OPERATION
2-18
2.7 Integrated Sampling Pump
The MiniRAE 2000 portable VOC monitor includes an
integrated sampling pump. This is a diaphragm type pump
that provides a 500-600 cc per minute flow rate.
Connecting a Teflon or metal tubing with 1/8 inch inside
diameter to the gas inlet port of the MiniRAE 2000, this
pump can pull in air samples from 200 feet away
horizontally, or 90 feet vertically, at about 3 feet per
second flow speed.
The pump turns on when a measurement is started, and
turns off when the sample is manually stopped in Survey
mode or when the unit is turned off from Hygiene Mode.
If liquid or other objects are pulled into the inlet port filter,
the monitor will detect the obstruction and shut down the
pump immediately. The alarm will be activated and a
flashing error message “Pump” will be also displayed on
the LCD display.
The user should acknowledge the pump shut off condition
by clearing the obstruction and pressing the [Y/+] key to
re-start the pump.
The pump stall threshold is set in the special Diagnostic
Mode (Section 8).
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