Pressure transducer

US9897502B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

• Elmar Wosnitza · Glückstadt, DE
• Davide Parrotto · Weil am Rhein, DE
• Lars Karweck · Binzen, DE
• Ulrich Buder · Berlin, DE
• Olaf Textor · Bad Kötzting, DE

Key dates

• Filing date: Aug 11, 2014
• Grant date: Feb 20, 2018
• Expiry date: Oct 15, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L27/007
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A pressure transducer comprising a resistive pressure sensor element with a measurement membrane which has at least four resistor elements. The resistor elements are arranged in a full-bridge circuit, having a longitudinal direction in which the full bridge circuit is to be supplied with a constant current. When being supplied with the constant current, a longitudinal voltage has a first pressure dependency and a first temperature dependency, and a diagonal voltage has a second pressure dependency and a second temperature dependency, the second pressure dependency being greater than the first pressure dependency at a given temperature. The pressure transducer has a processing circuit which is designed to determine a measured pressure value at least using the diagonal voltage and optionally the longitudinal voltage. The processing circuit is further designed to check whether a value pair of a longitudinal voltage and a diagonal voltage corresponds to an expected functional relationship at a current temperature.