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Title: Tandem Rotaey Meter Transfer Standard
Author: Zane A. Wade
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: This paper describes the application of an interlaboratory calibration technique to the development and testing of a highly accurate and repeatable transfer test standard for domestic gas meter calibration systems. The development of a highly accurate volume standard was culminated in 1981 with the introduction of the Laboratory Piston Prover.(l) This device is comprised of a ball screw driven piston riding in a 300 mm (12 inch) diameter cylinder honed to a tolerance of .0125mm (.0005 inch) on the diameter. A unique oil seal allows the piston to move in the cylinder without contact between them. The volume inside the cylinder is calibrated using a microwave resonant cavity technique.(2) With this procedure, microwaves are injected into the volume via an internal antenna. At certain frequencies a standing wave pattern can be established and these frequencies are a function of the geometry of the cylinder. Under these conditions, the volume can be determined to within 100 ppm (.01%) absolute. Allowing for the uncertainties associated with various transducers, the overall system uncertainty has been established at 0.05% absolute (95% confidence).

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