FIELD: anode copper production. SUBSTANCE: invention relates to a device for the production of anode copper. The device contains a bath with blister copper melt, a pipe with a shut-off valve, one end lowered into the bath for supplying air to the melt, a pair of electrodes immersed in the bath with blister copper melt and a microvoltmeter, a signal extremum determination unit, the input of which is connected to the microvoltmeter output, and the outlet is connected to a shut-off valve, the current source is connected to a pair of electrodes, while in the bath with blister copper melt between the pair of electrodes there are additional electrodes connected to the microvoltmeter, and all four electrodes are immersed to the same depth and located in the same plane. As a block for determining the extremum of the signal, for example, a microcontroller is used. EFFECT: increased accuracy of determining the moment of cutoff of air supply to the melt, which prevents further saturation of the blister copper melt with oxygen, thereby improving its quality. 2 cl, 2 dwg.