GJH100 Mining infrared methane sensorDetailed product description：

The GJH100 mining infrared methane sensor uses a multifunctional ultra-low power microcontroller MSP430 as the central processing unit, consisting of amplification circuit, digital display, sound and light alarm, signal output and other unit circuits. The block diagram is as follows:

The sensor circuit is designed with a microcontroller, which can detect and display methane concentration values on site, and output frequency signals (current signals) for remote collection; It can remotely adjust the zero point and sensitivity, and has a fault self checking function, which brings great convenience to use and maintenance. The power circuit of the sensor adopts a switch power supply, which has low overall power consumption and is conducive to extending the transmission distance between the substation and the sensor.

The design of the GJH100 mining infrared methane sensor probe fully considers the harsh environmental conditions and adopts a filtering treatment method, which can effectively filter water and other impurities in the pipeline, ensuring the accuracy of measurement

Technical characteristics of GJH100 mining infrared methane sensor
1. Environmental conditions
Temperature: 0 ℃~40 ℃;
Relative humidity: ≤ 98% RH;
Atmospheric pressure: 80kPa to 116kPa;
Wind speed: 0m/s to 8m/s;
Coal mine shafts containing gas or coal dust explosion hazards.
2. Main technical indicators:
Measurement range: 0.0% CH4~100.0% CH4
Basic measurement error: 0.0% CH4-1.0% CH4 ≤± 0.06% CH4
1.0% CH4-100% CH4 ≤ ± 3% of true value
Display mode: Four digit red digital display
First place: Function display; 1. Zero adjustment 2. Sensitivity adjustment 3. Alarm point adjustment 4. Power off point adjustment 5. Power off recovery value adjustment 6. Self check
Last three digits: display of measured values; (％CH4)
Signal output: 200Hz~1000Hz (1.00mA-5.00mA), linearly corresponding to 0% CH4-100% CH4 signal, effective band load capacity: 0-500 Ω
Sampling method: diffusion type
Response speed: ≤ 20S
Component lifespan: 5 years
Working voltage: 18V Power supply fluctuation range: 9V.DC~24V.DC
Intrinsic safety parameters: Ui: DC18V Ii: 500mA; Ci：3.3uF Li：47uH。
Explosion proof grade: Exib Ⅰ mining intrinsic safety type
Maximum transmission distance: 2km. The matching cables from the sensor to the substation and power box are certified with safety standards and within their validity period. Cable distribution parameters: distributed capacitance: ≤ 0.06 μ F/km; Distributed inductance: ≤ 0.8mH/km; DC resistance: ≤ 12.8 Ω/km).
3. Appearance characteristics of GJH100 mining infrared methane sensor:
Shell Material: Stainless Steel Shell Color: Metallic Gloss Dimensions: 250 × 150 × 60 (mm3)
Weight: 1.67kg