Product description: a new generation of BMK-III portable mine gas blastability tester, is used in mining coal mine intrinsically safe instrument, proof mark Exib I Mb (150 ℃), explosion-proof card number is 320141133, coal safety certificate No. MAK140161. The main technical parameters: 1, methane measuring range: 0 ~ 100% CH4 2, oxygen measuring range: 0 to 30% 3, carbon monoxide measuring range: 0 ~ 2000ppm sensor life:? O2 sensor life: more than two and a half (working life) ? CO sensor life: more than two and a half (working life) of the UK's most advanced non-dispersive infrared DYNAMENT CH4 sensor life of more than five years of product advantages:? ◆ ◆ new third-generation sensor measuring range up to a maximum lifetime ◆ High resolution? LCD works: BMK-Ⅲ portable mine gas analyzer Blastability when testing, the sampler to extract gas samples by O2, CH4, CO sensor to detect electrical signals generated by the circuit amplified by the analog switch for gating the detection signal, the analog signal by the A / D conversion, converted into digital signals to analog ARM processor, the data processor is received by the software program for data processing operation, the elimination of nonlinearities , temperature compensation, with the correction value is displayed on the LCD screen O2, CH4, concentration CO, and triangles show the explosion and gas component of the coordinate point on the LCD screen, when approaching or reaches the set alarm value graphic alarm audible alarm. Explosion triangle: a new generation forecasting instrument for underground mines, by ambulance crews, firefighters and emergency personnel are allowed to enter the fire zone or accident scene to monitor the working environment if there is danger of explosion, as well as the operating environment is excessive levels of carbon monoxide, for staff Life is a threat. Mine air is transported from the ground to the underground, surface oxygen content of the atmosphere is a constant, that is 20.93%, changes in the oxygen content of the coal mine was caused by the underground environment mixed with other gases. If mixed with 5% of the CH4 content of the 02 atmospheric mixing ratio will be reduced by 1%. Combustible gases in coal mines, explosive mix in the air, lower explosion limit CH4 is 5%, O2 was 19.88%, that figure point A; limit CH4 is 15%, O2 was 17.79%, that figure point B; That is the critical point C CH4 was 5.18%, O2 was 9.47%. The A, B, C three coordinates of the point connections constitute "explosive triangle" pattern, as shown below. According to detect the resulting data to calculate the coordinates of CH4 and 02 points in the "explosive triangle" position on the instrument display can be observed directly to the gas component in the "explosion triangle '.