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Title: Fundamentals Of Positive Displacement Diaphragm Meters
Author: Charles Guzowski
Source: 1992 American School of Gas Measurement Technology
Year Published: 1992
Abstract: Since the early 1800s when the need arose for an accurate method of gas measurement the positive displacement diaphragm meter has been the industrys choice for volumes up to 10,000 CFH, The basic advantage of diaphragm meters in comparison to various types of meters is their capability to accurately measure flow rates varying from small pilot loads to the maximum rated meter capacity. The term rangeability defines the ratio of the maximum meter capacity to a minimum flow rate within a + 1% accuracy band at a constant net pressure. The rangeability of other types of metering devices does not even approach the performance curve of a diaphragm meter.

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