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Title: Rotary Displacement Meters
Author: Bernt G. Iversen
Source: 1956 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1956
Abstract: The Roots-Connersville rotary positive displacement meter accurately measures volumes of gas by the rotation of two figure eight shaped impellers within stationary cylinders. The displacement is accomplished within the confined space which is formed by the cylinder wall, one impeller, and flat surfaced headplates at the ends. Refer to Figure 1 for a cross-sectional view of the meter. This figure shows the direction of the gas flow through the meter. As the right hand impeller rotates in a clockwise direction to a vertical position, a definite volume of gas is displaced. The continued rotation of the impeller releases this measured volume of gas to the bottom opening of the meter. The impeller on the left hand side of the meter rotates in a counterclockwise direction. When this impeller rotates to a vertical position, another definite volume of gas is displaced and discharged through the bottom opening of the meter. This operation is alternately repeated therefore, for one revolution there are four displacements from the measuring compartments. The speed at which the impellers rotate is proportionate to the gas flow. Meters operating at continuous rated capacity have a differential pressure drop nf approximately 1.0 water column.

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