MAINTENANCE
6-9
6.5 Sampling Pump Replacement
The sampling pump is positive displacement piston pump.
When approaching the end of the specified lifetime of the
pump, it will consume higher amount of energy and reduce its
sample draw capability significantly. When this occurs, it is
necessary to replace the pump.
1. Turn off the AreaRAE-Gamma, and remove the battery
pack.
2. Refer to Figures 6-1, 6-2 and 6-3. Remove the four Allen
screws holding the instrument housing together, then
carefully unscrew three screws that hold down the gas
plate to the analog PCB and sensors. Remove the gas
plate.
3. Carefully loosen the connector. Remove the two screws
that hold the pump assembly to the gas plate. Unscrew the
two screws that holding the pump to the PCB. Disconnect
the Tygon tubing that connects the pump to the gas inlet
port.
4. Replace with a new pump assembly. Connect the Tygon
tubing to the gas inlet port. Reattach the pump and screw
down the pump assembly to the analog PCB.
5. Replace the gas plate and tighten the three screws to hold
down the sensors.
6. Reattach the allen screws holding the instrument housing
together, and reinstall the battery pack.
Dust Filter
The dust filter’s function is to reduce the level of dust and
moisture entering the sensors and the pump. By replacing the
dust filter routinely, it can reduce cost of maintenance on the
pump or replacement of the sensors.
The dust filter should be changed when build-up of water
droplets or dust is observed. To change the dust filters, pull
apart the lock connections and replace the dust filter.
