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Title: Fundamentals Of Vane Type Rotary Displacement Meters
Author: Richard 0. Lee
Source: 1973 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1973
Abstract: Rotary type gas meters have been In use since the early 1920s In the United States. Earlier versions of the two lobe Impeller design were used In Europe in the late 1800s. Rotary meters fall into two basic classifications. One Is the design utilizing two oppositely rotating Impellers of a dual lobe - figure 8 contour. The other design employs rotating vanes and gate. The contours of the dual lobe Impeller design form a continuous line seal between the impellers and the meter body wall at all positions during rotation. Clearance between the impellers Is maintained by very precise timing gears. Since the Impellers will trap a known volume of gas between themselves and the meter housing, revolutions of the impellers can be transmitted via gearing to an output shaft for Indication of volume displacement on a standard Index or pressure and/or temperature correcting devices.

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