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Title: Measurement By Orifice Fundamental Principles Of Orifice Meters
Author: A. m. Beavens
Source: 1968 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1968
Abstract: An orifice meter is a combination of a primary and secondary measuring device for the purpose of determining flow rate through a closed channel. The primary device takes the form of a nozzle, venturi or thin sharp edged orifice to provied a restriction to fluid flow and to produce a pressure drop which is related to this fluid flow. The secondary device is a device to convert this differential pressure information into a usable flow indication, transmission, recording or control signal. In order to use an of these devices for measurement, it is necessary to empirically calibrate them. That is, to pass a known volume through the meter and note the reading in order to provide a standard for measuring other quantities. Due to the ease of duplicating and the simple construction, the thin sharp edged orifice has been adopted as a standard and extensive calibration work has been done so that it is widely accepted as a standard means of measuring fluids.

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