SKC 225-380 Parallel Particle Impactor - Manual (Page 5)

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3. Calibrate the sample pump to the specifi ed fl ow
rate. See sample pump and calibrator operating
instructions.
4. Disconnect tubing and remove calibration jar and calibrator when
calibration is completed.
Option 2: Jarless Calibration
This calibration option is recommended when using a Defender primary standard
calibrator to calibrate personal air sample pumps for size-selective particulate sampling
using particulate samplers that do not have a calibration adapter.
1. Use a length of fl exible tubing to att ach the inlet of
the sample pump to the suction port of a Defender
calibrator.
2. Use the shortest length of tubing possible to att ach
the outlet of the PPI sampler to the pressure port of
the Defender.
3. Set the Defender to take at least 20 fl ow measurements in order to average
out the fl ow variations caused by direct connection of the pump to the
calibrator. See calibrator operating instructions for details.
Sampling
1. If required, replace representative sample media used for calibration with
new, pre-weighed media (see Media Preparation).
2. Record sample start time on label.
3. Clip PPI onto a worker’s collar or lapel in the breathing zone or in the area to
be sampled.
4. Clip sample pump at the worker’s waist or close to the PPI.
5. Use fl exible tubing to att ach the PPI outlet to the inlet of the sample pump.
6. Turn on pump and record pertinent sample data.
7. Aft er the desired sample time has elapsed, turn off the pump and record
sample stop time.
8. Reinstate calibration train and verify fl ow rate (see Calibration).
9. Remove pump and tubing from the impactor.