2010-12-6 19:39:00

怎样选择合适的有毒有害气体检测仪

对于各类不同的生产场合和检测要求，选择合适的气体检测仪是每一个从事安全和卫生工作的人员都必须十分注意的。这里我们将就一些具体情况做一介绍，供大家参考。     确认所要检测气体种类和浓度范围:     每一个生产部门所遇到的气体种类都是不同的。在选择气体检测仪时就要考虑到所有可能发生的情况。如果甲烷和其它毒性较小的烷烃类居多，选择LEL检测仪无疑是最为合适的。这不仅是因为LEL检测仪原理简单，应用较广，同时它还具有维修、校准方便的特点。如果存在一氧化碳、硫化氢等有毒气体，就要优先选择一个特定气体检测仪才能保证工人的安全。如果更多的是有机有毒有害气体，考虑到其可能引起人员中毒的浓度较低，比如芳香烃、卤代烃、氨(胺)、醚、醇、脂等等，就应当选择前章介绍的光离子化检测仪，而绝对不要使用LEL检测器应付，因为这可能会导致人员伤亡。     如果气体种类覆盖了以上几类气体，选择一个复合式气体检测仪可能会达到事半功倍的效果。     确定使用场合:     工业环境的不同，选择气体检测仪种类也不同。     A)固定式气体检测议:     这是在工业装置上和生产过程中使用较多的检测仪。它可以安装在特定的检测点上对特定的气体泄漏进行检测。固定式检测器一般为两体式，有传感器和变送组成的检测头为一体安装在检测现场，有电路、电源和显示报警装置组成的二次仪表为一体安装在安全场所，便于监视。它的检测原理同前节所述，只是在工艺和技术上更适合于固定检测所要求的连续、长时间稳定等特点。它们同样要根据现场气体的种类和浓度加以选择，同时还要注意将它们安装在特定气体最可能泄漏的部位，比如要根据气体的比重选择传感器安装的最有效的高度等等。     B)便携式气体检测仪：     由于便携式仪器操作方便，体积小巧，可以携带至不同的生产部位，电化学检测仪采用碱性电池供电，可连续使用1000小时;新型LEL检测仪、PID和复合式仪器采用可充电池(有些已采用无记忆的镰氢或鲤离子电池)，使得它们一般可以连续工作近12小时，所以，作为这类仪器在各类工厂和卫生部门的应用越来越广。     如果是在开放的场合，比如敞开的工作车间使用这类仪器作为安全报警，可以使用随身佩戴的扩散式气体检测仪，因为它可以连续、实时、准确地显示现场的有毒有害气体的浓度。这类的新型仪器有的还配有振动警报附件以避免在嘈杂环境中听不到声音报警，并安装计算机芯片来记录峰值、STEL(15分钟短期暴露水平)和TWA(8小时统计权重平均值)为工人健康和安全提供具体的指导。     如果是进入密闭空间，比如反应罐、储料罐或容器、下水道或其它地下管道、地下设施、农业密闭粮仓、铁路罐车、船运货舱、隧道等工作场合，在人员进入之前，就必须进行检测，而且要在密闭空间外进行检测。此时，就必须选择带有内置采样泵的多气体检测仪。因为密闭空间中不同部位(上、中、下)的气体分布和气体种类有很大的不同。比如:一般意义上的可燃气体的比重较轻，它们大部分分布于密闭空间的上讯一氧化碳和空气的比重差不多，一般分布于密闭空间的中慨而象硫化氢等较重气体则存在于密闭空间的下部(如图所示)。同时，氧气浓度也是必须要检测的种类之一。另外，如果考虑到罐内可能的有机物质的挥发和泄漏，一个     可以检测有机气体的检测仪也是需要的。因此一个完整的密闭空间气体检测仪应当是一个具有内置泵吸功能以便可以非接触、分部位检测具有多气体检测功能以检测不同空间分布的危险气体，包括无机气体和有机气侬具有氧检测功能防止缺氧或富辄体积小巧，不影响工人工作的便携式仪器。只有这样才能保证进入密闭空间的工作人员的绝对安全。     此外，进入密闭空间后，还要对其中的气体成分进行连续不断的检测，以避免由于人员进入、突发泄漏、温度等变化引起挥发性有机物或其它有毒有害气体的浓度变化。     如果用于应急事故、检漏和巡视，应当使用泵吸式、响应时间短、灵敏度和分辨率较高的仪器，这样可以很容易判断泄漏点的方位。     在进行工业卫生检测和健康调查的情况时，具有数据记录和统计计算以及可以联接计算机等功能的仪器应用起来就非常方便。

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