JCB4 type mine explosion Portable Methane Detection Alarm Portable Methane Detection Alarm analyzer handheld methane gas detector has been designed using advanced micro-power single-chip microprocessor, micro-power A / D converter chip, low voltage, high sensitivity methane (CH4) sensors and multifunction LED display. Owe a battery, overvoltage protection, high concentrations of gas remaining battery voltage shutdown alarm levels can be preset to save the displayed maximum delay off (to prevent accidental shutdown) intelligent sensor zeroing open alarm shutdown improve function, excellent technical characteristics, stable and reliable, safe, easy to use, small size, light weight. Gas detector design, production in line [GB13486-2000 portable thermal catalytic methane detection alarm]. 2 Main purpose and scope of gas detector is mainly applied to detect methane (gas) explosive environments such as mines, methane filling stations and a variety of methane (gas) users. It can carry a numerical display of methane in the air (gas) content; when the air methane (gas) content exceeding warning value can be audible and visual alarm. 3 Use of the environment and working conditions 1) Temperature: 0-40 ℃; 2) atmospheric pressure 86kpa-106kpa; 3) Relative humidity: ≤ 98% (25 ℃); 4) wind speed :0-8m / s 5) not enough to corrode damage to the metal casing of the gas and electrical insulation 6) has no direct water spray and a strong shock and vibration environments four main technical parameters (1) Mine intrinsically safe type of protection flameproof flag ExibdI (2) Measuring range 0-4% CH4 (3) measurement error (0-1)% CH4 is ± 10% CH4;> 1% CH4, the true value of ± 10% (4) alarm range (0.5-2.5)% CH4 (5) Alarm error range ( 0.5-1)% CH4 is ± 0.10%> (1-2)% CH4 when the true value of ± 10% (6) ≥ 75dB alarm sound intensity light visibility in the dark 20m (7) Continuous working time: 12h (8) Battery Life: 500 times charging and discharging (9) Rated voltage DC3.6V open circuit voltage DC4.3V Rated current ≤ 150mA short circuit current 2.6A Jining Branch-Mining Equipment Co., Ltd. Contact: Lv