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Title: Theory And Operation Of Rotary Meters
Author: Joseph L. Pond
Source: 1970 American School of Gas Measurement Technology
Year Published: 1970
Abstract: The original rotary meters, developed in the 1920s, consisted of two oppositely rotating impellers of two-lobe or figure 8 contour, operating within a rigid casing having inlet and outlet gas connections on opposite sides. Impeller contours were of a form which provided a continuous line seal between the impellers and the body wall at all positions during rotation. The impellers do not push against each other. Clearance between the impellers is maintained by timing gears.

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