MAINTENANCE FOR AREARAE
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, and remove the battery pack.
2. Refer to Figures 6-1, 6-2 and 6-3. Remove the four hex
screws holding the instrument housing together.
3. Carefully unscrew the three screws that hold down the gas
plate to the analog PCB and sensors.
4. Remove the gas plate.
5. Carefully loosen the connector.
6. Remove the two screws that hold the pump assembly to
the gas plate.
7. Unscrew the two screws that holding the pump to the PCB.
8. Disconnect the Tygon tubing that connects the pump to the
gas inlet port.
9. Replace with a new pump assembly.
10. Connect the Tygon tubing to the gas inlet port.
11. Reattach the pump and screw down the pump assembly to
the analog PCB.
12. Replace the gas plate and tighten the three screws to hold
down the sensors.
13. Reattach the hex screws holding the instrument housing
together.
14. 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.
