Product Name: two parameters of the methane oxygen alarm 

 Product Model: CJYB4/25 the 

 Coal safety sign: MFA080038 

 Description: 
 The product is the latest generation of dual-parameter intelligent detector can continuously detect the presence of flammable, explosive flammable gas mixture in gas concentration, with sound and light alarm clock, voltage, undervoltage alarm, zero auto-tracking, adjustment characteristics, ease of use. 

 The main characteristics and uses: 
 The two parameters of the type CJYB4/25 methane oxygen Alarm built-in import electrochemical oxygen and heat Methane two sensors, a single chip control system, four LED display that can simultaneously measure the oxygen in the air and methane concentration in one machine. The instrument not only has the sound and light alarm clock display, voltage measurement, automatically shut down lights function, but also accurate and reliable, small size, light weight, simple operation, easy maintenance features. This instrument is widely used in the presence of flammable, explosive, continuous monitoring of the working environment of the combustible gas mixture of oxygen and methane concentration. 

 How it works: 
 When the instrument used to measure the concentration of methane in the air, the methane gas through the transom of the instrument into the electrical signal of methane sensor circuit output is proportional to the concentration of methane in the gas chamber, gas chamber, input signal by the conditioning circuit method within the microcontroller A / D converter converts the digital signal after the data processing, digital display of methane concentration, when the concentration of methane exceeds the set alarm points, apparatus, audible and visual alarm. When the instrument used to measure the concentration of oxygen in the air, the oxygen sensor in the air react with oxygen to produce electrical signals proportional to the oxygen concentration, the amplification of the signal by the conditioning circuit within the input single-chip A / D converter conversion to digital signals, After data processing by the digital display of oxygen concentration, when the oxygen concentration below the set alarm points, apparatus, audible and visual alarm. When methane and oxygen concentration is above or below the alarm set point, the instrument sound and light alarm, and alternately display the concentration of methane and oxygen. The instrument has the function of the anti-high concentration of methane impact, when the instrument for 30 seconds is detected methane concentration greater than or equal to 4.00% in the air, automatically cut off the supply of methane sensor and alarm. The instrument has a low battery voltage alarm and automatic shutdown. 

 The main technical indicators: 

 Item Specification 
 Measuring range (0 ~ 4)% of CH4 (0 to 25)% O2 
 The basic error of ≤ ± 10% 

 ≤ ± 3% 

 Sensor life> 12 months> 24 months (import electrochemical) 
 Response time <20s 
 4 LED display 
 Alarm method intermittent audible and visual alarm, alarm points continuously adjustable 
 Alarm point continuously adjustable (factory setting 1% CH4, 18% O2) 
 Intensity of sound level ≥ 80dB 
 Degree of protection IP54 
 Battery Pack Ni-Mh1800mAh × 3 
 Continuous working time> 15h 
 Explosionproof Type Exibd I 
 Dimensions 116 × 56 × 25mm 
 Weight 0.2kg 
 Equipment monomer combination charger