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技術文章

德國E+H電磁流量計產品性能產品直銷

點擊次數:828 發布時間:2015-7-27

德國E+H電磁流量計產品性能

Endress Hauser(恩德斯豪斯,簡稱E H公司)創建于1953年,是一家世界的性自動化儀表集團公司,E H測量及自動化儀表廣泛應用于世界各地的各種工業領域,為了幫助用戶獲取佳的過程控制結果,Endress Hauser開發和制造了各種高技術水準的測量和控制儀表,改善和提高了化工、石油及天然氣、制藥、能源、源水和污水、食品、散料處理、紙漿及造紙、造船和海上運輸等領域的過程效益。同時可提供適用于在危險區域,衛生型場合,過溢保護和其它特殊應用場合使用的認證證書。


E+H電磁流量計的工作原理
     電磁流量計測量原理依據于法拉第電磁感應定律。流量計測量管是一內襯絕緣材料的非導磁合金導管。兩只電極與軸流方向垂直穿透關閉固定在測量管上,其電極頭與襯里內表面基于平齊。當勵磁線圈由雙向發生方波脈沖勵磁時,即在與測量管軸線垂直方向上產生一磁能量密度為 B 的工作磁場。此時,如果具有一定電導率的流體流經測量管,將切割磁力線感應出電動勢 E。電動勢 E 正比于磁通量密度 B,測量管內徑與平均流速 V的乘積。電動勢 E(流量信號)由電極檢出并通過電纜送至轉換器。  
 
電磁流量計工作原理產品性能
其數學表達式為:  Q=3600 E 式中: Q-  被測液體流量,m3/h;B-磁感應強度,T;d-電極間距,m;E-被測液體的感應電動勢,V 。 轉換器采用智能化設計方式,使得流量計具有功耗低、零點穩定、度高、性能可靠和功能齊全等特點。轉換器向傳感器提供勵磁驅動,用于產生穩定的脈沖交變磁場,流經流量計的導電流體在傳感器的檢測電極上產生一差分信號,輸入至轉換器的高阻抗輸入放大器,在單片計算機的同步控制下,經信號放大、濾波、增益控制及零點修正、信號采樣等環節,獲得所需的流量信號,運算后變換為各種相應流量值,現場顯示或遠傳輸出。

 

E+H電磁流量計的優點
E+H電磁流量計的測量通道是一段無阻流檢測件的光滑直管,因不易阻塞適用于測量含有固體顆粒或纖維的液固二相流體,如紙漿、煤水漿、礦漿、泥漿和污水等。不產生因檢測流量所形成的壓力損失,儀表的阻力僅是同一長度管道的沿程阻力,節能效果顯著,對于要求低阻力損失的大管徑供水管道zui為適合。E+H電磁流量計所測得的體積流量,實際上不受流體密度、粘度、溫度、壓力和電導率(只要在某閾值以上)變化的影響。與其他大部分流量儀表相比,前置直管段要求較低。E+H電磁流量計測量范圍度大,通常為20∶1~50∶1,可選流量范圍寬。滿度值液體流速可在0.5~10m/s內選定。有些型號儀表可在現場根據需要擴大和縮小流量(例如設有4位數電位器設定儀表常數),不必取下作離線實流標定。E+H電磁流量計的口徑范圍比其他品種流量儀表寬,從幾毫米到3m。可測正反雙向流量,也可測脈動流量,只要脈動頻率低于激磁頻率很多。儀表輸出本質上是線性的。易于選擇與流體接觸件的材料品種,可應用于腐蝕性流體。

 

E+H電磁流量計的安裝請注意以下幾點: 

 ·安裝不需要特殊的固定支架,儀表的容器型結構能克服外力的影響,如第二容室結構·測量管振動頻率高,確保測量不受管道振動的影響。
    ·只要不產生氣蝕現象,測量不受閥門、彎通、三通等管件的影響。
    ·為保護管道,建議當傳感器過重時,采取適當的支架支撐。 測量管內夾帶氣泡時,會產生測量誤差,
    應避免以下安裝位置:
    ·流量計安裝在管道的zui高點,會造成空氣積聚
    ·流量計直接安裝在向下的放空管道出口處 系統壓力 應確保不產生氣蝕現象,因為氣蝕現象會影響測量管的振動。正常條件下測量與水特性相似的流體時不需要采取特殊措施。 液體沸點低(碳氫化合物、溶劑、液化氣)或者在吸入式管道上時,系統應有足夠高的壓力。確保壓力不低于蒸汽壓,即液體不會沸騰。確保液體不產生氣化。
    因此,傳感器的*安裝位置為: · 泵的下游(避免真空)· 垂直管道的zui低點處 安裝方向 垂直安裝 建議使流體流向朝上,可使夾帶的固體顆粒下沉,氣體經測量管上升。 測量管內流體可全部排空而避免固體沉積。
    水平安裝 正確的安裝是變送器的外殼豎直向上或向下 ,使測量管(單管系統)內無氣體和固體雜質積聚。 請勿將傳感器懸空安裝在管道上,要用支架固定。以免過程連接處承受過度的拉力。傳感器安裝底板用于在平板、靠墻或者立柱安裝。

 

德國E+H電磁流量計現貨型號:
德國E+H電磁流量計*型號:
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