计算机控制动态气体校准仪的研究和应用
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摘要
空气质量监测是关系到整个人民健康生活水平和国民经济发展的重要方面。作为空气质量监测系统中重要部件之一的气体校准仪起着至关重要的作用,它是最终所得各种监测数据精确度的重要保证。本文选用“动态气体校准仪的研制”这一实际产品开发的课题,具有重要的实际价值。
     动态气体校准仪可以为各种气体监测仪提供多种标准浓度的气体,便于对气体监测仪进行精确的校准,以保证其工作的精确度,从而得到准确的空气质量监测数据。传统的气体校准仪采用电解配气等方法来产生校准气体,但得到的气体浓度不够精确。本仪器采用国际先进的自动控制配气原理,采用精密质量流量控制器(MFC)来控制钢瓶气(某种压缩气体)与零空气(纯净无污染的空气)的混合比来得到精确浓度的校准气体,以便于对各种气体监测仪进行高精度校准。同时,采用标准数字接口作为通信接口,能够实现整个空气质量监测系统的自动化监测。
Air quality is very important to the people's standard of living and economy development. As a part of the system of monitoring air quality, dynamic gas regulator can ensure high precision of data. "Researching and manufacture of dynamic gas regulator" is actual product exploitation, therefore, it has important practical value.
    Dynamic gas regulator can provide all air monitors with many kinds of gases whose concentration is very accurate. Air monitor could be regulated through these regulating gases. Traditional gas regulator get regulating gas through electrolyzing and collocating gas method > mechanical attenuation method, etc. However, these regulating gases is not very accurate. In this gas regulation system, theory of advanced automata is adopted. Using Mass Flux Controller (MFC), gas regulation system achieved accurate mix of two kinds of gases, steel bottle gas (some compressed gas) and zero air (pure air) . For the sake of data transmission between dynamic air regulator and other equipments in the monitoring air quality system, normal digital interface (RS-232C) make correlative role of communication interface so that automatic survey could be achieved.
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