Method and system for detection and compensation of a rapid temperature change on a pressure measurement cell

US8099249B2 · kind B2 · utility

Assignee

• VEGA Grieshaber KG · DE

Inventors

• Joern Jacob · Kirnbach, DE
• Holger Gruhler · Tuningen, DE

Key dates

• Filing date: Sep 22, 2009
• Grant date: Jan 17, 2012
• Expiry date: Aug 6, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L9/125
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention is a method and system for detection and compensation of a rapid change in temperature on a pressure measurement cell, in which a measurement signal proportional to the deflection of a diaphragm is generated by means of a sensor. A reference signal proportional to the deflection of the diaphragm is generated by a second sensor; and, measured values are generated by a microprocessor from the measurement signal while the respective reference values are generated from the reference signal. The reference values are compared with the expected values from a tolerance band, and either a pressure-induced deflection of the diaphragm is detected when there is a correspondence, and the measured values are output as measured values for the measured pressure; or, if there is not a correspondence, a deflection of the diaphragm due to a rapid change in temperature is detected, the measured values are corrected and output.