SKC 210-1000 Pocket Pump - Manual (Page 19)

17
Operation
Calibrating and Sampling in Constant Flow Mode —
Multiple Tubes
For use with constant pressure controller and multi-port
adjustable low fl ow tube holders
The Constant Pressure Controller (CPC) (Cat. No. 224-26CPC-10) is a pump accessory
that provides a simple alternative for multiple sorbent tube sampling while in Constant
Flow mode. In conjunction with an Adjustable Low Flow Tube Holder (Cat. No. 224-
26-02, 224-26-03, or 224-26-04), the CPC is used as a pressure regulator to maintain
a constant 10 inches water back pressure. For multiple-tube applications without a
CPC, see Advanced Operation on page 21.
Calibration
Before use, allow the pump to equilibrate after moving it from one temperature
extreme to another.
1. Ensure the pump has run for fi ve minutes before proceeding with calibration.
2. Set the pump for Constant Flow mode (see pages 12 and 13) and set it to the
selected fl ow rate (see pages 15 and 16, Steps 5 through 12). Pump fl ow rate must
be set at ≥ 15% higher than the sum of the fl ow rates through all tubes.
3. Connect the pump inlet to the CPC outlet (the side of the CPC without a label)
with a 1/2 to 1-inch length of Tygon ® tubing.
4. Connect the inlet side of the CPC (marked “to sample”) to the Adjustable Low
Flow Holder.
When multi-tube sampling with a CPC, the fl ow rate of the pump must be
set at ≥ 15% higher than the sum of the fl ow rates through all tubes.
When sampling with the CPC accessory, the volume displayed on the pump
is no longer representative of the volume of fl ow through the tubes due to
the air bypass function of the CPC.
Note:
Note: