Rae ToxiRAE PGM-30, Руководство по эксплуатации и обслуживанию

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MAINTENANCE
7 - 5
7.2 Sensor Module Cleaning
During the course of normal operation, a film of gas vapor
may build up inside the sensor module and the filter. 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 sensor module and filter
regularly upon returning from fieldwork.
A metallic filter is installed in front of the sensor module to
prevent dust and moisture entering the sensor module. It
also serves as a static shield for the sensor. This filter
needs to be cleaned when it is dirty.
The sensor module is made of several components and is
attached to the lamp-housing unit as shown in Figure 7.1.
Sensor Module/Filter Cleaning Procedure
1. Turn off power of the Pocket PID Unit.
2. Refer to Figure 7.1, unscrew the sensor cap. Remove
the sensor module and filter by grabbing the edge of the
sensor module and gently pulling out the entire
assembly.
3. Refer to Figure 7.1, carefully remove the filter from the
sensor module.
4. Dip the entire sensor module into GC (Gas
Chromatography) grade methanol. It is highly
recommended that an ultrasound bath to be used to
clean the sensor module for at least 3 minutes.