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Title: Bellows-Type Orifice Meters
Author: A. I. Thompson
Source: 1956 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1956
Abstract: The function of an orifice meter is to produce a precise record, on either a square root or uniform chart, of the differential pressure created across the calibrated orifice plate in the flow line. The essential difference between orifice meters is in the type of differential pressure unit or meter body used. Currently there are two basic types available-one using the conventional mercury manometer and the other using the bellows unit. Although single bellows and diaphragm units have been used, when one currently speaks of a bellows type orifice meter, he is by convention referring to the contemporary rupture-proof dual bellows type pressure recorder. Briefly, it consists of a bellows unit assembly and two housings or heads fastened together, A cross-section of one of these units is illustrated in Figure 1.

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