恩德斯豪斯E+H流量計

電磁流量計工作原理是：基于法拉第電磁感應(yīng)定律。流量計的測量管是一內(nèi)襯絕緣材料的非導(dǎo)磁合金短管。兩只電極沿管徑方向穿通管壁固定在測量管上。其電極頭與襯里內(nèi)表面基本齊平。勵磁線圈由雙方波脈沖勵磁時，將在與測量管軸線垂直的方向上產(chǎn)生一磁通量密度為B的工作磁場。此時，如果具有一定電導(dǎo)率的流體流經(jīng)測量管。將切割磁力線感應(yīng)出電動勢E。電動勢E正比于磁通量密度B，測量管內(nèi)徑d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(zhuǎn)換器。轉(zhuǎn)化器將流量信號放大處理后，可顯示流體流量，并能輸出脈沖，模擬電流等信號，用于流量的控制和調(diào)節(jié)。E=KBdv式中：E---------------為電極間的信號電壓（v）B-----------------磁通密度（T）d------------------測量管內(nèi)徑（m）v------------------平均流速（m/s）式中k, d為常數(shù)，由于勵磁電流是恒流的，故B也是常數(shù)，則由E=KBdv可知，體積流量Q與信號電壓E-成正比，即流速感應(yīng)的信號電壓E與體積Q成線性關(guān)系。因此，只要測量出E就可確定流量Q，這是電磁流量計的基本工作原理。由E=KBdv可知，被測流量體介質(zhì)的溫度、密度、壓力、電導(dǎo)率、液固兩兩相流體介質(zhì)的液固成分比等參數(shù)不會影響測量結(jié)果。至于流動狀態(tài)只要符合軸對稱流動（如層流或者紊流）就不會影響測量結(jié)果的。因此說電磁流量計是一中真正的體積流量計。對于制造商和用戶來說，只要用普通的水實(shí)際標(biāo)定后就可以測量其他任何導(dǎo)電流體介質(zhì)的體積流量，而不需要任何修正。這是電磁流量計的一突出優(yōu)點(diǎn)，是其他任何流量計所沒有的。測量管內(nèi)無活動及阻流部件，因此幾乎沒有壓力損失，并且有較高的可靠性

恩德斯豪斯E+H流量計

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 E+H 80F40-AAASAABABAAA 唐玙昺

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上海穎哲工業(yè)自動化設(shè)備有限公司
上海市黃浦區(qū)北京東路668號上?？萍季┏菛|樓20C2

1、準(zhǔn)確度等級
流量計在規(guī)定的流量范圍內(nèi)準(zhǔn)確度等級、zui大允許誤差應(yīng)符合表1的規(guī)定。流量計誤差表示使用相對示值誤差。
2、引用誤差 　　
對于用于瞬時流量指示的流量計誤差表示也可使用引用誤差，其zui大允許誤差系列應(yīng)符合表1規(guī)定，其檢定結(jié)果的標(biāo)書中不再給出準(zhǔn)確等級，而使用其zui大允許誤差表示，且還應(yīng)在zui大允許誤差后標(biāo)注FS，如±0.5%FS。 　　
3、誤差表示方法和選取原則 　　
在一臺流量計的一次檢定中，應(yīng)按照準(zhǔn)確度等級和引用誤差之中的一種給出流量計誤差表示方法；對于使用相對示值誤差和引用誤差組合表示誤差的流量計，一次檢定中也應(yīng)統(tǒng)一使用一種方法表示其誤差。 　　
4、重復(fù)性 　　
流量計的重復(fù)性不得超過相應(yīng)準(zhǔn)確度等級規(guī)定的zui大允許誤差值的1/3。

適用于衛(wèi)生、食品、飲料或過程應(yīng)用的流量測量
 產(chǎn)品應(yīng)用 ：E+H電磁流量計
可用于測量電導(dǎo)率≥50μS/cm的液體流量：
•飲料，例如：果汁，啤酒或葡萄酒

•鮮奶制造

•化學(xué)水處理（酸、堿、鹽）

公稱直徑：DN 0-100
 3A認(rèn)證和EHEDG測試
•簡單的測量電流輸出用于顯示流量，脈沖輸出用于驅(qū)動外部累加器或作為狀態(tài)輸出
 
•Promag10能夠確保所有基本功能的可靠性，安全性和測量值的穩(wěn)定性
 
•優(yōu)化的過程控制精度為+0.5%
 
•PTFE襯里確保zui大的抗腐蝕性而且耐溫高達(dá)130℃
 
•在絕大多數(shù)的困難條件下都可進(jìn)行裝配（例如:軸，震動或長期處于水下），傳感器可不帶傳感器獨(dú)立安裝，且保護(hù)等級為IP68
 
•功能化設(shè)計使得維護(hù)工作簡單易行，HART、Fieldtool和FieldCheck對設(shè)備的核查提供支持，從而不需要移動傳感器