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Title: Automated Air Flowrate Calibrations At Teie National Institute Of Standards And Technology
Author: William G. Cleveland, Jr. George E. Mattingly
Source: 1992 Measurement Science Conference
Year Published: 1992
Abstract: This paper describes the recently completed automation of air flowrate calibration facilities at the National Institute of Standards and Technology (NIST) in Gaithersburg, MD. This effort encompassed the automation of the flow calibration facilities used for meters flowing air up to approximately 0.05 m3/s using timed collection techniques. The flow-rate of air passing through the meter under test is determined using conservation of mass principles and automated measurements of pressure, temperature, and collection time of a known volume of air. Two types of displacement devices are used: mercurysealed piston provers for lower flowrates and bell gasometers for higher rates. The techniques used for automated calibrations and the menu-driven software are described. The accuracy improvements due to automation justify an overall accuracy quotation for NIST air flowrate measurements in this range at 0.20% or better.

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