Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...
Patent
1986-11-12
1988-10-18
Levy, Stewart J.
Measuring and testing
Volume or rate of flow
Mass flow by imparting angular or transverse momentum to the...
G01F 184
Patent
active
047778334
ABSTRACT:
A coriolis mass flow meter which includes a ferromagnetic drive mechanism and ferromagnetic velocity sensors is disclosed. The drive mechanism includes a drive coil; a ferromagnetic drive keeper affixed to a flow conduit of the meter so that the keeper it is partially disposed in the field from the drive coil; a magnet for orienting the ferromagnetic domains of the drive keeper; and means for applying a drive signal to the drive coil. The velocity sensor includes a sensor coil; a ferromagnetic sensor keeper affixed to the flow conduit so that the keeper it is partially disposed in the field drawn across the sensor coil; a magnet for orienting the ferromagnetic domains of the sensor keeper, disposed so that a portion of its magnetic field passes through the sensor coil; and means for detecting a current induced in the sensor coil by changes in the sensor keeper position. The drive mechanism oscillates the flow conduit in response to the variable magnetic field produced by the drive signal. As a side leg of the flow conduit oscillates in response to the drive mechanism and Coriolis forces, so too does the ferromagnetic sensor keeper. As a result, the magnetic field passing through the sensor coil varies and a signal is induced therein which provides a measure of the velocity of the side leg of the flow conduit.
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Patent Abstracts of Japan, vol. 7 No. 231, 13 Oct. 1983, p. 229 [1376].
Bell Robert P.
Levy Stewart J.
Michaelson Peter L.
Micro Motion Inc.
Pezdek John V.
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