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Title: Self-Checking Electronic Measurement: An Efficient Method To Improve Accuracy
Author: George R. Givens
Source: 1990 International Symposium on Fluid Flow Measurement
Year Published: 1990
Abstract: The current practice to ensure the accuracy of a traditional measurement station is a periodic measurement station test, usually one test every 30 days for a major station. The measurement station test determines if the equipment is within calibration standards. If the equipment is outside standards, it is calibrated to an acceptable accuracy. The results are recorded on the measurement station test report to provide the data for a measurement station test adjustment. The self-checking electronic measurement station, with duplicate sets of transmitters, can increase the monitoring of the custody transfer transmitters performance from once every 30 days to once every 30 seconds. Transmitters performance problems can be identified on a real-time basis with the opportunity to dispatch a measurement specialist to correct the problem within hours instead of the traditional practice of once a month. Improvements in flow computer hardware and solLwdxe, transmitters, on-line chromatographs and real-time energy measurement devices have resulted in the opportunity to design and install self-checking electronic measurement stations. This paper describes CNG Transmission Corporations experiences in testing electronic measurement stations and reviews the design concepts and operating considerations for a custody transfer self-checking electronic measurement station.

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