欧美无人区码卡二卡3卡2024_PID光離子化檢測儀紫外燈的選擇有什么意義？-青島路博建業(yè)環(huán)?？萍加邢薰?/title> <META NAME="Keywords" CONTENT="PID光離子化檢測儀"> <META NAME="Description" CONTENT="PID光離子化檢測儀紫外燈的選擇有什么意義？"> <link href="/Skins/410118/css/style.css" rel="stylesheet" type="text/css"> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body> <h1><a href="http://xiwind.cn/">国产在线观看成永久视频_无码日韩精品免费区_欧美日韩在线免费观看网址你懂的_深夜福利在线观看日本_精品黄色视频在线免费看_欧美日韩国产①区在线_欧美日韩综合一区_最新2021厕所偷拍精品视频_亚洲黄色特级视频_成人午夜电影福利免费</a></h1><h1><a href="http://xiwind.cn/">国产在线观看成永久视频_无码日韩精品免费区_欧美日韩在线免费观看网址你懂的_深夜福利在线观看日本_精品黄色视频在线免费看_欧美日韩国产①区在线_欧美日韩综合一区_最新2021厕所偷拍精品视频_亚洲黄色特级视频_成人午夜电影福利免费</a></h1><div id="r9tbh" class="pl_css_ganrao" style="display: none;"><track id="r9tbh"></track><font id="r9tbh"><big id="r9tbh"><acronym id="r9tbh"><b id="r9tbh"></b></acronym></big></font><output id="r9tbh"></output><acronym 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<span>技術(shù)文章</span></div><div id="f9rdfrffl7j" class="mup_right"><a href="/">首頁(yè)</a> > <a href="/article.html">技術(shù)文章</a> > PID光離子化檢測儀紫外燈的選擇有什么意義？</div></div> <h1 class="tittle">PID光離子化檢測儀紫外燈的選擇有什么意義？</h1> <div id="f9rdfrffl7j" class="wz_time">更新日期：2021-02-03 瀏覽次數：1337 </div> <div id="f9rdfrffl7j" class="nr"><div>　　PID光離子化檢測儀使用一個(gè)高能量的紫外燈提供離子化的能量，該能量取決于它所產(chǎn)生的紫外光的能量?？梢愿鶕鶛z測化合物的不同使用不同的紫外燈。光離子化過(guò)程如下：<br /> </div><div>　　RH + hu ? RH+ + e-<br /> </div><div>　　量子hu代表等于或大于RH(待測分子)的能量。一般講，分子越小，它的結合能就越大，IP也就越高。而較大的分子，或具有雙鍵、三鍵的分子，IP值較低。被離子化的組份被離子腔收集產(chǎn)生電流，而電流正比于濃度。<br /> </div><div>　　紫外燈發(fā)出的能量決定了它所能檢測的化合物的種類(lèi)?，F在可以選擇的能量有9.5, 9.8, 10.0, 10.2, 10.6, 11.7 和 11.8 eV(隨制造商不同)。大多數的產(chǎn)品允許在同一臺儀器上使用不同能量的紫外燈。所選擇的燈的能量越低、可能檢測的化合物種類(lèi)就越少。反之亦然。<br /> </div><div>　　燈的能量越高，它所受到的物理限制也就越多。通常，燈的能量越高，它的壽命就越短。PID燈是由一個(gè)充滿(mǎn)低壓?jiǎn)我粴怏w或混合氣體(氧氣、氮氣、氫氣或氪氣)的玻璃泡構成。通過(guò)電流和輻射波使這些氣體激發(fā)產(chǎn)生紫外光，光束通過(guò)一個(gè)窗出。較高能量的燈(11.7eV和11.8eV)的窗口材料是由氟化鋰制成的，它很容易吸收水分和被燈自己發(fā)出的紫外光照射而衰變。因此，高能量燈的壽命比較短。在一般操作下可以使用1或2個(gè)月。另外，盡管高能量燈發(fā)出的能量會(huì )使更多的物質(zhì)離子化，但它產(chǎn)生的光通量卻要比低能量燈少，這就意味著(zhù)高能量燈的離子化電流比較低也容易產(chǎn)生漂移。<br /> </div><div>　　通過(guò)選擇燈的能量也可能改變選擇性，比如，9.8eV燈的能量輸出已足夠于檢測苯(IP為9.24eV)，但對于很多其它物質(zhì)的離子化就不足，也就是無(wú)法檢測到。