A pressure sensor that responds to a predetermined rate of change of pressure in the fluid medium comprises a housing that encloses a pressure chamber which has a divider wall that consists of a printed circuit board and a flexible diaphragm which is permeable. The divider wall serves to separate the...http://www.google.fr/patents/US5119066?utm_source=gb-gplus-shareBrevet US5119066 - Pressure sensor system
