DEVICE FOR SUPPLYING A LIQUID ADDITIVE

摘要

The invention relates to a device (1) for supplying a liquid additive for a motor vehicle (2) comprising a tank (3) for storing the liquid additive and a conveyor unit (4) for conveying said liquid additive out of the tank (3). In addition a sensor (6) is provided which emits and receives waves and is configured to measure the fill level of the liquid additive in said tank (3) by means of a propagation time measurement of the waves along a measurement path (7) to a liquid surface (7) in the tank (3) and back to the sensor (6) the measurement path (7) at least partially running through a measurement channel (9). In addition at least one back flush line (5) opens into the measurement channel (9) such that the measurement channel (9) may be flushed up to the tank (3) in order for said measurement channel (9) to be kept clean and/or be cleaned.