MAINTENANCE
7 - 7
7.3 Sampling
Pump
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 or rebuild the pump.
To check the pump flow, remove the tube holder and insert a
piece of 3/16” (4 mm) glass or metal tubing into the rubber tube
connector in the sensor module (see
Figure 7-4
). The flow
should be above 350 cc/min. The flow with a RAE-SEP
benzene tube in the normal configuration should be greater than
200 cc/min.
Figure 7-4 Sampling Pump
Battery Cover
Bottom Cover
Top Cover
Lamp Housing
Pump
