Method and apparatus for automatically determining zero setting of impeller-type mass flow rate-measuring device when flow is absent
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United States of America Patent
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Feb 13, 2001
Grant Date -
N/A
app pub date -
Feb 11, 1998
filing date -
Feb 11, 1997
priority date (Note) -
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Abstract
A method for zero setting of a measuring device in which particles to be measured are subjected to tangential acceleration in a whirling impeller and torque exerted on the vanes of the impeller in reaction to the Coriolis force of acceleration of the particles is being measured as an indication of mass flow rate. The flow of material is fed to a central part of the impeller and by centrifugal force is thrown outwardly of the impeller. The flow is measured by an electronic device including a microcomputer. When the flow is absent, such condition being continually sensed for, the mean value of the torque during a chosen time or a number of revolutions of the impeller is automatically determined and memorized. This memorized torque value is used as a tare value until a next time a new tare value can be memorized.
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