德國西門子超聲波流量計* 西門子超聲波流量計正確選型才能保證西門子超聲波流量計更好的使用。選用什么種類的西門子超聲波流量計應(yīng)根據(jù)被測流體介質(zhì)的物理性質(zhì)和化學(xué)性質(zhì)來決定?使西門子超聲波流量計的通徑、流量范圍、襯里材料、電極材料和輸出電流等都能適應(yīng)被測流體的性質(zhì)和流量測量的要求。
西門子超聲波流量計由超聲波換能器、電子線路及流量顯示和累積系統(tǒng)三部分組成。超聲波發(fā)射換能器將電能轉(zhuǎn)換為超聲波能量，并將其發(fā)射到被測流體中，接收器接收到的超聲波信號，經(jīng)電子線路放大并轉(zhuǎn)換為代表流量的電信號供給顯示和積算儀表進行顯示和積算。這樣就實現(xiàn)了流量的檢測和顯示。
西門子超聲波流量計常用壓電換能器。它利用壓電材料的壓電效應(yīng)，采用適出的發(fā)射電路把電能加到發(fā)射換能器的壓電元件上，使其產(chǎn)生超聲波振勸。超聲波以某一角度射入流體中傳播，然后由接收換能器接收，并經(jīng)壓電元件變?yōu)殡娔?，以便檢測。發(fā)射換能器利用壓電元件的逆壓電效應(yīng)，而接收換能器則是利用壓電效應(yīng)。
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德國西門子超聲波流量計*
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