需要注意的是，9.8eV燈窗口材料(氟化鈣，或者夾有氟化鈣的三明治結構)的壽命較短，正常操作下可以持續6個(gè)月。<br /> </div><div>　　10.6eV燈的窗口(氟化鎂)既不會(huì )吸收水蒸氣也不會(huì )被紫外線(xiàn)損壞，因此10.6 eV 燈的壽命就長(cháng)一些，在一般操作下可以連續使用1-2年，同時(shí)，10.6eV燈的能量也足以檢測大多數的VOC，這樣10.6eV燈的使用也就廣泛得多。<br /> </div><div>　　PID儀器是非特性的，儀器的讀數是所有可檢測物質(zhì)的信號之和。同時(shí)，由于離子電位和其它物理性質(zhì)的不同，相同濃度的其它氣體可能產(chǎn)生的讀數不同。這樣，PID的讀數總是跟校準氣體有關(guān)。校正是建立在對于一個(gè)已知濃度的已知氣體相應的離子電流的基礎上。其它氣體的儀器響應是和它們本身的性質(zhì)有關(guān)的，一個(gè)10ppm的讀數表明儀器產(chǎn)生了一個(gè)與10ppm校正氣體相同的離子電流。其它氣體得到這個(gè)讀數的實(shí)際濃度可能多于也可能少于這個(gè)值。<br /> </div><div>　　由于PID讀數總是和校正氣體有關(guān)，因此這個(gè)讀數應當表述為與校正氣體相關(guān)的ppm單位，或者PID單位，而不要使用實(shí)際的濃度值，除非檢測的污染物同校正氣體一樣，或者儀器的讀數已經(jīng)得到校正。大多數的儀器制造商會(huì )提供一個(gè)表格，或者在儀器中存儲一個(gè)數據庫來(lái)校正讀數。更為*設計則是允許用戶(hù)存儲一系列的曲線(xiàn)，然后調出來(lái)得到待測物質(zhì)的實(shí)際濃度。<br /> </div><div>　　需要強調的是，使用各類(lèi)校正系數時(shí)也要遵循制造商的建議。在實(shí)際應用中，校正系數可能受到環(huán)境條件，比如溫度和濕度的影響。尤其是濕度。盡管水蒸氣(IP為12.59eV)不能被PID燈離子化，但水蒸氣可以在離子化腔中反射、散射和吸收紫外線(xiàn)，因此，水蒸氣對于低濃度的污染物讀數還是會(huì )有阻礙。非離子化的蒸氣(那些IP值大于燈能量的污染物)，比如甲烷，也可能像水蒸氣那樣散射紫外光，從而降低檢測器的靈敏度。對于某些PID設計，甚至高濃度的氧氣也會(huì )對測定靈敏度有影響?；旧险f(shuō)，離子化腔和電流收集板間的距離越短，散射和降低的可能性越小，因此這種影響同檢測器的設計有很大的關(guān)系。<br /> </div><div>　　采樣進(jìn)到檢測腔中的灰塵和顆粒同樣會(huì )降低檢測器的靈敏度，同樣，沉積在窗口上的顆粒也可能減少燈對樣品的輻射，水蒸氣或其它較熱的氣體和蒸氣在窗口上的冷凝也有同樣的影響。因此，有些制造商建議在每次使用前對燈進(jìn)行清洗。清洗的頻度同通過(guò)檢測腔的氣流有很大的關(guān)系，在“軸向”氣流設計中，氣流直接射向燈的表面，可能會(huì )增加污染物沉積的機會(huì )，而“切向”氣流設計則是氣流平行通過(guò)燈的表面，就可能減少這種影響,也大大減少了清洗的頻度。<br /> </div><div>　　不論何種設計，在顯示某些癥狀時(shí)，檢測器和燈還是需要清洗。這些癥狀包括：零點(diǎn)漂移、靈敏度降低明顯等等。定期對傳感器進(jìn)行清洗會(huì )清除沉積，恢復燈的靈敏度。清洗時(shí)要十分小心不要碰壞燈的窗口，否則就需要及時(shí)更換。<br /> </div><div>　　過(guò)去，光離子檢測器給人的印象是笨重、不穩定和價(jià)格昂貴，這大大限制了它們在密閉空間進(jìn)入中的使用。在過(guò)去的幾年中，這些已經(jīng)有了巨大的改進(jìn)，小型化的光離子檢測器已經(jīng)應用于越來(lái)越多的環(huán)境應急事故、危險化學(xué)品儲運、化學(xué)武器監測、公共衛生安全等等檢測之中，PID檢測已經(jīng)成為某些行業(yè)規范。</div></div> <div id="f9rdfrffl7j" class="dcont"></div> <div class="f9rdfrffl7j" id="news_sx"> <li id="f9rdfrffl7j" class="sx_left">上一篇：<a href="/Article-2544625.html">在線(xiàn)水質(zhì)采樣器的工作原理是怎樣的</a><br />下一篇：<a href="/Article-2537976.html">測溫儀人工智能測溫檢測系統產(chǎn)品特性</a></li> <li id="f9rdfrffl7j" class="sx_right"><a href="/article.html">返回</a></li> </div> 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