Model KGT15 On/Off Sensor of Electromechanical Equipment can detect operating condition of electromechanical equipment automatically and continuously and transmit the information to the superior monitor and controller. It has no direct electric connection with the detected equipment. It is rational in structure, high in reliability, flexible in use, low in power consumption and good in adaptability. It can be used in coal mine underground with a danger of methane and coal dust explosion, also can be used in general places such as factory, oil field and port.