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Title: Electronic Vs. Mechanical Corkecttng Devices
Author: Edward L. Deters
Source: 1991 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1991
Abstract: Correcting devices, used with positive displacement and turbine meters, correct the gas volume measured at meter conditions of pressiire and temperature to the standard volume measured at base conditions of pressure and tenperature. Both mechanical and electronic correctors can accomplish this inportant function with the high degree of accuracy required to produce billable volumes at the sale or purchase point of natural gas. Since the early days of gas neasurement, chart recorders have been used to keep track of the pressure and temperature of the metered volume. They nojnt on the meter and are driven from the index or output wriggler. The charts are processed to determine the correcticn factors necessary to produce standard cubic feet values for billing. Ifechanical correctors were developed in the late 1930s to provide a readout of volume in standard cubic feet at the meter site. This eliminated the need to collect the chart, install a new one and process the chart for billing purposes. A mechanical corrector provides the base volume right on the spot, and can be read just like a residential meter. The corrector mounts directly on the meter using the meters output wriggler to provide the uncorrected volume input as well as provide power to run the correcting mechanisms.

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