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Title: Temperature Compensated Diaphragm Meters
Author: Richard H. Schieber
Source: 1975 Appalachian Gas Measurement Short Course
Year Published: 1975
Abstract: Of the three most common forms of fossil fuels (gas, oil and coal) only gas is elastic in nature and thus must be measured under known temperature and pressure conditions as well as in volumetric units. It is, after all, the heating value or BTU content that is actually being bought and sold and not actual cubic feet when we are dealing with natural gas. And because the BTU content in a volumetric cubic foot is a function of the pressure and temperature of the gas, measurement and/ or control of these variables is important to overall measurement accuracy. Diaphragm type gas meters with internal temperature compensation were first introduced in about 1957. Today the temperature compensating option is one of the most popular features in all types of diaphragm meters, from the domestic to the industrial sizes. This wide acceptance is easily understood when the advantages of temperature compensation are compared to the low initial investment. The following article will explain how temperature compensation is accomplished, its effect on overall measurement accuracy, and how its use is economically justified.

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