Patent ID: 8245662

Claim:
A configuration for dynamic control of a liquid supply to a moisturizing storage device for a moisturizing apparatus for application of a sealing liquid to envelope flaps of letter envelopes and having a tank for storing the sealing liquid, the configuration comprising: a pump for supplying the moisturizing storage device with the sealing liquid from the tank; an evaluation and control circuit; at least one sensor electrically connected to said evaluation and control circuit and disposed in an area of the moisturizing storage device in a movement path of the envelope flaps, said sensor producing a signal to initiate said pump when an envelope flap passes said sensor; electrodes connected during operation to said evaluation and control circuit, said electrodes including: device electrodes disposed in the moisturizing storage device and forming at least first and second measurement cells, and tank electrodes defining a third measurement cell disposed in said tank; said evaluation and control circuit programmed to: on wetting of said tank electrodes of said third measurement cell by the sealing liquid, measure a resistance measured value of the sealing liquid stored in the tank of the moisturizing apparatus; perform a subsequent qualitative analysis for determining a nature of the sealing liquid used on a basis of at least one of a determined electrical conductance and a determined specific electrical conductivity and at least one corresponding material parameter functioning as a comparison value; carry out measurements of further resistance measured values corresponding to an amount of the sealing liquid stored in the moisturizing storage device; and carry out dynamic control of the liquid supply to the moisturizing storage device in dependence on the corresponding material parameter and of at least one of a conductance determined from the further resistance measured values or a corresponding value of a specific electrical conductivity determined during the measurements of the amount of the sealing liquid stored in the moisturizing storage device.