Place a filter into the MiniVol sampler filter holder and attach the filter holder assembly to the sampler. (Filters used for flow rate calibrations should not be used for subsequent sampling.)

Turn on the sampler and allow it to warm up to full operating temperature (at least 2 minutes).

While the sampler is running, depress and hold the reset button. (This allows the sampler to continue to run without tripping the low flow shut-off circuit.) Close off the inlet using the palm of your hand. Observe the rotameter, if there are no leaks the rotameter should drop to zero and remain there.

Verify that the transfer standard calibration equation is current and traceable to an acceptable primary standard.

Adjust manometer or Magnehelic® gage to read zero, and connect to the pressure tap on MiniFlo transfer standard. Note: Magnehelic® gage is sensitive to the position it is in when zeroed (vertical or horizontal). Maintain this position when taking readings.