140ACI03000
140ACI03000
①被測介質(zhì)為液體時,取壓口應(yīng)位于管道下半部與管道水平線成0°-45°范圍內(nèi),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(dǎo)管內(nèi)沒有氣泡,這樣由兩根引壓導(dǎo)管內(nèi)液柱所附加在差壓變送器正、負(fù)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(zhì)中可能夾帶的固體雜質(zhì)會沉積在引壓導(dǎo)管中引起堵塞。
②被測介質(zhì)為氣體時.取壓口應(yīng)位于管道上華部與管道垂直中心線成0°-45°范圍內(nèi),如圖2-42(b)所示,其月的是為了保證引壓導(dǎo)針中不積聚和滯留液體.
③被測介質(zhì)為蒸汽時,取壓口應(yīng)位于管道上半部與管道水平線成0°-45°范圍內(nèi). 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(dǎo)管內(nèi)部都充滿冷凝液,而且液位高度相同.
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Banner Engineering: STP-9 Specified Test Piece. 3.25"
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