Apparatus for monitoring a field device

US7095365B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

• Peter Klofer · Steinen, DE
• Volker Dreyer · Lörrach, DE
• Sergej Lopatin · Lörrach, DE
• Roland Muller · Weiling, DE
• Herbert Schroth · Schopfheim, DE

Key dates

• Filing date: Jun 17, 2004
• Grant date: Aug 22, 2006
• Expiry date: Nov 8, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G08B21/16
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The invention relates to an apparatus for monitoring a field device for determining and/or monitoring a physical and/or chemical process parameter of a process medium with a first sealing stage facing toward the process and at least one housing with a predetermined interior volume. The housing is located on the side of the first sealing stage facing away from the process, wherein energy is transferable through the first sealing stage 4 in the direction of the process medium. This energy interacts with the process medium, wherein at least one detector unit is provided in the housing, which unit monitors at least one condition parameter of the interior volume of the housing. A control/evaluation device determines, on the basis of the energy interacting with the process medium, the physical and/or chemical process parameter, and wherein the control/evaluation unit and/or another monitoring unit recognizes and/or seals off and/or issues an alarm, on the basis of the monitored condition parameter in the interior volume of the housing, as soon as the monitored condition parameter in the interior volume of the housing a predetermined limit value.