SENSORVORRICHTUNG, SYSTEM UND VERFAHREN ZUR KONTROLLE EINES ANAEROBEN VERDAUUNGSPROZESSES

The invention relates to a sensor device (1), a system and a method for monitoring an anaerobic digestion process in an electrically conductive liquid comprising organic material. The sensor device comprises a probe (2) comprising at least one working electrode (3) and an auxiliary electrode (4), each electrode having an operative end surface (5) to be arranged in contact with the liquid. The sensor device comprises also a control unit (6) being arranged to apply a voltage pulses between the electrodes and to record an electric current generated as response. The sensor device comprises further an abrasive device (9) having at least one abrading surface (10). The abrasive device is movable in relation to the operative end surfaces and is arranged such that the operative end surface of each electrode is contacted by at least one abrading surface during movement of the abrasive device so as to abrade contaminants bound thereon.