| 摘要 |
The invention describes a pressure measuring sensor having an electrically conductive separating diaphragm (5) which closes off an interior space (3) of the pressure measuring sensor to the outside, the outer face of said separating diaphragm being subject to the action of the liquid medium which is under the pressure (p) which is to be recorded, which pressure measuring sensor has an apparatus for identifying a fracture in the separating diaphragm (5), which apparatus is distinguished in that at least one electrode (15, 43) is arranged on an inner face, which faces the interior space (3), of the separating diaphragm (5), said electrode being electrically insulated from the separating diaphragm (5) by means of an insulation layer (17) which is arranged between the electrode (15, 43) and the separating diaphragm (5) and being mechanically connected to the separating diaphragm (5), and a measurement circuit (19, 39) which is connected to a capacitor which is formed by the separating diaphragm (5) and the electrode (15) is provided, said measurement circuit detecting by measurement and monitoring a measurement variable which is dependent on an electrical property of the capacitor, which measurement variable changes owing to medium entering the region of the capacitor in the case of a fracture in the separating diaphragm (5). |
