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Calibration of Tangential Paddlewheel Insertion Flowmeters
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This paper reports on the efforts to calibrate flow sensors that are being used to monitor building thermal energy use in a large scale monitoring project. Several insertion-type paddlewheel meters are being tested with a dynamic-weight flowloop at varying flow velocities in pipe sizes ranging from 3-12 inches to establish their accuracy and metering characteristics. Preliminary tests indicate that some of the meters do not have the correct multiplying factor and as a result, indicate flow rates that are as much as 15% lower than the actual flow rates. However, when a corrected multiplier is applied the meters perform to within ±5% of the flow rate. Preliminary tests also show that magnetic type paddlewheel meters may not be the best choice for flow rates below 2 ft/s.
Robinson, J.; Bryant, J.; Haberl, J.; Turner, D. (1992). Calibration of Tangential Paddlewheel Insertion Flowmeters. Energy Systems Laboratory (http://esl.eslwin.tamu.edu). Available electronically from