Sensor Unit

A probe with a sensor unit (1) for measuring a measurable variable, especially in an aggressive medium (2) comprising a sensor (4) which is disposed in a sensor casing (3) and provided with a sensor zone (6) located on a base (5) wherein for the detection of the measurable variable in the sensor zone (6) a measuring hole (7) is provided in the sensor casing (3) which allows the medium (2) to advance directly to the sensor zone (6), and a side of the sensor zone (6) that faces away from the measuring hole (7) is equipped with a measuring surface (9) which encompasses measuring electronics (8) wherein for the transmission of a sensor signal generated by the measuring electronics (8) an electrical feeder (10) is provided on the sensor (4), and the sensor (4) is sealingly arranged on a sealing surface (11) located on the sensor casing (3) so that the measuring surface (9) is isolated from the aggressive medium (2), whereas a disconnecting means (12) is provided by means of which the sensor (4) can be disconnected from thermally and/or mechanically induced changes of the sensor casing (3), whereas the probe is especially for measuring a gas pressure and/or a temperature in an engine intake of an internal combustion engine and/or in an engine outlet and/or in a combustion chamber and/or in a crankcase and/or in an exhaust system, or for measuring a pressure and/or temperature of a motor oil, a brake fluid, a hydraulic oil, a gear oil, a coolant, or a cooling fluid, particularly water.