Device and method for the status monitoring of a pressure measuring unit

US7284437B2 · kind B2 · utility

Assignee

• ABB RESEARCH LTD. · CH

Inventors

• Peter Krippner · Karlsruhe, DE
• Wolfgang Scholz · Minden, DE
• Peter Riegler · Boxberg, DE
• Emrullah Altiok · Minden, DE
• Jurgen Biskup · Minden, DE
• Wilhelm Daake · Petershagen, DE
• Raiko Milanovic
• Rolf Merte · Wiesloch, DE
• Armin Gasch · Speyer, DE
• Fabrizio Lorito · Mailand, DE
• Andrea Moroni · Gorla Minore, IT
• Franco Vecchiato · Como, IT
• Corrado Bianchi · Lenno, IT
• Eugenio Volonterio · Tradate, IT

Key dates

• Filing date: Apr 12, 2005
• Grant date: Oct 23, 2007
• Expiry date: May 4, 2025

Classification

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

Abstract

The invention relates to a device and a method for the status monitoring of a pressure measuring unit in an absolute or differential or relative pressure transducer, a pressure-sensitive element installed in the pressure measuring unit being impinged with at least one pressure generated by at least one membrane. During a defined diagnosis time interval, a testing element integrated in the pressure measuring unit is induced to undergo a change in volume, preferably by electrical activation. The pressure difference caused as a result in the pressure measuring unit is registered by a pressure-sensitive element. The curve registered during a diagnosis time interval is compared with a reference curve recorded with the pressure measuring unit intact. A fault indication is given if the deviations between the registered curve and the reference curve exceed predetermined tolerance values.