Magnetic induction sensor DM-3 serves as a source of an electrical signal used in the automated control equipment of mine conveyors to control the movement of the scraper chain, as well as to control the movement of other mechanisms (screens, crushers, elevators, winches, etc.) with the help of appropriate automation equipment. The sensor is designed to work in conjunction with AUK.1M, AUK.2M equipment and other products of a similar purpose both in mines hazardous for gas and dust, and on the surface in moderate, cold conditions (ambient temperature from minus 60 to 45 ° С) or tropical climate (ambient temperature from minus 10 to 55 ° С) relative humidity up to 100% at a temperature of 35 ° С.