日本研制成功一种装有报警装置的数字式氧气浓度计,为确保地下贮粮仓库等处作业人员的安全提供了一种新手段。 这种氧气浓度计体积小,重量0.3千克,可随身装入衣袋使用。在正常情况下,大气中氧气的浓度为20.9%。当降到18～14%时,人即感到头晕;降到14～12%时,体温上升;当氧气浓度 The successful development of a digital oxygen concentration meter equipped with an alarm device has provided a new means of ensuring the safety of operators at underground storage warehouses and the like. This oxygen concentration meter small size, weight 0.3 kg, can be loaded into the pocket to use. Under normal conditions, the concentration of oxygen in the atmosphere is 20.9%. When it drops to 18 ~ 14%, people feel dizzy; down to 14 ~ 12%, the body temperature rises; when the oxygen concentration