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Title: Testing The Orifice Meter Gauge
Author: V. J. Schulte
Source: 1975 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1975
Abstract: An orifice meter is normally considered to be a complete measuring unit, the combination of a primary and secondary device. The primary device consists of a meter tube, straightening vanes, plate holder, and a thin sharp-edged orifice plate. The orifice plate is, in effect, a calibrated restriction which causes a pressure drop in the flow of gas. The secondary device records this pressure drop, and also, the static pressure which, when certain factors are applied, can be used to calculate volume. This secondary device consists of a flow meter or orifice meter gauge, gauge piping, and manifold. This orifice meter gauge, either a mercury type or a bellows type, is so constructed that it may be calibrated to achieve a high degree of accuracy. The folowing discussion will cover testing of the secondary device. Hereafter, for simplicity, the orifice meter gauge will be referred to as a meter.

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