The Measurement of Gas Flow Part I

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Abstract
Often in the performance of their duties, the air pollution control engineers and analysts must accurately monitor known amounts of gas into such devices as ambient air analyzers. These people are finding that even normal fluctuations in ambient temperature and pressure can cause significant deviations in the final results unless they systematically and laboriously reduce all their volumetric flow data to a standard base. Many people are using flowmeters daily as measuring devices to assist them in their air pollution quality assurance duties. It is imperative that they understand what factors influence the reliability of the flow readings they obtain and how to correct their data for these factors. Others are responsible for maintaining the calibration of working ambient analyzers. They must not only understand the operation of the analyzer, but they must also have a working knowledge of the primary and transfer flow standards used to calibrate them. The following survey covers those types of flowmeters most likely encountered when performing quality assurance duties and ambient analyzer calibrations. Each flowmeter will be briefly described by pointing out those factors that are important in obtaining accurate data. A comprehensive list of references is also provided for additional reference.

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