3000142220測量大口徑管道的液體流量時，選擇流量計要考慮以下因素：壓力損失應(yīng)越小越好；由于流速不高，管道內(nèi)壁易沉積污垢、淤泥；所以流量計的測量范圍要特別大，以適應(yīng)不同時間段的流量的懸殊差別；流量計的防護等級也要滿足所處環(huán)境的要求。
常用于測量大口徑管道液體流量的流量計有以下幾種：
1.電磁流量計
3000142220電磁流量計是根據(jù)法拉第電磁感應(yīng)定律制成的，被廣泛應(yīng)用于工業(yè)過程中各種導(dǎo)電液體的流量測量。
電磁流量計的主要特點如下：
①管道內(nèi)無可動部件，無阻流部件，測量中幾乎沒有附加壓力損失；
②測量結(jié)果與流速分布、流體壓力、密度、壓力、黏度等物理參數(shù)無關(guān)；
③測量精度高，測量范圍大；
④直管段要求相對較低，已與滿足；
⑤有大口徑及滿足防護要求的產(chǎn)品；
⑥大口徑產(chǎn)品的價格較高，且口徑越大價格增長越快。
2.超聲波流量計
3000142220超聲波流量計是利用聲波在靜止流體中的傳播速度與在流動流體中的傳播速度不同的原理制成的，既可以測量導(dǎo)電介質(zhì)，也可以測量非導(dǎo)電介質(zhì)的流量。
超聲波流量計的主要特點如下：
①探頭可以安裝在管道的外邊，不妨礙管道內(nèi)流體的流動狀況，以減小壓力損失；
②外夾式超聲波流量計的價格與管徑無關(guān)；
③測量精度與管道口徑有關(guān)，管徑越大有可能得到的精度越高（采用多聲段）。
3.插入式流量計
在測量精度要求不高的場合，可以采用插入式流量計來測量大流量。因為插入式的主要優(yōu)點是價格低，而且這種流量計的重量輕，壓損小也易于安裝和維修。
插入式流量計有兩種結(jié)構(gòu)形式，即點流速計型和徑流速計型。
I點流速計型傳感器
3000142220常見的有插入式渦街流量計、插入式渦輪流量計、插入式超聲筆流量計、插入式電磁流量計等。
A插入式渦街流量計——價格較低，但只適用于測量潔凈液體的流量，否則極易導(dǎo)致渦輪卡滯。
B插入式渦街流量計——耐臟性比插入式渦輪流量計好，測量精度一般，但可測流速的下限不能太低（測量水流量時，流速下限只能達到0.3m/s），否能將不能勝任。
C插入式超聲波流量計——不受溫度、壓力、密度和電導(dǎo)率變化的影響；傳感器結(jié)構(gòu)簡單，無節(jié)流體，不賭塞；安裝時不用停產(chǎn)斷電。
D插入式電磁流量計——低成本；3000142220無可動部件，與介質(zhì)接觸部分為不銹鋼材料，使用壽命長；安裝簡便，免維護；一種規(guī)格的傳感器可用于多種管道直徑，給選型和使用帶來許多方便。
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