Pressure gage

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 connection (2) for applying the second pressure (p2), said second connection closing the channel extension (42) (inset 63). This construction serves to provide a pressure gage which is modifiable for use as either an absolute pressure or reference pressure or differential pressure gage and requires a minimum number of different parts adapted to the respective applications, and wherein one of the pressure connections can be fitted in one of the two main surfaces of the pressure gage.