Airmetrics: MiniVol Calibration and Auditing Procedures




•	Calibration and Auditing Procedures Overview

•	Discussion of Flow Rate Measurement and General Aspects of PM10/PM2.5 Sampler Calibration

•	Sampler Calibration

	•	Calibration Apparatus

	•	Precalibration System Check

	•	Rotameter Calibration

	•	Calibration Calculations

	•	Rotameter Set Point Adjustment Procedure

	•	Sampler Calibration Frequency

•	MiniVol Flow Rate Performance Audit Using a MiniFlo Transfer Standard

	•	Audit Apparatus

	•	Flow Rate Audit Procedures

	•	Audit Data Calculations

Calibration and Auditing Procedures
Rotameter Calibration
Procedures for calibrating the sampler rotameter are as follows:

Install the MiniFlo transfer standard on the inlet tube of the MinVol sampler filter holder.
Turn on the sampler and allow it to warm up to normal operating temperature (at least 2 minutes). The transfer standard must also equilibrate before proceeding with the calibration.
Read and record the following parameters:
- Ambient temperature (Tact), °K
- Barometric pressure (Pact), mm Hg

Adjust the flow control until the rotameter displays 6.5 L/min.
Read and record the following parameters:
- Transfer standard pressure drop
  (H), inches of water
- Sampler rotameter indication (Qind), liters per minute
Repeat steps 4 and 5 for rotameter settings representing flow rates of 6.0, 5.5, 5.0, 4.5, and 4.0 L/min.

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