How many kinds of sensors are used for mine gas detection?

1, there are 3 kinds: hanging methane sensor; portable methane sensor; pipeline pumping methane sensor.

2, the sensor (English name: transducer/sensor) is a detection device, can feel the measured information, and can feel the information, according to certain laws, transformed into electrical signals or other required forms of information output, in order to meet the transmission of information, processing, storage, display, recording and control requirements.

3, gas is an ancient plant in the accumulation of coal in the early stages, cellulose and organic matter by the role of anaerobic bacteria decomposition. In the high temperature, high pressure environment, while forming coal, due to physical and chemical effects, continue to generate gas. Gas is a colorless, odorless gas, but sometimes you can smell the aroma similar to apples, which is due to the aromatic hydrocarbon gases and gas at the same time out of the reason. The relative density of gas to air is 0.554, and the density of gas in the standard state is 0.716kg/m? The permeability of gas is 1.6 times that of air, which is difficult to dissolve in water, does not help to ignite and cannot maintain respiration, and when it reaches a certain concentration, it can suffocate a person due to the lack of oxygen, and can burn or explode. Gas in the coal body or surrounding rock is to free state and suction state exists.