GUH100 coal-bit humidity sensor 1. Working conditions (1) altitude does not exceed 2000m; (2) Ambient temperature: -10 ℃ ~ +40 ℃; (3) The average relative humidity: ≤ 95% (+25 ℃); (4 ) Atmospheric pressure: 80kPa ~ 106kPa; (5) there is an explosive mixture of methane in coal mine underground; (6) No significant vibration and shock of the occasion; (7) no damage to insulation corrosive gases or vapors places. 2 Main features and technical parameters (1) Working voltage: DC12V; (2) Working Current: ≤ 50mA; (3) contact form: passive normally open relay contact output; (4) Action Resistance: 100K ~ 200KΩ adjustable; (5) Action Performance: When compared to dry coal, coal resistance> 100KΩ time (100K ~ 200KΩ adjustable), relay, contact closure; when compared to wet coal, coal resistance ≤ 100KΩ time (100K ~ 200KΩ adjustable), relay reset contacts open; when coal bunker or tape machine without coal, the relay is reset, the contact is disconnected; (6) the transmission of the sensor and the control box cable length ≤ 1000m; 3. coal bunker coal-bit operating principle used, When the coal bunker height position corresponding electrode touching the probe and the control input of the intrinsically safe circuits form a loop through circuit switching, the output control signal. Belt conveyor for coal wet and dry measurement, when the tape machine to run on coal, the sensor probe and two probes to coal, coal to form inside the sensor circuit through the loop, when the probe between the coal resistance is greater than 15M, delay 6 - 10S relay reset, the contact is opened; when coal between the probe resistance is less than 100K relay reset, contacts open; when coal is greater than 100K when resistance is less than 15M, 6-10S delay relay, normally open contact closure; Jining City Branch- Mining Equipment Co., large favorably, please call