公开(公告)号：DE102004019222A1

公开(公告)日：2005-11-10

申请号：DE102004019222

申请日：2004-04-21

Applicant: ABB RESEARCH LTD

Inventor： MILANOVIC RAIKO ,  MERTE ROLF ,  GASCH ARMIN ,  LORITO FABRIZIO ,  MORONI ANDREA ,  VECCHIATO FRANCO ,  BIANCHI CORRADO ,  VOLONTERIO EUGENIO ,  KRIPPNER PETER ,  SCHOLZ WOLFGANG ,  RIEGLER PETER ,  ALTIOK EMRULLAH ,  BISKUP JUERGEN ,  DAAKE WILHELM

IPC: G01L7/00 ,  G01L7/08 ,  G01L13/02 ,  G01L27/00

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.