灵敏度是反映报警器性能的重要指标，一般按可燃气体的爆炸下限（可燃气体与空气混合发生爆炸的低浓度）来设定，其低限报警设定值应在50%LEL左右，仅有一个报警设定值时应符合低限报警设定值。监测不同的燃气，报警器的灵敏度设定值是不一样的，所以在选用时，必须搞清楚报警器安装场所使用的是何种燃气，再选用有针对性的报警器。目前由于燃气器具燃烧产生的废气中含有CO，而CO对人体的危害程度极大。所以家庭用户在选用报警器时，好能选用又探测器的报警器，既能对燃气泄漏报警器，也能对CO超标报警，起到双保险的作用Sensitivity is the most important index to reflect the performance of the alarm, according to the explosion limit of flammable gas (the lowest concentration of combustible gas and air mixture explosion) to set the lower limit alarm set value should be about 50%LEL, only an alarm set value should be consistent with the low limit alarm setpoint. Monitoring the sensitivity settings of different gas and alarm is different. Therefore, when selecting, we must find out what kind of gas is used in the installation area of the annunciator, and select the targeted alarm. At present, CO is contained in the exhaust gas produced by the combustion of gas appliances, and the harm of CO to the human body is great. Therefore, when family users choose the alarm, they are better able to choose the detector of the detector, which can play a double insurance role for the gas leakage alarm and the CO over standard alarm.