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id="vf2gda8" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="uyacgx9" class="box"><p><p style="text-indent:25px">雷達(dá)物位計(jì)和射頻導(dǎo)納的區(qū)別：射頻導(dǎo)納開關(guān)發(fā)射一定的高頻無線電波作用于探頭上，以此分析和確定容器內(nèi)物位的變化。射頻導(dǎo)納開關(guān)對所探材料的不同，無線電波的頻率也隨之改變。射頻導(dǎo)納開關(guān)的探頭和容器壁構(gòu)成了一個(gè)間距固定的電容兩級，探頭的絕緣材料和周圍的空氣提供絕緣介質(zhì)?？諝獗黄渌橘|(zhì)所取代時(shí)，探頭與容器壁所構(gòu)成的電容量將改變，這一變化將引起作用于射頻導(dǎo)納開關(guān)探頭的無線電波的變化。這一變化被射頻導(dǎo)納開關(guān)內(nèi)部線路檢測到，與設(shè)置值比較，確定其改變量。當(dāng)與設(shè)置值相同時(shí)，輸出開關(guān)量信號，河北小麥倉物位計(jì)推薦。射頻導(dǎo)納是一種從電容式發(fā)展起來的，河北小麥倉物位計(jì)推薦，河北小麥倉物位計(jì)推薦、防掛料、更可靠、更準(zhǔn)確、適用性更廣的新型物位控制技術(shù)。河北小麥倉物位計(jì)推薦</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河北小麥倉物位計(jì)推薦,物位計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/xalunqian/637333662049042969/9305017.png"></div><p> 一體式超聲波物位計(jì)的概述： </p> <p> 聲波頻率超過20kHz的聲波稱為超聲波，超聲波是機(jī)械波的一種，即是機(jī)械振動在彈性介質(zhì)中的一種傳播過程，它的特征是頻率高、波長短、繞射現(xiàn)象小，另外方向性好，能夠成為射線而定向傳播。超聲波在液體、固體中衰減很小，因而穿透能力強(qiáng)，尤其是在對光不透明的固體中，超聲波可穿透幾十米的長度，碰到雜質(zhì)或界面就會有明顯的反射。有超聲波在介質(zhì)中傳播原理可知，若介質(zhì)壓力、溫度、密度、濕度等條件一定，則超聲波在該介質(zhì)中傳播速度是一個(gè)常數(shù)。因此，當(dāng)測出超聲波由發(fā)射到遇到液面反射被接收所需要的時(shí)間，則可換算出超聲波通過的路程，即得到了液位的數(shù)據(jù)。 </p> <p> <br /> 河北小麥倉物位計(jì)推薦傳感器是26G高頻雷達(dá)式物位測量儀表，測量最大距離可達(dá)70米。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河北小麥倉物位計(jì)推薦,物位計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/xalunqian/637333661375087891/15454.png"></div><p> 一體式超聲波物位計(jì)的選擇 </p> <p> 接線形式的選擇 </p> <p> 兩線制：兩線制超聲波物位計(jì)其供電（*DC24V）與信號輸出（DC4-20mA）共用一個(gè)回路，*使用兩條線即可，為標(biāo)準(zhǔn)的變送器形式。 </p> <p> 三線制：三線制超聲波物位計(jì)實(shí)際上為四線制，其供電（*DC24V）與信號輸出（DC4-20mA）回路分離，各使用兩條線，當(dāng)它們負(fù)端共地相連時(shí)，通常使用三條線即可。其優(yōu)勢是發(fā)射功率較大。 </p> <p> 四線制：供電（DC24V或AC220V）與信號輸出（DC4-20mA）回路分離，使用兩條線，其優(yōu)勢是發(fā)射功率較大，同時(shí)提供高、低位繼電器輸出，增加了新功能。 </p><p> 雷達(dá)物位計(jì)產(chǎn)品特點(diǎn) </p> <p> 1、適應(yīng)性強(qiáng)：被測物料不同的介電常數(shù)，密度對測量均不產(chǎn)生影響。結(jié)垢，攪動，湍流，氣泡，振動，中等粘度，高溫，高壓等惡劣天劍對測量也無影響。 </p> <p> 2、免于維護(hù)：由于音叉限位開關(guān)的檢測過程由電子電路完成，無活動部件，所以一經(jīng)安裝投運(yùn)便不需要維護(hù)。 </p> <p> 3、不需要調(diào)校：由于音叉限位開關(guān)的檢測不受被測介質(zhì)電參數(shù)及密度的影響，所以無論測量何種液體都不需要現(xiàn)場調(diào)校。 </p> <p> 發(fā)射功率很低的極短的微波通過天線系統(tǒng)發(fā)射并接收。雷達(dá)波以光速運(yùn)行。運(yùn)行時(shí)間可以通過電子部件被轉(zhuǎn)換成物位信號。一種特殊的時(shí)間延伸方法可以確保極短時(shí)間內(nèi)穩(wěn)定和精確的測量。即使存在虛假反射的時(shí)候，微處理技術(shù)和軟件也可以準(zhǔn)確地分析出物位回波。通過輸入容器尺寸，可以將上空距離值轉(zhuǎn)換成與物位成正比的信號。儀表可以空倉調(diào)試。在固體測量中的應(yīng)用可以使用K-頻段的高頻傳感器。由于信號的聚焦效果非常好，料倉內(nèi)的安裝物或倉壁的粘附物都不會影響測量。一體式超聲波物位計(jì)，實(shí)現(xiàn)了全數(shù)字化，人性化設(shè)計(jì)理念，具有完善的物/液位測控·數(shù)據(jù)傳輸和人機(jī)交流功能。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河北小麥倉物位計(jì)推薦,物位計(jì)" src="https://tyunfile.71360.com/WaterMark/UploadFile/xalunqian/637333661851611328/5177133.png"></div><p> 射頻電容物位計(jì)可以解決大多數(shù)高溫，高壓，腐蝕性液位的測量。它采用美國公司射頻電容技術(shù)和芯片及聚四氟乙烯做絕緣材料。與雙法蘭液位計(jì)，浮筒式液位計(jì)，同位素式液位計(jì)相比，它是一種簡單，耐用，方便的儀表。 </p> <p> 特點(diǎn):<span style="display:none;"></span>結(jié)構(gòu)簡單，安裝容易。耐腐蝕性強(qiáng)，用聚四氟乙烯做探桿。耐高溫，一般為200℃，特殊可達(dá)到1000℃。耐高壓，zui高壓為32MPa。 <p> 原理用途： </p> <p> 如果將探桿和容器壁視做兩塊相互平行的電極板，被測液體視做它們之間的介質(zhì)，那么一個(gè)簡單的電容形成了。當(dāng)液位上升時(shí)，電容量就會增加，射頻電路將這一變化轉(zhuǎn)換為模擬信號輸出。酸類，堿類，氯化物，有機(jī)溶劑，液態(tài)CO2，氨水，PVC粉料，灰料，油水界面，中藥等液**測量。 </p> 雷達(dá)物位計(jì)采用非接觸式測量方法。目前較成熟的非接觸測量技術(shù)有超聲波、核輻射和微波。河北小麥倉物位計(jì)推薦</p><p style="text-indent:25px">物位計(jì)可廣應(yīng)用于各行業(yè)中液體及固體料倉物位的連續(xù)測量。河北小麥倉物位計(jì)推薦</p><p> 導(dǎo)波雷達(dá)物位計(jì)，采用了可發(fā)出高頻率微波，沿著探桿傳播，由于遇到被測介質(zhì)，介電常數(shù)突變，引起反射。發(fā)射脈沖與反射脈沖的時(shí)間間隔與被測量介質(zhì)的距離成正比。特殊的時(shí)間延伸方法可以確保極短時(shí)間內(nèi)穩(wěn)定和精確的測量。即使存在虛假反射的時(shí)候，的微處理技術(shù)和軟件也可以準(zhǔn)確地分析出物位回波，儀表可以空倉調(diào)試。在固體測量中的應(yīng)用可以使用K-頻段的高頻傳感器。由于信號的聚焦效果非常好，料倉內(nèi)的安裝物或倉壁的粘附物都不會影響測量。 </p> <p> 工作原理:導(dǎo)波雷達(dá)物位計(jì)是基于時(shí)間行程原理的測量儀表，雷達(dá)波以光速運(yùn)行，運(yùn)行時(shí)間可以通過電子部件被轉(zhuǎn)換成物位信號。探頭發(fā)出高頻脈沖并沿纜繩傳播，當(dāng)脈沖遇到物料表面時(shí)反射回來被儀表內(nèi)的jieshouiqi接收，并將距離信號轉(zhuǎn)化為物位信號。 </p> <p> 反射的脈沖信號沿纜式或桿式探頭傳導(dǎo)至儀表電子線路部分，微處理器對此信號進(jìn)行處理，識別出微波脈沖在物料表面所產(chǎn)生的回波。河北小麥倉物位計(jì)推薦</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2743457.html</p></div></div></div></div></div><div id="vubdfmg" class="page-right twoColRt"><div id="7by82ol" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="8df3xwf" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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