SIEMENS流量計(jì)東莞*出售的詳細(xì)資料：

    德國西門子股份公司創(chuàng)立于1847年，是電子電氣工程領(lǐng)域的企業(yè)。西門子自1872年進(jìn)入中國，140余年來以創(chuàng)新的技術(shù)、的解決方案和產(chǎn)品堅(jiān)持不懈地對中國的發(fā)展提供全面支持，并以出眾的品質(zhì)和令人信賴的可靠性、的技術(shù)成就、不懈的創(chuàng)新追求，確立了在中國市場的地位。2015年（2014年10月1日至2015年9月30日），西門子在中國的總營業(yè)收入達(dá)到69.4億歐元，擁有超過32000名員工。西門子已經(jīng)發(fā)展成為中國社會和經(jīng)濟(jì)不可分割的一部分，并竭誠與中國攜手合作，共同致力于實(shí)現(xiàn)可持續(xù)發(fā)展。SIEMENS流量計(jì)東莞*出售
    西門子超聲流量計(jì)和超聲波流量計(jì)一樣，因儀表流通通道未設(shè)置任何阻礙件，均屬*流量計(jì)，是適于解決流量測量困難問題的一類流量計(jì)，特別在大口徑流量測量方面有較突出的優(yōu)點(diǎn)，它是發(fā)展迅速的一類流量計(jì)之一。
    西門子超聲波流量計(jì)采用時(shí)差式測量原理：一個(gè)探頭發(fā)射信號穿過管壁、介質(zhì)、另一側(cè)管壁后，被另一個(gè)探頭接收到，同時(shí)，第二個(gè)探頭同樣發(fā)射信號被*個(gè)探頭接收到，由于受到介質(zhì)流速的影響，二者存在時(shí)間差Δt，根據(jù)推算可以得出流速V和時(shí)間差Δt之間的換算關(guān)系V=(C2/2L)×Δt，進(jìn)而可以得到流量值Q
    2 優(yōu)缺點(diǎn)
    優(yōu)點(diǎn)
    西門子超聲波流量計(jì)是一種非接觸式儀表，它既可以測量大管徑的介質(zhì)流量也可以用于不易接觸和觀察的介質(zhì)的測量。它的測量準(zhǔn)確度很高，幾乎不受被測介質(zhì)的各種參數(shù)的干擾，尤其可以解決其它儀表不能的強(qiáng)腐蝕性、非導(dǎo)電性、放射性及易燃易爆介質(zhì)的流量測量問題。
    缺點(diǎn)
    現(xiàn)今所存在的缺點(diǎn)主要是可測流體的溫度范圍受超聲波換能鋁及換能器與管道之間的耦合材料耐溫程度的限制，以及高溫下被測流體傳聲速度的原始數(shù)據(jù)不全。目前我國只能用于測量200℃以下的流體。另外，超聲波流量計(jì)的測量線路比一般流量計(jì)復(fù)雜。這是因?yàn)椋话愎I(yè)計(jì)量中液體的流速常常是每秒幾米，而聲波在液體中的傳播速度約為1500m/s左右，被測流體流速(流量)變化帶給聲速的變化量zui大也是10－3數(shù)量級．若要求測量流速的準(zhǔn)確度為1%，則對聲速的測量準(zhǔn)確度需為10-5～10-6數(shù)量級，因此必須有完善的測量線路才能實(shí)現(xiàn)，這也正是超聲波流量計(jì)只有在集成電路技術(shù)迅速發(fā)展的前題下才能得到實(shí)際應(yīng)用的原因。
    SIEMENS流量計(jì)東莞*出售
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