Example: GAD10 mine intrinsically safe tension sensor for mining intrinsically safe electrical equipment, the sensor is suitable for coal mines, coal mines, coal plants and other workplaces, as a belt conveyor belt monitoring belt tension. Its working principle: the tension signal is transformed into the corresponding current signal and sent to the programmable control box, through which the corresponding control signal is output. When the pressure reaches the alarm value, the programmable control box voice alarm (lower than the lower report "tension is too small", more than the upper report "tension over the limit"), so as to control the start of the tension motor work, the belt tension will be adjusted to within the range of the set value. Through the key can be set in different values (0 ~ 10) t within the tension protection, to realize the tension protection.