In coal production, with coal mining, coal seams tend to emit mine gas. It is mixed with the air, when the volume percentage of 5% to 16%, the case of fire will explode, to the safety of the mine to bring a huge threat. Therefore, the gas sensor is very important for mine safety, the gas sensor core is black and white original, often used in harsh environments in the coal, the unit may lead to black and white in excess of the reaction with too much methane, resulting in too much difference with the true value. Therefore, the sensor verification and routine calibration is to ensure the accuracy of the sensor and coal mine safety monitoring system is an important part of the normal operation.
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