Cooper Wiring Devices, Inc.

Brooks Instrument, LLC

Cooper Technologies Company

Brooks Instruments, LLC

Jay J Mendelson

Tucker H Fort

Jean Claude Marcou

Mark B Greenwald

Gunter A Gallas

Yuliy Rushansky

Greogory Moreinis

Jeffrey J Ausfeld

John R Laverack

Andrew C Dymek

Doug B Winner

Joseph Corrado

Joseph C Dille

Anthony Kehoe

Jeffrey L Whiteley

Walter Dennis Robertson, Iii

Erik J Gouhl

Gary Francis Conner

Edward T Fisher

Todd Berger

Christopher A Mazza

Scott Amsbaugh

A method is disclosed for determining leakby in a flow controller () comprising a flow sensor (), a flow control valve () and electronics (). The electronics are coupled to the flow sensor, the flow control valve and configured to adjust the flow control valve in response to the signal of the flow sensor indicating the flow rate of the material such that a set flow rate of material through the flow controller is maintained. The steps of the method comprise determining () a zero drift (Qdrift) value for the flow sensor (). Determining () a flow rate (Qflow) through the flow controller () when the control valve () is in the fully closed position. And determining () the leakby through the flow controller () where the leakby is equal Qflow-Qdrift.

Valve leakby diagnostics

The present invention relates to a system, method, and computer program product for determining the flow rate of a fluid. The system, method, and computer program product generate a thermal sensor based mass flow rate for the fluid, where the thermal sensor based mass flow rate is determined at least in part from the thermal sensor signal (). The system, method, and computer program product generate a pressure sensor based mass flow rate for the fluid, wherein the pressure sensor based mass flow rate is determined at least in part from the pressure sensor signal (). The system, method, and computer program product generate at least one calibration factor (&#x3c8;) using the thermal sensor based mass flow rate and the pressure sensor based mass flow rate. The system, method, and computer program product may generate a calibrated pressure sensor based mass flow rate by using the at least one calibration factor (&#x3c8;) to modify the pressure sensor based mass flow rate. The system, method, and computer program product may generate a calibrated thermal sensor based mass flow rate by using the at least one calibration factor (&#x3c8;) to modify the thermal sensor based mass flow rate.

System, method and computer program for determining fluid flow rate using a pressure sensor and a thermal mass flow sensor

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Hartsdale, NY, United States of America

Jay J Mendelson