7
Setting or Verifying the Flow Rate
For High Flow Sampling (1000 to 3000 ml/min)
Using
1/4
-inch ID tubing, connect a representative sampling medium
to the pump inlet (Figure 1, #4). Connect an external flowmeter to
the inlet of the sampling medium.
Turn on the pump using the on/off button (Figure 1, #8). To adjust
the flow, turn the flow adjustment screw (Figure 1, #6) clockwise to
increase the flow or counterclockwise to decrease the flow until the
desired flow rate is indicated on the flowmeter. When the desired
flow is obtained, take three readings to confirm that the flow rate
is consistent. Calculate and record the flow rate as the average of
three readings.
Disconnect the flowmeter and replace the representative sampling
medium with a new unexposed medium for sample collection.
Tygon Tubing
Filter Cassette
Calibrator
Inlet
Sample Pump
Calibration train with filter cassette
2
continued on page 8
