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當前位置:首頁新聞資訊氣體變送器具有以下主要特性

氣體變送器具有以下主要特性

更新時間:2018-04-24點擊次數(shù):3724
   氣體變送器具有以下主要特性
  氣體變送器是指能將被測氣體的類別、濃度和成分轉換為與其成一定關系的電信號的裝置或器件,用來提供有關待測氣體的存在及其濃度大小的信息。氣體變送器是氣體檢測系統(tǒng)的核心,通常安裝在探測頭內,探測頭通過氣體變送器對氣體樣品進行調理,通常包括濾除雜質和干擾氣體、干燥或制冷處理、樣品抽吸,甚至對樣品進行化學處理,以便化學傳感器進行更快速的測量。
  氣體變送器主要用于工業(yè)上天然氣、煤氣、石油化工等部門的易燃、易爆、有毒、有害氣體的監(jiān)測、預報和自動控制。
  氣體變送器具有以下一些主要特性:
 ?、凫`敏度。靈敏度是指傳感器輸出變化量與被測輸入變化置之比,主要依賴于傳感器結構所使用的技術。大多數(shù)氣體變送器的設計原理都采用生物化學、電化學、物理和光學。首先要考慮的是選擇一種敏感技術,它對目標氣體的闊值限制或zui低爆炸限的百分比的檢測要有足夠的靈敏性。
  ②穩(wěn)定性。穩(wěn)定性是指傳感器在整個工作時間內響應的穩(wěn)定性,取決于零點摞移和區(qū)間漂移。零點漂移是指在沒有目標氣體時,整個工作時間內傳感器輸出響應的變化。區(qū)間漂移是指傳感器連續(xù)置于目標氣體中的輸出響應變化,表現(xiàn)為傳感器輸出信號在工作時間內的降低。理想情況下,一個傳感器在連續(xù)工作條件下,每年零點漂移小于10%。
 ?、劭垢g性??垢g性是指傳感器暴露于高體積分數(shù)目標氣體中的能力。在氣體大量泄漏時,探頭應能夠承受期望氣體體積分數(shù)1O~20倍。在返回正常工作條件下,傳感器漂移和零點校正值應盡可能小。
 ?、苓x擇性。選擇性也被稱為交叉靈敏度,可以通過測量由某一種濃度的干擾氣體所產(chǎn)生的傳感器響應采確定。這個響應等價于一定濃度的目標氣體所產(chǎn)生的傳感器響應。這種特性在追蹤多種氣體的應用中是非常重要的,理想傳感器應具有高靈敏度和高選擇性。

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