Sampling – SKC 225-100 GS-3 Cyclone User Manual
Page 3
5. Turn on pump and calibrate to desired fl ow rate following directions in the
pump and calibrator operating instructions.
Flow rate:
2.75 L/min for a 4.0-μm cut-point*
3.7 L/min for a 3.5-μm cut-point
†
6. Aft er calibration, disassemble calibration jar, remove cyclone/cassett e
assembly, and replace cassett e used for calibration with a fresh (unused)
cassett e to be used for sampling.
Option 2: Jarless Calibration (Figure 4)
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 their own calibration adapters.
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 cassett e in
a cyclone/cassett e assembly 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. Ensure the fl ow rate has been set properly (see Calibration).
Leave grit pot in place during calibration and sampling.
2. Ensure fresh cassett e has been installed on the cyclone and the cyclone/cassett e
assembly has been inserted into the cassett e holder (see holder instructions).
3. Connect the Tygon
®
tubing attached to the cassette holder to the inlet of a
constant fl ow personal sampling pump.
4. Clip the holder with the cyclone/cassett e assembly onto a worker’s collar or
pocket as close to the breathing zone as possible.
5. Clip the pump onto the worker’s belt or place it in a protective pouch. Start the
pump and record pertinent details.
6. At the end of the sampling period, stop the pump and record pertinent details.
Remove the cyclone/cassett e assembly from the cassett e holder. Immediately
separate the cyclone from the cassett e. Replace the inlet section of the cassett e,
seal the inlet and outlet sections with the provided plugs, and send the cassett e
and all data to a laboratory for analysis.
Particles collected in the grit pot do not represent any part of the
respirable dust sample and should be discarded.
* Calibrated at U.K. Health and Safety Laboratories. V
view the collection effi
ciency curve.
† Determined using experimental data obtained at fl ows from 2.0 to 4.0 L/min.
Figure 4. Jarless Calibration with Cyclone/Cassette
Assembly and AirChek XR5000 Pump