The AZJ-2000 Portable Methane Detection and Alarm Instrument for Coal Mines is suitable for continuously monitoring methane gas concentration in underground coal mine environments where flammable and explosive combustible gas mixtures exist. The AZJ-2000 Portable Methane Detection and Alarm Instrument for Coal Mines is also suitable for continuously monitoring carbon monoxide gas concentration in underground coal mines and provides audible and visual alarms when the set concentration is reached. The direct-reading dust concentration measuring instrument is used for measuring dust concentration at various locations in underground coal mines.
Main Technical Performance Parameters of the AZJ-2000 Portable Methane Detection and Alarm Instrument for Coal Mines
(1) Portable Methane Detection and Alarm Instrument for Coal Mines:
1. Alarm point adjustable within the range of 0.5-2% CH?.
2. Features display functions for overall battery voltage and alarm point.
3. Equipped with power protection function; alarms when voltage drops below 3.3V.
4. Comes with a charger.
5. Continuous operation time of 10 hours.
6. Atmospheric pressure: 80 kPa - 116 kPa.
7. Operating temperature: 0-40°C.
8. Relative humidity: ≤98% RH (at 25°C).
9. Mine explosion-proof and intrinsically safe type, explosion-proof mark: Exdib.
10. Operating voltage: 3.3V - 4.2V.
11. Operating current: ≤145 mA.
12. Basic error: Measurement range 0-1% ±0.1; Measurement range 1-3% ±10% of true value; Measurement range 3-4% ±3%.
13. Alarm instrument response time not greater than 20 seconds.

Zhengzhou Aidi produces and supplies coal drill cuttings desorption instruments, deep-hole sampling devices, pressure measuring instruments, geological exploration desorption instruments, borehole flow meters, mine gas extraction and outburst prevention equipment, true density measuring instruments for coal, gas content measuring instruments, automatic initial gas emission speed measuring instruments, diffusion speed measuring instruments, and gas parameter instruments for coal extraction pipelines.