由于可燃气体报警器属于消防类安全防护产品，很多地方对可燃气体报警器进行了强制性安装检查，要求公共场所、石油石化等存在可燃性气体的环境必须安装有复合防爆规范的可燃气体报警器。但是很多客户，不知道如何正确安装可燃气体报警器，以下是标准规范安装详解。

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1、根据使用环境，选择主要检测的具体可燃性气体，因为可燃气体报警器的核心零部件气体传感器根据行业规定需要进行标定，作为检测的主要依据，这个跟具体检查的可燃性气体密切相关，如甲烷、甲苯、甲醇、环氧乙烷、汽油、煤油、喷气燃料等可燃性气体种类不同，检测标准存在一定的差异，也正是保障安全检测的基础。

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2、根据具体环境，设计可燃气体报警器系统设计方案，需要考虑燃气管道覆盖范围来选择安装点、可燃性气体与空气的比重来选择安装位置、待检测环境的具体面积来决定使用可燃气体探测器数量和气体报警控制器主机选型。

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3、前期工作完成后，就需要安装可燃气体报警器了，这个时候一般厂家都提供电话指导或者现场指导，因为安装可燃气体报警器没有任何技术含量，只需要知道正负极即可连接好可燃气体探测器和气体报警控制器主机。

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4、具体安装操作，安装之前的可燃气体报警器系统设计方案，来走线路、固定可燃气体探测器、连同电源线和气体探测器。具体要看走的哪种信号：1、4-20mA信号输出，还是RS485信号输出，此处以后者为案例。逐个串联连接好可燃气体探测器。

5、固定气体报警控制器主机，并根据系统设计方案连接距离*近的可燃气体探测器，连通之后进行通电测试，看看气体报警控制器主机显示屏上每个可燃气体探测器是否正确连同，确认后，进行测试。

6、测试可燃气体报警器系统非常简单，携带一定浓度的可燃气体放在靠近可燃气体探测器的位置，等1-3分钟充分检测后，气体报警控制器主机会显示次可燃气体探测器检测出可燃气体泄漏的浓度数值，表示正常。其余探头，如法炮制即可。

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三片式球阀如何区分半包和全包

洁净阀门之所以称为洁净，很大原因在于其内部结构是洁净卫生的；

什么是卫生？拆分开来理解，卫是保护和维护的意思，生是指健康和安全；

所以，卫生球阀应该是高洁净的，是无死角的，是不会因为介质的残留，而产生细菌的风险；

如图下图，半包结构和全包结构的对比一目了然，

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全包和半包，是指球阀密封衬垫对球体的包覆程度的不同，包覆程度越高，阀腔的空间则越小，阀腔成了积液的不稳定因素。

严格意义上讲，半包球阀不能称为卫生阀门，因为有残留，有死角，在使用上有一定的局限性，可以走水和气。

而全包球阀，球座采用全包式设计，且满足CIP/SIP杀菌和清洗要求，很好地解决了物料残留在阀腔内的问题，故全包球阀，又称为无滞留球阀；

说起球阀的阀芯密封(阀座密封），普遍采用PTFE(聚四氟乙烯）材料，成本较高，全包球阀与半包球阀的价格差异就体现在此；

市场＊＊通的有些球阀，其阀座密封比半包还要薄，形如平垫，犹如硬币厚度，随着阀门启闭次数的增加，受制于加工精度，阀座密封的变形量会显著加大，球阀内漏是大概率的，还有的干脆用厚硅胶垫片，球俨然成了浮球，耐磨性能可见一斑；

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■流量单位换算表 CONVERSION FACTORS FOR UNITS OF FLOW
TO COVERT FROM TO	l/SEC	l/MIN (LPM)	m³/h	m³/min	ft³/h (SCFH)	ft3/min
l/SEC	1	60	3.6	0.06	127.14	2.119
1 / MIN (LPM)	0.017	1	0.06	0.001	2.119	0.035
m³/h	0.278	16.667	1	0.017	35.317	0.059
m3/min	16.667	1000	60	1	2118	35.317
ft³/h(SCFH)	0.008	0.472	0.0283	0.000	1	0.017
ft³/ min	0.472	28.315	1.699	0.0283	60	1

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