Abstract: A pressure sensor has a housing in which at least two diaphragms are secured in such a manner that they include a volume which is filled with a hydraulic fluid. The incompressible hydraulic fluid serves to transmit pressure between the diaphragms. For introducing the hydraulic fluid one diaphragm is provided with an opening. A narrow tube is connected in fluid-tight manner to the edge of the opening. The hydraulic fluid is introduced through the initially still open end of the narrow tube. After the filling with hydraulic fluid the open end of the narrow tube is sealed in fluid-tight manner, for example by squeezing. The narrow tube can serve at the same time a force-transmitting or travel-transmitting member which connects the diaphragm to a force or travel sensor.

Abstract: A deflecting spring for distance or force measurement, particularly suited for use in force or pressure gauges and made of an areal spring material is provided with a force introducing section (2), a clamping section (6), and an intermediate section (45) connected to the first two sections (2,6) by flexural webs (10-13) which are equipped with sensor elements serving to convert bending into electrical signals. The intermediate section comprises two part sections (4,5) disposed at either side of an axis of symmetry (S) of the deflecting spring and each connected by a first web (10,11) with the force introducing section and by a second web (12,13) with the clamping section (6). By virtue of this design of the deflecting spring the respective webs belonging to a part section each are deflected in opposite directions when the force introducing section (3) is bended so that also opposite output signals are generated by the sensor elements.