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Title: High Frequency Tangent Sensor Improves Meter Testing
Author: Walter F. Dydak
Source: American Gas Association 1978
Year Published: 1978
Abstract: Traditionally gas meters have been proved by visual observation of the number of revolutions of the tangent arm that is directly coupled to the volumetric chambers of the meter. Further developments led to semiautomated proving which detected the revolutions of the tangent arm by micro-switch or photo-electric eye. The development of the open top tin meter and the aluminum meter required the use of vacuum proving to utilize Ihe tangent for determining the revolutions of the meter. When open top meters were proved on positive pressure it was necessary to use the index to determine the revolutions of the meter. There were inherent errors in the use of vacuum proving and the use of the index required longer proving runs. This led Philadelphia Gas to the development of the high frequency sensor probe that detects the movement of the tangent arm to determine the revolutions of the meter. This device now permits positive pressure proving and allows for shorter proving runs, thus reducing proving time and costs.

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