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上海韜世實業(yè)發(fā)展有限公司
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更新時間：2024-11-05 12:41:06瀏覽次數(shù)：989
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72F50-SE0AA1AAA4AA德國進(jìn)口（非導(dǎo)電液體）E+H渦街流量計
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E+H渦街流量計也稱之為旋渦流量計或卡門渦街流量計。綜合吸收發(fā)達(dá)國家*技術(shù)和總結(jié)多年研究生產(chǎn)經(jīng)驗的基礎(chǔ)上進(jìn)行精心設(shè)計的產(chǎn)品，實現(xiàn)了產(chǎn)品智能化、標(biāo)準(zhǔn)化、系列化、通用化、生產(chǎn)模具化、確保產(chǎn)品質(zhì)量的美觀性。該產(chǎn)品具有電路*、功耗微低、量程比寬、結(jié)構(gòu)簡單、阻力損失小、堅固耐用、用途廣、使用壽命長、工作穩(wěn)定、便于安裝調(diào)試等特點。
參數(shù)及要求
◆測量介質(zhì)： 氣體、液體、蒸氣
溫壓補償型渦街流量計——迪元儀表
◆連接方式：法蘭卡裝式、法蘭式、插入式
◆口徑規(guī)格 法蘭卡裝式口徑選擇 25,32,50,80,10
◆法蘭連接式口徑選擇 100,150,200
◆流量測量范圍 正常測量流速范圍 雷諾數(shù)1.5×104～4×106；氣體5～50m/s; 液體0.5～7m/s
正常測量流量范圍 液體、氣體流量測量范圍見表2； 蒸氣流量范圍見表3
◆測量精度 1.0級 1.5級
◆被測介質(zhì)溫度:常溫–25℃～100℃，高溫–25℃～150℃ -25℃～250℃
◆輸出信號 脈沖電壓輸出信號 高電平8～10V 低電平0.7～1.3V
◆脈沖占空比約50%,傳輸距離為100m
◆脈沖電流遠(yuǎn)傳信號 4～20 mA,傳輸距離為1000m
◆儀表使用環(huán)境 溫度:-25℃～+55℃ 濕度:5～90% RH50℃
分離式渦街流量計——迪元儀表
◆材質(zhì) 不銹鋼, 鋁合金
◆電源 DC24V或鋰電池3.6V
◆防爆等級 本安型iaIIbT3-T6，防護等級 IP65
72F50-SE0AA1AAA4AA德國進(jìn)口（非導(dǎo)電液體）E+H渦街流量計
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德國進(jìn)口（非導(dǎo)電液體）E+H渦街流量計原理：在流體中設(shè)置三角柱型旋渦發(fā)生體，則從旋渦發(fā)生體兩側(cè)交替地產(chǎn)生有規(guī)則的旋渦，這種旋渦稱為卡門旋渦，旋渦列在旋渦發(fā)生體下游非對稱地排列。
渦街流量計是根據(jù)卡門渦街原理（Kármán Vortex Street）測量氣體、蒸汽或液體的體積流量、標(biāo)況的體積流量或質(zhì)量流量的體積流量計。并可作為流量變送器應(yīng)用于自動化控制系統(tǒng)中。
渦街流量計是應(yīng)用流體振蕩原理來測量流量的，流體在管道中經(jīng)過渦街流量變送器時，在三角柱的旋渦發(fā)生體后上下交替產(chǎn)生正比于流速的兩列旋渦，旋渦的釋放頻率與流過旋渦發(fā)生體的流體平均速度及旋渦發(fā)生體特征寬度有關(guān)，可用下式表示：
式中:為旋渦的釋放頻率，單位為Hz；v為流過旋渦發(fā)生體的流體平均速度，單位為m/s；d為旋渦發(fā)生體特征寬度，單位為m；Sr為斯特勞哈爾數(shù)（Strouhal number），無量綱，它的數(shù)值范圍為0.14－0.27。
St是雷諾數(shù)的函數(shù)。
當(dāng)雷諾數(shù)Re在范圍內(nèi)，St值約為0.2。在測量中，要盡量滿足流體的雷諾數(shù)在，此時旋渦頻率。
由此，通過測量旋渦頻率就可以計算出流過旋渦發(fā)生體的流體平均速度v，再由式可以求出流量q，其中A為流體流過旋渦發(fā)生體的截面積。
72F50-SE0AA1AAA4AA德國進(jìn)口（非導(dǎo)電液體）E+H渦街流量計
