SKC 210-1000 Pocket Pump - Manual (Page 23)

21
Calibrating and Sampling in Constant Pressure Mode
— Multiple Tubes
For use with multi-port adjustable low fl ow tube holders only.
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 to enhanced display and Constant Flow mode (see pages 12 and
13). Remain in these modes until ready to calibrate.
3. Connect the pump to an Adjustable Low Flow Tube Holder (see Optional Ac-
cessories, page 27). Use a screwdriver to turn all the fl ow adjust screws counter-
clockwise until they are fl ush with the tube holder surface.
4. Label all tubes and ports (e.g., tube #1, port A).
5. Insert
the fi rst opened representative tube (#1) into the fi rst port (“A”), etc. Place
unopened tubes in any unused ports to “seal” them. This is essential to obtain
correct results.
6. Set the desired fl ow rate to a primary standard calibrator (see pages 15 and 16,
Steps 5 through 11) as specifi ed by the method for tube #1 in port A. Record the
fl ow rate. See cautions below.
7. While the pump is in RUN, press the  button to scroll to Constant Pressure
reading (ins or mm). Record the back pressure for that tube. Press [] to place
the pump in HOLD.
8. Repeat Steps 5 through 7 for each port to obtain the back pressure for each
representative
tube.
All empty ports must contain unopened tubes during calibration and sampling.
When performing multiple-tube sampling in Constant Pressure mode, the fl ow
rate must be set as low as possible. The sum of the fl ow rates cannot exceed
100 ml/min for back pressures from 10 to 20 inches of water; the sum of the
fl ow rates cannot exceed 200 ml/min for calculated back pressures less than
10 inches of water.
Advanced Operation