Patent ID: 8122771

Claim:
Pressure sensor unit for mounting in an opening through a pipe wall or chamber wall for measuring pressure in a process fluid in the pipe/chamber, which pressure sensor unit comprises: a shaft part which protrudes through the opening and has an inner end protruding into the process fluid, a flange part fastened on the outer end on the shaft part for providing sealing against the outer end of the opening, a pressure sensor element arranged in a sensor chamber in the flange part, and a hydraulic pipe mainly arranged along the length of the shaft part between the sensor chamber and a membrane room behind a separating membrane which transfers the process fluid pressure to a hydraulic fluid in the hydraulic pipe, which separating membrane is arranged at the shaft part inner end, characterized in that the shaft part inner end is provided with perforations for admitting process fluid into the inner room of the shaft part, and that separating membrane is arranged on a block suspended in the inner room of the shaft part immediately behind the perforations.