测定和控制气体中的氧含量,对工农业生产、国防和科研等各部门都很重要。尤其是在煤矿井下,矿井气体中氧含量的及时、快速、准确测定,直接关系到煤矿的安全生产。据测试,当空气中氧含量达17%时,工人在劳动中就会出现心跳口喘;当氧含量在14～12%以下时,就能使人因缺氧而窒息。因此,煤矿《保安规程》中明确规定,矿井采掘工作面氧含量不得低于 Determination and control of oxygen content in the gas, the industrial and agricultural production, national defense and scientific research and other departments are very important. Especially in the coal mine, the mine gas oxygen content in a timely, rapid and accurate determination, is directly related to the safety of coal mines. According to the test, when the oxygen content in the air reaches 17%, the worker will feel heartbeat and asthma during work. When the oxygen content is below 14-12%, people can suffocate due to lack of oxygen. Therefore, the coal mine “Security Regulations” clearly stipulates that the mining face oxygen content of no less than