KGJ25 High and Low Thickness Methane Sensor Used for Coal Mine(here is called Sensor for short) is developed for meeting our country’s requirement of testing Methane in underground coal mine well. Sensor can real-time measure and display the Methane Concentration in the coal mine well, which also can produce acousto-optic alarm signal and power-failure signal and output model sigal that corresponds with Methane thickness according to Methane Concentration. The Sensor can be applied to some fixed use for coal mine extracted face, mechanical room and return air roadway,etc.Sensor can not only coordinate with KJ70N coal mine monitoring system of our company, but also can make compatible with other coal mine monitoring system; also can be used for different mining fire testing system.

Main Technical Data:

    1. The form of explosionproof: intrinsically safe type and flameproof type, mark “Exibd I”  
    2． Measuring range:（0 - 100）%CH4
    3． Measurement error
              (0-1)%CH4        δ≤0.1%CH4
              (1-2)%CH4        δ≤0.2%CH4
              (2-4)%CH4        δ≤0.3%CH4
              (4-10)%CH4       ±1%CH4
              (10-100)%CH4     ±10%CH4 Measuring upper limit
    4． Responsing time≤30s；
    5． Distance of remote control ≥5m
    6． Alarming point: （0.5 – 2.5）%CH4  any settings(post as 1%CH4 ex-work)
    7． Point of power failure: （0.5 – 3.0）%CH4 any settings(post as 1.5%CH4 ex-work), power-failure output the state of high level, electric current of outputting is 2mA(at this time,  voltage is more than 3V),and the voltage of the state of low level is less than 0.5V
    8．  Output signal:Frequency（0 – 4）%CH4（200 – 1000 ）Hz 

（4 - 100）%CH4（1200 - 2000）Hz 
                  
    9． Working current: less than 100 mA
    10．Gauged flow: 200 ml/minute
    11．The way of displaying: four digits nixie light disply
       the function code of the 1^st small nixie tube:
              0-low concentration zero point
              1-low concentration sensitivity
              2-low concentration non-linear
              3-alarming point
              4-power-failure point
              5-high concentration zero point
              6-high concentration sensitivity
              7-self-checking
              8-voltage display
               9-high and low concentration conversion
               A-high and low non-linear compensatory parameter 1
               B-high and low non-linear compensatory parameter 2
               C-high and low non-linear compensatory parameter 3