Patent ID: 6895814

Claim:
Method for measuring fill levels by means of a level indicator that emits measuring pulses (M) onto a surface (O) of a material (F) that is filled into a container (B) and receives first echo pulses (E 2 ) directly reflected by the surface (O) of the material (F), and second echo pulses (E 3 ) caused by a diffuse reflection on the surface (O) of the material (F) and by a subsequent reflection on a container wall (BW), in order to determine the fill level (H) of the material (F) from the transit time of echo pulses (E 2 , E 3 ), whereby: the first and second echo pulses (E 2 , E 3 ) are filtered by means of a low-pass filter (TP) for providing a single combined echo pulse, which is subsequently evaluated for determining a fill level.