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Title: Experiences Of Pulp Flow Measurements With Electromagnetic Flowmeters
Author: Esa Luntta, Harri Nystedt, Jouko Halttunen, Juha Kortelainen
Source: Flomeko 2003
Year Published: 2003
Abstract: Electromagnetic flowmeters are today practically the only meter type used in the measurement of pulp flows in paper mills. Usually, these meters have the required accuracy (or at least they are believed to have), the price of them is reasonable, and they are almost maintenance-free. However, electromagnetic flowmeters are usually calibrated in water flow and the effect of the change of the flowing medium to pulp on the accuracy has been investigated rather little 1, 2, 3. The possible error sources in pulp flow measurements can be for example non-uniformity of conductivity or air content of pulp suspension. Incomplete mixing of dilution water may also affect the measurement accuracy. Moreover, the position of the flowmeter has to be selected often after the process plant has been built up. Therefore, the disturbance -free pipe lengths upstream and downstream of the meters can be too short. This paper presents the results of the experiments carried out with five electromagnetic flowmeters of different manufacturers with different water and pulp flows.

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