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An air purge system is used to flush electrical control equipment with clean air before it is turned on. This ensures that the functionality of the equipment is not affected or damaged by the contaminants from the surrounding environment. Air purge systems are employed for control and analytic technology that is exposed to flue gas resulting from an industrial process. Purging units are central because they maintain a clear boundary path and also ensure that the optical system of the instrument remains clean during prolonged operation. Some systems advanced processes serve to prevent corrosion of other system components by flue gas.〔http://www.muleshoe-eng.com/sitebuildercontent/sitebuilderfiles/s4Ch19purge.pdf〕 right == Air requirements == Air drawn through the system must be clean, dry and oil free in order to protect the delicate optical equipment including mirrors and lenses. It is crucial that the design of the system ensures that the flow of air does not draw in any contaminants from outside sources. In a faultily designed system, dirt can be brought into the control area rather than drawn out as a result of the complexity of airflow components. Although negative pressure might seem to draw an adequate amount of air through the affected area to prevent a buildup of dust and fumes, fluctuations in process conditions, operation anomalies, and environmental conditions when the plant is not operational can all lead to contamination and/or damage to instruments. These changing factors make purge air protection a vital element. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Air purge system」の詳細全文を読む スポンサード リンク
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