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Title: Mechanical Vs. Electrical Correction Devices
Author: Charles Guzowski
Source: 1992 American School of Gas Measurement Technology
Year Published: 1992
Abstract: Metering devices such as displacement meters and inferential meters measure gas at line conditions. Since gas is a compressible fluid it responds to changes in pressure and temperature. The gas meter then should be capable of accounting for these varying line conditions. Since the 1930s meters have been mounted with mechanical instruments which correct for metered gas volume with varying line conditions. A change in line conditions, be it pressure or temperature, change the position of linkages within the instrument. The linkage changes give the instrument the capability to vary the speed of the correct volume counter to a given base standard volume. The most common base standard for a cubic foot is considered to be a measured volume at a temperature of 60F and a pressure of 14.73 psia. Mechanical instruments have been, for many years, meeting the gas industries need for metered volume correction although, in the 1970s the advancements in microprocessor technology gave way to the design of electronic base volume computers. The electronic correctors have the capability to compensate for pressure and temperature changes but also have additional capabilities not found with mechanical devices.

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