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Title: Large Capacity Displacement Meters
Author: Wayland Sligh
Source: 1983 International School of Hydrocarbon Measurement
Year Published: 1983
Abstract: A Positive Displacement Meter is one in which a known volume of gas is alternately trapped and released, and the number of cycles recorded. Another term for trapping may be sealing. This principle is applied on both diaphragm type and rotary type meters. Although the operational principle is different, the fact remains that both types measure by means of sealing off a known quanitity of gas, and subsequently releasing it. The bulk of the meters in use today are of the positive displacement type. Other measurement principles are applied in the case of the Turbo Meter, Orifice Meter or Swirl Meter.

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