氨气报警器需要设置报警的低限值和高限值吗?
相信大家都知道,氨气不仅对人体有毒害作用,还会燃烧爆炸,但氨气造成人体中毒时的浓度要比能燃烧爆炸时的浓度低很多,因此,为了确保安全,在一般情况下,氨气报警器都需要按照有毒有害气体设置相关的报警值。那么氨气报警器需要设置报警的低限值和高限值吗?下面逸云天小编为您介绍:

若要考虑氨气的毒性,在氨气报警器设置时就需按照氨气的职业接触限值来设置氨气报警器的报警值。《GBZ 2.1-2019 工作场所有害因素职业接触限值》中规定,氨气的职业接触限值为20mg/m³。根据GBT 50493-2019的第5.5.2条规定,有毒气体的一级报警设定值(低报值)应小于或等于100%OEL(职业接触限值),二级报警设定值(高报值)应小于或等于200%OEL(职业接触限值)。
根据《GB 50058-2014 爆炸危险环境电力装置设计规范》的附表中规定,氨气的爆炸上下限分别为15.00%和28.00%。如果企业在设置时只需考虑其燃烧爆炸的特性,那么设置氨气报警器的报警值时参考爆炸极限设置即可。在《GBT 50493-2019 石油化工可燃气体和有毒气体检测报警设置标准》的第5.5.1条规定,可燃气体的一级报警设定值(低报值)应小于或等于25%LEL(爆炸下限);可燃气体的二级报警设定值(高报值)应小于或等于50%LEL(爆炸下限)。
综上所述,我们可以看出氨气报警器需要设置报警的低限值和高限值的,这样才可以在氨气报警器出现低报或者高报时,更好地通过声光报警或者其他报警方式,来提示人们采取相关的安全措施。另外,由于氨气既有毒又能燃烧爆炸,因此氨气报警器在设置时需要根据现场工况和用户需求来设置,无特殊要求的话按照有毒气体报警器的设置规范设定报警值即可。
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