SKC 222-Series Low Flow Pump - Manual (Page 7)

5
Determining the Pump Factor
To determine the relation between the counter and the pump volume:
1. Using fl exible tubing, connect the pump inlet to the outlet of a fi lm fl owme-
ter.
2. Turn on the pump.
3. Turn the fl ow adjust dial to set the pump fl ow rate to 100 ml/min.
4. Turn off the pump.
5. Record the counter reading.
6. Turn on the pump and allow the pump to run for one minute.
7. Turn off the pump. Record the counter reading.
8. Subtract the fi rst counter reading from the second reading. This yields the
number of counts per 100 ml.
9. Calculate the pump factor (ml per count) using the following equation:
The pump factor should be checked periodically. SKC recommends
performing this procedure aft er every 40 hours of operation.
Sampling with Bags
The SKC 222 Series Low Flow samplers are also designed for sampling with
bags. It is important that precautions be taken to prevent contamination of the
pump when performing bag sampling.
Before use, allow pump to equilibrate after moving it from one tempera-
ture extreme to another.
Protect sample pump from weather when in use outdoors.
Use of any device other than the approved battery pack to power the
pump voids the UL Listing for intrinsic safety and any warranty.
1. Loosen the set screw on the outlet (exhaust) fi tt ing on top of the pump (see
Figure 1 on page 6).
2. Remove the fi tt ing by unscrewing counterclockwise.
3. Att ach PTFE tubing to the exposed special fi tt ing. Att ach the other end of
the tubing to the inlet valve on the sample bag.
4. See the bag operating instructions for details on the operation of the bag
fi tt ing(s).
When collecting bag samples, the contaminant passes through the
interior of the pump. The pump should be purged after bag sampling
to remove any remaining contaminant. To purge the pump, run it
for several minutes in a clean air environment. If the contaminant is
hazardous, take all necessary safety precautions.
Failure to follow warnings and cautions voids any warranty.
Pump Factor (ml per count) =
100
Number of Counts per 100 ml