JCB4 portable methane detection alarm, methane detector methane alarm 
 Has been designed using advanced micro-power single-chip microprocessor, micro-power A / D conversion chip, low-voltage high sensitivity methane (CH4) sensor and multi-function LED display and so on. 
 With battery owe, over-voltage protection 
 Remaining battery voltage 
 High concentrations of gas shut off 
 Alarm concentration can be preset 
 The maximum saved display 
 Shutdown delay (to prevent accidental shutdown) 
 Smart zeroing 
 Sensor open circuit alarm shutdown 
 Improve function, excellent technical characteristics, stable and reliable, safe, easy to use, small size, light weight. 
 Gas detector design, production in line with the GB13486-2000 portable thermal catalytic methane detection alarm]. 
 2 The main purpose and scope of 
 Gas detectors are mainly used in explosive environment need to detect methane (gas), such as mines, methane filling stations and a variety of methane (gas) users. It can carry a numerical way to display the content of methane in the air (gas); when the content of methane in the air (gas) than the warning value, audible and visual alarm. 
 Environment and working conditions 
 1) Temperature: 0-40 ° C; 
 2) atmospheric pressure 86kpa-106kpa; 
 3) Relative humidity: ≤ 98% (25 ° C); 
 4) Wind speed 0-8m / s, 
 5) without enough to corrode the destruction of the metal shell and electrical insulation gas 
 6) No direct water spray and a strong shock and vibration environment 
 4 main technical parameters 
 (1) explosion-proof type of mining, intrinsically safe and flameproof mark ExibdI 
 (2) The measuring range of 0-4% CH4 
 (3) measurement error (± 0-1)% CH4 10% CH4;> 1% CH4, the true value of ± 10% 
 (4) The alarm range (0.5-2.5)% of CH4 
 (5) alarm error range of ± 0.10% (0.5-1)% CH4 
 (1-2)% of CH4 when the true value ± 10% 
 (6) The alarm sound intensity ≥ 80dB optical visibility in the dark 20m 
 (7) consecutive working hours: 9h battery life (8): charged and discharged 500 times 
 (9) rated the work of voltage DC3.6V open the voltage DC4.3V 
 Rated working current ≤ 240mA short circuit current of 2.6A 
 JCB4 portable methane detection alarm device, methane measuring methane Patrol Alarm