140ACI03000
140ACI03000
①被測介質為液體時,取壓口應位于管道下半部與管道水平線成0°-45°范圍內,如圖2-42(a)所示。取壓口位于管道下半部的目的是保證引壓導管內沒有氣泡,這樣由兩根引壓導管內液柱所附加在差壓變送器正、負壓室的壓力可以相互抵消;取壓口不宜從底部引出.是為了防止液體介質中可能夾帶的固體雜質會沉積在引壓導管中引起堵塞。
②被測介質為氣體時.取壓口應位于管道上華部與管道垂直中心線成0°-45°范圍內,如圖2-42(b)所示,其月的是為了保證引壓導針中不積聚和滯留液體.
③被測介質為蒸汽時,取壓口應位于管道上半部與管道水平線成0°-45°范圍內. 如圖2-42(c)所示,zui常見的接法是從管道水平位界接出,并分別安裝凝液罐,這樣兩根引壓導管內部都充滿冷凝液,而且液位高度相同.
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