Sensor arrangement for determining a tank fill level and tank having said sensor arrangement

The invention relates to a sensor arrangement for determining a tank fill level of a liquid (7), especially a reducing agent for removing nitrogen from the exhaust gases of an internal combustion engine, which liquid is contained in a tank (5), at least two electrically conductive measuring electrodes (14, 16) of different length being arranged substantially parallel relative each other and being adapted to be arranged substantially perpendicular in the tank. The measuring electrodes are at least partially embedded in a carrier (8, 32) that is produced of an electrically non-conductive material. The measuring electrodes are rigidly fastened relative to the carrier (32) on one side (17) by locking means (38) and are radially held on the other side by radial holding means (42) of the carrier in such a manner as to compensate a heat-induced variation in length of the measuring electrodes (14, 16) relative to the carrier by an axial compensating movement of the measuring electrodes (14, 16) relative to the holdin