Form 37714 Rev 1809
Page 7 of 13
Flow Rate Through Sorbent Tubes
1. A
tt
ach the tubing on the CPC outlet (side of the CPC without a label) to the pump inlet. A
tt
ach
the Adjustable Low Flow Holder to the CPC inlet (marked “To Sample”).
See Figure 4.
2. Break tips o
ff
the representative sorbent tubes and insert the tubes into the rubber sleeves on
the holder
(arrow on each tube pointing toward pump)
. Place unopened tubes in any unused
ports to “seal” them.
3. Label all representative tubes and ports.
4. Using
fl
exible tubing, connect the exposed end of the
fi
rst active tube to be calibrated to the
calibrator outlet (suction port).
5. Using a small screwdriver, loosen and turn the brass flow adjust screw (
see above right
)
directly beneath the port holding the
fi
rst active tube to be calibrated (
clockwise
to increase,
counterclockwise
to decrease) until the calibrator indicates the method-speci
fi
ed
fl
ow rate.
Do
not adjust the
fl
ow rate on the pump.
Note:
For tri and quad models,
fi
rst rotate each anti-tamper
cover to expose the
fl
ow adjust screws, then adjust the appropriate one until the calibrator indicates the
desired
fl
ow (Figures 3 and 5).
6. Repeat Steps 4 and 5 for each active representative tube.
Note:
Changing the
fl
ow on one tube will
not
a
ff
ect the
fl
ow rate through the remaining tubes.
7. Once
fl
ow is calibrated for each active tube, it is recommended practice to re-check the
fl
ow rate
through representative tubes before removing them. Any adjustment should be minimal.
Screw
Screw
Figure 5.
Cut-away of Tri/Quad
Adjustable Low Flow Tube Holder
Turn screw on
tube holder to
adjust
fl
ow.
Flow adjust screws
Connect
CPC to
pump inlet,
tube holder
to CPC, and
tube inlet to
calibrator.
Figure 4.
Calibration Train with Quad Adjustable
Low Flow Tube Holder
Suction port
chek-mate Calibrator
Quad tube holder
Tube holder outlet
Pump
inlet
CPC inlet (marked
“To Sample”)
