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| Study of No-liquid Calibration Technique for the Medium-and-large Diameter Electromagnetic Flowmeter |
| TANG Si-meng1, HU Liang2, MA Jun1 |
1.Ningbo Institute of Measurement and Testing,Ningbo, Zhejiang 315103,China;
2. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, Zhejiang 310027, China |
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Abstract A no-liquid calibration technique for electromagnetic flowmeter (EMF) is presented. The proposed method utilizes the electromagnetic measuring principle. Several differential equations for the relevant physical quantities and corresponding boundary conditions are established. A set of no-liquid calibration equipment is designed and implemented. By measuring the point-by-point magnetic induction on the boundary surface as well as the structure dimensions of EMF, the sensitivity of EMF are acquired via the numerical solution of the differential equations with measured boundary conditions. The comparison of the no-liquid and practical-flow calibration methods is carried out on two EMFs with diameter of 200mm. The relative error of the sensitivity data determined by the two methods is less than 0.5%.
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2013, Vol. 34 
