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Title: Measurement By Displacement
Author: Richard H. Schieber
Source: 1970 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1970
Abstract: The Displacement Gas Meter is frequently referred to as a Positive Displacement Meter, not because measurement with this device is any more definite or accurate than the measurement which might be obtained with another typo meter, but because the measurement that it affords is a positive volumetric quantity in cubic feet at flowing conditions - regardless of the temperature, gravity or pressure of the flowing gas. There are three basic types of gas meters which are generally considered as falling into this category: 1-wet (rotating drum) meters 2-rotary (impeller type) meters and, 3-slide-valve dry type meters.