Calibration and Auditing Procedures
Calibration Apparatus
A MiniFlo flow rate transfer standard device is used as the flow rate reference to calibrate the sampler's rotameter-. To be valid, the MiniFlo transfer standard must have been calibrated against a primary standard traceable to the NIST within the last year.

A calibrated digital manometer, Magnehelic® gage, or water manometer is required to measure the pressure drop across the MiniFlo orifice element.

The actual ambient temperature and barometric pressure must also be measured or obtained locally.