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上架時(shí)間： 2017-02-28
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概述

　　智能插管式流量計是在清華大學(xué)、天津大學(xué)技術(shù)基礎上開(kāi)發(fā)設計的一種新型智能流量計，其前身是我公司的防爆插管（探針）式流量?jì)x表。

　　鐵嶺鐵光儀器儀表有限責任公司先后與清華大學(xué)、天津大學(xué)合作，共同開(kāi)發(fā)設計出了智能插管式流量計即防爆插管（探針）式流量?jì)x表，經(jīng)過(guò)十幾年在廣泛的工業(yè)領(lǐng)域中應用，不斷總結和完善了智能插管式流量計的測量理論和成熟經(jīng)驗。使得智能插管式流量計在很多方面優(yōu)于其它流量計。

工作原理

　　智能插管式流量計是根據國際標準ISO3966《封閉管道中流體流量的測量-采用皮托靜壓管的速度面積法》設計的一種點(diǎn)流速型的差壓式流量計。

　　利用傳感器測量管道中心流體的總壓與靜壓之差來(lái)測量流速。將傳感器插入管道中心，迎面測壓孔測量的是總壓，與總壓管相連通，引出總壓信號，背面測壓孔測量的是靜壓，與靜壓管相通，引出靜壓信號，兩個(gè)壓力信號分別與差壓變送器“+”“-”端相通，輸出差壓信號，同時(shí)熱電阻溫度計測得流體溫度，與壓力信號、差壓信號及流量系數等一同輸入智能積算儀或DCS系統中進(jìn)行運算后，顯示相關(guān)數據。

特點(diǎn)

1、具有防堵特點(diǎn)：智能插管式流量計的傳感器采用了子彈頭型(測量較潔凈的介質(zhì))和S形靠背管（測量有雜質(zhì)的介質(zhì)）兩種形式。子彈頭形式是根據美國威里斯公司推出的彈頭形端面檢測桿設計的。因為有固定且平緩的兩個(gè)拐點(diǎn)，使得流量系數的穩定性更好，彈頭形端面的高壓測孔因其彈頭的前部較寬闊，形成靜止的高壓區，將阻止流體中的固體塵粒進(jìn)入，其防堵性能均優(yōu)于其他截面的檢測桿。S形靠背管其探頭前部形成高壓區，在高壓區處形成不規則旋流，粉塵受自身重力作用自然下落，阻止了顆粒進(jìn)入。這兩種形式從原理上解決了傳感器堵塞的問(wèn)題。

2、耐高溫高壓：由于傳感器材料一般采用0Cr18Ni9不銹鋼（也可根據不同流體選用其他材料），可耐高溫650℃，耐壓32MPa。

3、可靠性高：由于傳感器的結構設計合理、簡(jiǎn)單，導壓管內介質(zhì)不流動(dòng)，雜質(zhì)不容易進(jìn)去，所以能長(cháng)時(shí)間保持測量精度。

4、安裝方便：只需在管道合適的位置（直管段來(lái)流方向70%處），開(kāi)一個(gè)適當的孔，把傳感器的頭部插到管道中心即可，對有些工況還可實(shí)現帶壓在線(xiàn)安裝。

5、維修簡(jiǎn)單：傳感器本身無(wú)需維護，只需按計量器具定期檢定要求，對差壓變送器進(jìn)行零點(diǎn)和滿(mǎn)度校驗，以及二次表輸入相應的電流進(jìn)行檢驗即可，還可實(shí)現在線(xiàn)疏通、在線(xiàn)清洗。

6、測量范圍廣：可測量各種氣體、蒸汽及滿(mǎn)管的液體；可解決超小管徑和超大管徑、低流速、小流量等難以測量的問(wèn)題；可實(shí)現圓形、方形、長(cháng)方形、菱形、梯形、橢圓形、三角形等各種形狀管道的測量。

7、節能：由于傳感器的簡(jiǎn)單結構，其截面積很小，在流體管道中幾乎無(wú)壓力損失，運行成本大大減少，與孔板流量計相比，具有明顯的節能效果，經(jīng)過(guò)計算，智能插管式流量計與孔板流量計的能耗比約為1.2：100。

8、直管段要求：彎管后≥2D。若不滿(mǎn)足此條件智能插管式流量計可根據現場(chǎng)管段長(cháng)度進(jìn)行現場(chǎng)實(shí)標，保證測量的準確度。

9、實(shí)現了出廠(chǎng)前對智能插管式流量計逐臺標定。

10、智能插管式流量計精確度高，重復性及穩定性好。

PTB-S型系列

　　PTB-S型智能插管式流量計是采用S型靠背管，利用皮托管原理設計的一種實(shí)用新型專(zhuān)利產(chǎn)品。它在冶金、電力、石油、化工等行業(yè)得到廣泛應用。含有雜質(zhì)的流動(dòng)介質(zhì)均可選擇PTB-S型皮托巴流量計進(jìn)行測量，如電力行業(yè)中的一次風(fēng)量、二次風(fēng)量，化工行業(yè)中的各種物料氣體，冶金行業(yè)中的各種煤氣等。

其具有以下特點(diǎn)：

1、探頭部分采用S型皮托管結構，其后部采用近直式，內置反擊塞結構，取壓孔直徑大，防堵塞并利于疏通，設置積塵罐結構便于雜質(zhì)積聚清除。

2、每臺流量計均經(jīng)高精度標準風(fēng)洞檢定。

3、管道上開(kāi)適當的孔，焊法蘭安裝，安裝方便，不泄漏，可采用一體式或分體式結構。

4、差壓變送器、壓力變送器、溫度變送器可選用隔爆型，現場(chǎng)防爆。

5、可與計算機或DCS系統兼容。

6、采用多參量變送器，可實(shí)現現場(chǎng)顯示。

8、測量準確度：液體準確度最高可達±0.2%，氣體準確度最高可達±1%。

9、測量管徑可大9000mm。

10、工作壓力0~32MPa。

11、介質(zhì)溫度可達650℃。

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