Pressure gage

US5079953A · kind A · utility

Assignee

• Endress u Hauser GmbH u Co. · DE

Inventors

• Rainer Martin · Bochum, DE
• Georg Schneider · Coburg, DE

Key dates

• Filing date: Jul 18, 1990
• Grant date: Jan 14, 1992
• Expiry date: Jul 18, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L19/14
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

This pressure gage has a housing (b 10) with a first connection (1) for applying a first pressure (p1), an interior space (11) for receiving, mounting, and sealing a sensing element (3..), a wall (12) enclosing the interior space and having a channel (41) therein for guiding reference air or a second pressure (p2), and a cover (5). The sensing element (3..) comprises a diaphragm (31), to the outer side of which the first pressure (p1) is applied, and a substrate (32) having an opening (33) through which pressure is applied to the inner side of the diaphragm (31). The cover (5) has at least one feedthrough bushing (51) for electric leads (52) to the sensing element, means for sealing the interior space (11) from the environment of the pressure gage, a channel extension (42) extending the channel (41) in the wall (12) to an opening in the cover, and an inset which is sealed in the opening of the cover and which either is solid (inset 61) or has a connecting channel (43) between the channel extension (42) and a lengthening part (34) extending from the inner plane of the cover (5) to the opening (33) in the substrate (32) of the sensing element (inset 62) or is designed as a second con…