FIELD: chemistry. SUBSTANCE: invention relates to production of anode copper. Device contains bath with molten copper of copper, pipe for melt blowing with air, one end lowered into bath, cutting valve and equipped with bath with reference molten cathode copper, two EMF sources, two resistors, a pair of electrodes immersed in a bath with a reference melt, a pair of electrodes immersed in a bath with molten crude copper, two thermocouples, a microvoltmeter and a microcontroller, wherein EMF sources are connected in opposition by combining their outputs of one polarity and connected to two electrodes immersed in baths with different melts, and two free outputs of sources of EMF of other polarity are connected through resistors to two other electrodes immersed in baths with different melts, thermocouples are submerged one in each bath and connected to microcontroller, input of microvoltmeter is connected to electrodes connected to resistors, and output of microvoltmeter is connected to microcontroller, output of which is connected to valve for cutoff of air blowing. EFFECT: automated accurate determination of the moment of stopping the blasting of the bath with molten crude copper. 1 cl, 1 dwg.