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Title: On-Site Calibration Of Liquid Flow Meters Using The Radiotracer Transit Time Method
Author: Risto Kuoppamaki, Heikki Turtiainen
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: Flow meters belong to the category of instruments which are especially sensitive to the measurement environment. Hence the most reliable way to assure reasonable accuracy is to calibrate the flow meter on site, under the actual measurement conditions. The radiotracer transit time method has now been developed into a highly practical on-site calibration method by the introduction of the 137-Cs/137m-Ba radioisotope generator to supply the very short-lived (2.6 min) 137m-Ba radiotracer and a microprocessor unit carrying out the measurement digitally and computing the flow rate immediately. The whole set of equipment is easily portable. To reach a high accuracy level in industrial pipelines with complicated structures, practical instructions for detector location were developed to eliminate profile effects caused by bends, valves, etc. By using these and totally digital transit time computing, an overall accuracy level of +/- 1...2 per cent is achieved even in pipelines containing a straight section of no more than 20 pipe diameters.

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