A circuit for generating a temperature-stable reference voltage, including, between two terminals of application of a D. The system comprises recording means for recording condition values of the technical installation and transmission means for transmitting the recorded condition values to a central maintenance management system, which comprises first means for evaluating the condition values and second means for generating maintenance orders, depending on the result of the evaluation of the condition values. The mobilized constituents are transported either to the anode or the cathode, where the material will adhere and agglomerate with other constituents.