R021KK3112交錯排列的旋渦
由于d和St是常數(shù)，而流速v與管內(nèi)平均流速v0有固定關系(v0=v/(1-1.25d/D))，測得旋渦分離頻率f就測得管內(nèi)平均流速v0，從而測得體積流量。一段時間內(nèi)分離旋渦的個數(shù)N與流過流體的體積V之比(單位體積對應的旋渦數(shù))稱為儀表系數(shù)K：
R021KK3112 系列渦街流量計采用裝設于柱體后面的壓電探頭檢測旋渦分離頻率。FA80M流量傳感器輸出與流量成比例的電壓脈沖頻率信號，F(xiàn)A80T流量變送器輸出的是變換成與流量成比例的4-20mA標準電流信號。
流量計選型
渦街流量計的選型正確與否，將直接影響到儀表能否正常運行，因此設計單位和用戶應首先做好以下準備工作，以保證選型合理、正確：
確認儀表用途，一般分為流量控制、一般計量或用于貿(mào)易結(jié)算；
2. 確定在管道上的具體安裝位置，找出可能影響儀表正常工作的環(huán)境因素；
3. 認真核對測量流體的工藝參數(shù)如：壓力、溫度、粘度、流量范圍等。
主要技術指標
1公稱口徑(mm)
滿管式：DN15、20、25、<span style="FONT-FAMILY: Arial; FONT-SIZ
特點：
熱響應時間少，減小動態(tài)誤差；
可彎曲安裝使用；
測量范圍大；
機械強度高，耐壓性能好；
工作原理：
熱電偶的電極由兩根不同導體材質(zhì)組成。當測量端與參比端存在溫差時，就會產(chǎn)生熱電勢，工作儀表便顯示熱電勢所對應的溫度值。
技術參數(shù)：
產(chǎn)品執(zhí)行標準：IEC584 IEC1515 JB/T5582-91
GB/T16839-1997
常溫絕緣電阻:
熱電偶在環(huán)境溫度為20±15℃，相對濕度不大于80%，試驗電壓為500±50V（直流）電極與外套管之間的絕緣電阻≥ 1000MΩ.m。
即: 1M長的試樣的絕緣電阻為1000 MΩ；
10M長的試樣的絕緣電阻為100 MΩ；
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