SKC 225-317 SKC Diesel Particulate Matter (DPM) FIlter Cassette - Manual (Page 3)

Calibration
Option 1: Using a Calibration Jar (Figure 3)
1. Prepare a DPM Cassett e or cyclone/DPM Cassett e assembly. If using a
cyclone, ensure grit pot remains on cyclone body during calibration.
SKC recommends using the smallest calibration jar possible. To
achieve this, do NOT use Cassette Holder 225-1 during calibration.
2. Place DPM Cassett e or
cyclone/DPM Cassett e
assembly into an airtight
calibration jar that
contains an inlet and
outlet (SKC Cat. No. 225-
111, see Figure 3).
3. Using fl exible tubing,
connect inlet of calibrator
to inlet of calibration jar.
4. Run tubing from outlet of DPM Cassett e or cyclone/DPM Cassett e assembly
through outlet of calibration jar and to the inlet of a sample pump. If using
the SKC 225-111 jar, connect the Luer adapter inside the jar to the cyclone/
cassett e outlet. Connect jar outlet to inlet of a sample pump.
5. Turn on pump and calibrate to desired fl ow rate following directions in the
pump and calibrator operating instructions.
6. Aft er calibration, disassemble calibration jar, remove the DPM Cassett e
or cyclone/DPM Cassett e assembly, and replace DPM 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 DPM
Cassett e or cyclone/DPM 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.
Figure 3. Calibration Train with Jar
Figure 4. Jarless Calibration with DPM Cassette and
AirChek XR5000 Pump