6
De-activating the Regulator
To ensure the pump is set for high
fl
ow,
remove the cap screw (Figure 1, #18)
covering the regulator valve and turn the
exposed screw clockwise until it stops.
(Do not overtighten.)
Replace the cap screw. The pump is
now set for high
fl
ow.
Setting or Verifying Flow Rate
Before use, allow pump to equilibrate after moving it from one temperature
extreme to another.
Ensure pump has run for
fi
ve minutes before pro-
ceeding with calibration.
Using 1/4-inch Tygon
®
tubing, connect the sam-
pling medium to the pump
intake (Figure 1, #13).
Remove the tamper-resis-
tant cover. Start the pump
using the On/Off switch
(Figure 1, #8). Press Start/Hold
(Figure 1, #3). Press Flow and Battery Check (Figure 1, #2). Ad-
just the
fl
ow using the
fl
ow adjustment screw (Figure 1, #11) until
the built-in rotameter reads 2 L/min. The LCD should indicate
BATT OK in the upper left corner (if it doesn’t, recharge the bat-
tery). Press Flow and Battery Check to place the pump in Hold.
Connect a calibrator to the intake of the sampling medium.
Press Flow and Battery Check to start the pump, and set the
fl
ow
rate using the
fl
ow adjustment control (Figure 1, #11).
When the
fl
ow rate is set, press Flow and Battery Check to place
the pump in Hold. Disconnect the calibrator.
Replace the sampling medium used for calibration with an
unexposed medium for sample collection.
Calibration train with
fi
lter cassette
2
3
Flow
adjustment
control
On/Off
switch
Tubing
Calibrator
Sample
media
For high
fl
ow,
turn valve screw clockwise.
