Rae MiniRAE Plus PGM-76, Operation And Maintenance Manual

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SECTION 8 MAINTENANCE
8 - 10
8.4 Probe Assembly Cleaning
During the course of normal operation, significant amount of
dust and particles can be drawn into the sensor module. A dust
filter (steel wool ) is inserted into the cavity at the base of the
probe assembly to remove these dust and particles.
The rate at which the dust and particles accumulate depends on
the working environment. As a guide, it is recommended to
replace this dust filter once a week.
1. Turn off power to the MiniRAE Plus Professional PID Unit.
2. Remove the probe assembly. Use a small tweezers to
remove the steel wool inside the cavity. Insert a new one
into the cavity. Make sure that it stays snugly fit inside the
cavity.
3. Replace the probe assembly.
4. Turn on the MiniRAE Plus Unit. Wait for the pump to
come on. Check to see if air is drawn into the gas inlet
probe. If the probe is air tight, when the gas inlet is blocked
by a finger, the pump noise should change and a strong
suction force will be felt.