SIEMENS西門子超聲波流量計, SIEMENS管段式超聲波流量儀表是以“速度差法”為原理,測量圓管內液體流量的儀表。它采用了良好的多脈沖技術、信號數(shù)字化處理技術及糾錯技術,使流量儀表更能適應工業(yè)現(xiàn)場的環(huán)境,計量更方便、經(jīng)濟、準確。產(chǎn)品達到*水平,可廣泛應用于石油、化工、冶金、電力、給排水等領域。
超聲波流量計是通過檢測流體流動對超聲束(或超聲脈沖)的作用以測量流量的儀表。
原理
根據(jù)對信號檢測的原理超聲流量計可分為傳播速度差法(直接時差法、時差法、相位差法和頻差法)、波束偏移法、多普勒法、互相關法、空間濾法及噪聲法等。
SIEMENS超聲流量計和超聲波流量計一樣,因儀表流通通道未設置任何阻礙件,均屬*流量計,是適于解決流量測量困難問題的一類流量計,特別在大口徑流量測量方面有較突出的優(yōu)點,它是發(fā)展迅速的一類流量計之一。
SIEMENS超聲波流量計采用時差式測量原理:一個探頭發(fā)射信號穿過管壁、介質、另一側管壁后,被另一個探頭接收到,同時,第二個探頭同樣發(fā)射信號被*個探頭接收到,由于受到介質流速的影響,二者存在時間差Δt,根據(jù)推算可以得出流速V和時間差Δt之間的換算關系V=(C2/2L)×Δt,進而可以得到流量值Q.
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SIEMENS超聲波流量計北京經(jīng)銷
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SIEMENS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。
SIEMENS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,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)殡娔埽员銠z測。發(fā)射換能器利用壓電元件的逆壓電效應,而接收換能器則是利用壓電效應。
SIEMENS超聲波流量計換能器的壓電元件常做成圓形薄片,沿厚度振動。薄片直徑超過厚度的10倍,以保證振動的方向性。壓電元件材料多采用鋯鈦酸鉛。為固定壓電元件,使超聲波以合適的角度射入到流體中,需把元件故人聲楔中,構成換能器整體(又稱探頭)。聲楔的材料不僅要求強度高、耐老化,而且要求超聲波經(jīng)聲楔后能量損失小即透射系數(shù)接近1。常用的聲楔材料是有機玻璃,因為它透明,可以觀察到聲楔中壓電元件的組裝情況。另外,某些橡膠、塑料及膠木也可作聲楔材料。
SIEMENS超聲波流量計北京經(jīng)銷