德國SIEMENS西門子流量計7ML1028-4AA20

德國西門子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(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(yīng)，而接收換能器則是利用壓電效應(yīng)。
    西門子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(gòu)成換能器整體(又稱探頭)。聲楔的材料不僅要求強(qiáng)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(jī)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。

德國SIEMENS西門子流量計7ML1028-4AA20

西門子流量計7ML5034-2AA017ML5034-1AA017ML5034-3AA017ML1830-2AH 7MLs830-2AH7ML1034-1AA17ML1034-1AA27ML1034-1BA17ML1034-2AA17ML1034-2BA17ML1034-2AA117ML1034-2AA127ML1034-2BA117ML1034-1AA117ML1034-3AA117ML5034-2AA017ML5034-1AA017ML5034-3AA017ML1001-1AA01-0AA27ML1001-1BA01-0AA27ML1001-1AB01-0AA27ML1001-1AA01-0AB27ML1001-1BA01-0AB27ML1001-1AB01-0AB27ML1001-2AA01-0AA27ML1001-2BA01-0AA27ML1001-2AB01-0AA27ML1001-2AA01-0AB2德國SIEMENS流量計

    西門子流量計7ML1001-2BA01-0AB27ML1001-2AB01-0AB27ML1001-5AA01-0AA37ML1001-5BA01-0AA37ML1001-5AB01-0AA37ML1001-5AA01-0AB27ML1001-5BA01-0AB27ML1001-5AB01-0AB27ML1001-3AA01-0AA27ML1001-3AA01-0AB27ML5001-3AA01-0AA27ML5001-5AA01-0AA37ML1004-1AA10-1AB07ML1004-1AA10-1BB07ML1004-1AA10-2AB07ML1004-1AA10-2BB07ML1004-2AA10-1AB07ML1004-2AA10-1BB07ML12012EE00 7ML1201-2EE007ML12012AE007ML1201-2AE007ML12011EC107ML1201-1EC107ML12011ED107ML1201-1ED107ML12012EA107ML1201-2EA107ML12012AA107ML1201-2AA107ML12011EA107ML1201-1EA107ML5221-1BA117ML5221-1BA127ML5221-1BA217ML5221-1BA257ML5221-1DA117ML5221-1DA127ML5221-1DA217ML5221-1DA257ML5221-2DA117ML5221-2BA117ML5221-1AA117ML5221-1CA117ML5221-1AA127ML5221-1CA127ML5033-1BA00-1A7ML5033-1AA00-1A7ML5033-1BB00-1A7ML5033-1BA10-1A7ML5033-1BA00-1B7ML5033-1CA00-1A7ML5033-2BA10-1A7ML5033-2BA10-2A7ML1025-1BD017ML1025-1BD11