Sensor device, in particular rain sensor and method for mounting a sensor device

A sensor element (1) is coupled via a coupling medium (9) to the screen, and attached to the screen by a fixing device (5). The coupling medium has a hardness of approximately 15 Shore A. A spacer (7) is provided between the sensor element and the screen, for defining the minimum separation, such as 0.3 to 3 mm. An Independent claim is included for a method of mounting a sensor on a screen.