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<p><span>1.槽式流量計(jì)</span></p><p><span><br/></span></p><p><span>原理：將水道某處縮成一個(gè)狹窄部分(咽喉),并在此處增加流速,此時(shí),水位產(chǎn)生與流量成正比的變化。用液面計(jì)即可求出流量。為提高性能,可對(duì)其形狀進(jìn)行改進(jìn)。如P-B槽、巴歇爾槽、無(wú)喉道槽等。它們各有其理論公式及實(shí)驗(yàn)公式,通過(guò)計(jì)算累計(jì)出流量。優(yōu)點(diǎn)：此流量計(jì)要比溢流計(jì)能測(cè)量更大的流量,并能就地做成,有較高的流速、流動(dòng)。亦可用于懸浮物質(zhì)高或含中等較小的固體物,并不作周期性清除的液體。</span></p><p><span><br/></span></p><p><span>缺點(diǎn):要比溢流計(jì)價(jià)格高,需要就地做標(biāo)定</span></p><p><span><br/></span></p><p><span>2. 電磁流量計(jì)</span></p><p><span><br/></span></p><p><span>原理：根據(jù)電磁感應(yīng)定律,當(dāng)導(dǎo)體橫切磁場(chǎng)移動(dòng)時(shí),在導(dǎo)體中感應(yīng)出與速度成正比的電壓。按這一定律求出流體流速,進(jìn)而得出流量。</span></p><p><span><br/></span></p><p><span>特點(diǎn)：</span></p><p><span><br/></span></p><p><span>1. 傳感器(測(cè)量管)內(nèi)無(wú)活動(dòng)管,無(wú)壓力損失。</span></p><p><span><br/></span></p><p><span>2.只要液體具有一定的導(dǎo)電性,就可不受溫度、壓力、密度等條件的影響,測(cè)量出液體流量。</span></p><p><span><br/></span></p><p><span>3.用于滿管流體測(cè)量。適用范圍主要適用于工業(yè)生產(chǎn)中具有一定的導(dǎo)電性的液體輸送,為滿管道傳輸流量的測(cè)量。亦可用于明渠,但安裝時(shí)要采取一些措施。</span></p><p><span><br/></span></p><p><span>缺點(diǎn)：由于測(cè)量管中要始終充滿液體,因此,不大適用于污水排放測(cè)量。近年來(lái),也有明渠污水排放流量測(cè)量的實(shí)例,但容易堵塞。而且,測(cè)量管內(nèi)雖無(wú)壓力損失,但整體明渠(或非滿管管道)上總的壓力損失較大。</span></p><p><span><br/></span></p><p><span>3.多普勒超聲波流量計(jì)</span></p><p><span><br/></span></p><p><span>目前在污水排放口安裝很普遍的一款，適用于各類(lèi)明渠，河道，非滿管管道。</span></p><p><br/></p> </div> <div id="popra85" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-3270022.html">關(guān)于水質(zhì)在線分析儀常見(jiàn)問(wèn)題</a></li> <li>下一篇：<a href="/Article-3266423.html">紅外分光測(cè)油儀原理及使用步驟</a></li> </ul> </div> </div>   <div id="popra85" class="ly_foot"> <div id="popra85" class="ly_Ftmain"> <div id="popra85" class="ly_FtLeft"> <div id="popra85" 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