Flow sensor calibration
December 16, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2389615 Mass flow meter with reduced attitude sensitivity Air flow rate measuring apparatus Flow rate measuring apparatus having vortex-generating element and hot wire element Hot film fluid flowmeter with auxiliary flow sensing Solid state mass air flow sensor Adjustable laminar flow bypass Zero point compensating circuit Flow sensor Patent #: 5150611 InventorAssigneeApplicationNo. 809275 filed on 12/16/1991US Classes:73/1.34With signal processing, span or set point adjustment (e.g., zero correction)ExaminersPrimary: Noland, TomAttorney, Agent or FirmForeign Patent References
International ClassG01F 025/00AbstractA method and apparatus for calibrating a flow sensor composed of two heat sensors each having an electrical impedance parameter which varies as a defined function of the temperature of the heat sensor and disposed in thermal communication with a fluid such that the relation between heat flow to or from one sensor and heat flow to or from the other sensor varies with the rate of fluid flow, a source supplying electric power at a selected level to the heat sensors, and an output device connected to produce an output signal representative of that heat flow relation, calibration being performed by: establishing a known flow rate for the fluid; electrically connecting one of the heat sensors to a circuit element which alters the magnitude of current flowing through the one heat sensor; and determining, in a first determining step, output signal value while the one heat sensor is electrically connected to the circuit element.Other References
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