Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1980-08-18
1982-08-31
Howell, Kyle L.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386114, 7386115, 7386102, G01F 158, G01F 164
Patent
active
043466052
ABSTRACT:
A magnetic flowmeter includes first and second tube sections each having ls of non-magnetic material. The first tube is suitably connected to a process for passing a flow of an electrically conductive fluid to be measured. The second tube is established as a reference containing a still medium and is maintained at the same temperature as the first tube. A rotatable magnet assembly is disposed between the two tubes with at least two magnets attached to radially extending arms from a central shaft. Each magnet includes an air gap suitably sized to pass astraddle the diameter along a portion of the length of each of the two tubes. The magnets are provided in matched pairs spaced 180.degree. apart such that signals will be simultaneously generated in signal leads attached to each of the two tubes. By comparing the signals from the two tubes and varying the rotating speed of the magnet assembly until the signals are equal, or attain a maximum, the flow velocity of the fluid within the first tube can be determined. Through temperature monitoring and appropriate heaters, the two tubes are maintained at the same temperature.
REFERENCES:
patent: 2607223 (1952-08-01), Fleming
patent: 2750461 (1956-06-01), Bunch
patent: 3736798 (1973-06-01), Wood et al.
patent: 3824456 (1974-07-01), Wiegand
patent: 3967500 (1976-07-01), Forster
Raue Donald J.
Skladzien Stanley B.
Besha Richard G.
Carlson David V.
Fisher Robert J.
Glenn Hugh W.
Howell Kyle L.
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