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Title: Meter Calibration In A Horizontal Laminar Flow Environment
Author: Ernest L. Greenhill
Source: American Gas Association 1972
Year Published: 1972
Abstract: Proving rooms in relation to meter proof accuracy have been under study for many years. We, at Sprague, believed that any significant improvement in proving room quality would necessitate a completely new operational concept or an entirely new technology, not only in environmental control but also in the calibrating system itself. With this thought a program was outlined for investigation of the various factors. Simply stated, we wanted a means for bringing the meters, proving bells and test air to precisely the same temperature at a predetermined known temperature level. We began our investigation by visiting metrology laboratories, clean room facilities, and by evaluating accurate temperature measurement and control systems.

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