Device that supplies clear rinsing agents in a program-controlled dishwasher

1. A device for checking a concentration of clear rinsing agent in a rinsing liquid of a program-controlled water-carrying household appliance, the device comprising:

a processing unit operatively connectable to a sensor having at least one transmitting element that emits an optical signal and at least one receiving element that receives the optical signal emitted by the transmitting element, the processing unit being operable to determine a wetting of the sensor with clear rinsing liquid and to render an estimate of the concentration of the clear rinsing agent in the clear rinsing liquid as a function of run-off behavior of the wetting of the sensor with the clear rinsing liquid, the processing unit determining the wetting of the sensor with the clear rinsing liquid and rendering an estimate of the concentration of the clear rinsing agent in the clear rinsing liquid based upon an energy level emitted by the transmitting element and received by the receiving element.

2. The device according to claim 1 , wherein a reference value for the run-off behaviour of the clear rinsing liquid is stored by the sensor in the processing unit and is used for a comparison with the run-off behavior of the wetting of the sensor which has been determined by the processing unit.

3. The device according to claim 1 , wherein the sensor has a transparent element into which the transmitting element couples the optical signal and the receiving element receives the optical signal coupled out from the transparent element.

4. The device according to claim 3 , wherein the energy level corresponds to a brightness value produced at the transparent element.

5. The device according to claim 1 , wherein the processing unit is operable to render the estimate of the concentration of the clear rinsing agent in the clear rinsing liquid as the function of the run-off behavior of the wetting of the sensor with the clear rinsing liquid continuously over a period of time.

6. The device according to claim 1 , wherein the processing unit is operable to render the estimate of the concentration of the clear rinsing agent in the clear rinsing liquid as the function of the run-off behavior of the wetting of the sensor with the clear rinsing liquid at consecutive time intervals.

7. A water-carrying appliance, comprising:

means for retaining water during an operational cycle of the water-carrying appliance; and

a device for checking a concentration of clear rinsing agent in a clear rinsing liquid circulated in the means for retaining water, the device including:

a processing unit operatively connectable to a sensor having at least one transmitting element that emits an optical signal and at least one receiving element that receives the optical signal emitted by the transmitting element,

the processing unit being operable to determine a wetting of the sensor with the clear rinsing liquid and to render an estimate of the concentration of the clear rinsing agent in the clear rinsing liquid as a function of run-off behavior of the wetting of the sensor with the clear rinsing liquid and the processing unit determining the wetting of the sensor with the clear rinsing liquid and rendering an estimate of the concentration of the clear rinsing agent in the clear rinsing liquid based upon an energy level emitted by the transmitting element and received by the receiving element.

8. The water-carrying appliance according to claim 7 , wherein the water-carrying appliance is a dishwashing machine.

9. The water-carrying appliance according to claim 7 , wherein the water-carrying appliance is a household appliance.

10. The water-carrying appliance according to claim 7 , wherein a reference value for the run-off behaviour of the clear rinsing liquid is stored by the sensor in the processing unit and is used for a comparison with the run-off behavior of the wetting of the sensor which has been determined by the processing unit.

11. The water-carrying appliance according to claim 7 , wherein the sensor has a transparent element into which the transmitting element couples the optical signal and the receiving element receives the optical signal coupled out from the transparent element.

12. The water-carrying appliance according to claim 11 , wherein the energy level corresponds to a brightness value produced at the transparent element.

13. The water-carrying appliance according to claim 7 , further comprising:

a dosing device that supplies clear rinsing agent to the clear rinsing liquid in the means for retaining water,

wherein the processing unit delivers a signal to the dosing device to supply clear rinsing agent to the clear rinsing liquid based on the estimate of the concentration of the clear rinsing agent in the clear rinsing liquid.

14. A program-controlled water-carrying household appliance, comprising:

a washing chamber for retaining water during an operational cycle of the water-carrying appliance; and

a device that monitors a concentration of clear rinsing agent in a rinsing liquid in the washing chamber,

the device comprising:

a sensor having at least one transmitting element that emits an optical signal and a receiving element that receives the optical signal emitted by the transmitting element, the sensor arranged in the washing chamber in such a manner that the clear rinsing liquid wets the sensor and runs off the sensor;

a processing unit operatively connected to the sensor and receiving from the sensor an energy level of the optical signal emitted by the transmitting element and received by the receiving element during run-off of the clear rinsing liquid from the sensor, the processing unit programmed to determine, based on the received energy level, a wetting of the sensor with the clear rinsing liquid and render an estimate of the concentration of the clear rinsing agent in the clear rinsing liquid as a function of run-off behavior of the wetting of the sensor with the clear rinsing liquid.