Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...
Patent
1986-10-03
1988-04-19
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Mass flow by imparting angular or transverse momentum to the...
G01F 184
Patent
active
047381442
ABSTRACT:
Improved drive means for oscillating the flow tubes of a parallel path Coriolis mass flow rate meter is described herein. The basic meter is known and comprises two substantially parallel flow tubes having oscillation axes and torsion axes. A pair of sensors sense the movement of the flow tubes about these axes with the time difference between the outputs of these sensors being indicative of the mass flow rate of the fluid. A drive means oscillates the tubes and comprises a coil and magnet-keeper arrangement. The present invention provides improved drive means comprising a rare earth-iron magnet having an annular configuration with a cup-shaped keeper member disposed thereabout to form an annular spacing. The magnet and keeper are affixed to the midpoint of one of the tubes. A coil is affixed to the other of the tubes with the coil interfitting into the annular spacing. The coil is so formed that the inductance does not exceed about nine millihenries. A drive circuit generates a periodic driving potential which provides a driving current in the range of from about 50 mA to about 250 mA. The driving force is determined by the product of the drive current times coil turns times a predetermined constant. The drive means has a lower stored energy capability allowing the meter to be used in dangerous atmospheres such as hydrogen.
REFERENCES:
patent: Re31450 (1983-11-01), Smith
patent: 3319201 (1967-05-01), Coen
patent: 3803522 (1974-04-01), Rooney
patent: 4422338 (1983-12-01), Smith
patent: 4491025 (1985-01-01), Smith
Micro Motion Model D Mass Flow Meters, Dec. 1985, Instruction Manual.
Goldstein Herbert
Micro Motion Inc.
Palmer William D.
Pezdek John V.
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