleaning
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 as shown in Figure 6-2.
If the lamp does not turn on, the monitor will display 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-Gamma, make sure it has been
disconnected from the battery charger, and then remove
the battery pack.
2. Refer to Figure 6-1; open the monitor cover by unscrewing
the four allen screws that holds the front and back housing
together.
3. Refer to Figures 6-2 and 6-3; carefully unscrew the three
crews that hold down the gas plate to the analog PCB and
sensors. Remove the gas plate.
4. 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.
