SKC 224-52 AirChek 52 - Manual (Page 12)

10
Setting or Verifying Flow Rate - Low Flow
Ensure pump has run for fi ve minutes before calibrating. Set the
pump fl ow rate at approximately 1.5 L/min (see Setting or Verifying
Flow Rate for High Flow Applications on page 7).
Connect a constant pressure controller (CPC) (Figure 2, #3) to the
pump intake (Figure 2, #1) using 1/4-inch Tygon tubing.
Using 1/4-inch tubing, connect the intake of the CPC to the outlet
of a single adjustable low fl ow holder (Figure 2, #4).
Insert an opened sorbent tube into the
holder’s rubber sleeve with the arrow on
the tube pointing toward the holder.
Connect a calibrator to the exposed end
of the sorbent tube.
Loosen the brass fl ow adjust screw on the low fl ow holder. Activate
the pump by pressing the on/off button (Figure 1, #3).
Adjust the fl ow rate by turning the fl ow
adjust screw (Figure 2, #6) on the adjustable
low fl ow holder until the calibrator indicates
the desired fl ow.
Do not adjust the fl ow on the pump.
Adjust the fl ow only by using the fl ow
adjust screw on the low fl ow holder.
Figure 2
Single Adjustable Low Flow Holder attached to AirChek 52
1 Pump intake
2 Tygon tubing
3 Constant Pressure
Controller (CPC)
4 Single adjustable low
fl ow holder
5 Protective cover for sample
tube
6 Flow adjust screw
(needle valve)
7 Collar clip
Calibration train with
tube in low fl ow holder
Flow adjust
screw
Turn screw to
adjust fl ow.
continued on page 11
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