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style="width:90%; padding: 10px; line-height:2; background-color:#FFFFFF;"> <h1 style="padding-bottom:20px;color:#009688; text-align:center; font-size:20px;font-family:'Microsoft YaHei'; clear:both; font-weight:bold;">深圳市公司直供安泰AT-300型燃?xì)鈭缶?/h1> 可燃?xì)怏w報警器原理<br>可燃?xì)怏w報警器由檢測和聲光報警器兩部分組成，可燃?xì)怏w報警器檢測部分的原理是儀器的傳感器選用檢測元件與固定電阻和調(diào)零電壓器構(gòu)成檢測橋路。橋路以鉑絲為載體催化元件，通電后鉑絲溫度上升至作業(yè)溫度，空氣以天然分散方法或其它方法抵達元件外表。當(dāng)空氣中無可燃?xì)怏w時，橋路輸出為零，當(dāng)空氣含有可燃?xì)庑詺怏w并分散到檢測元件上時，因為催化作用發(fā)作的無焰焚燒，使檢測元件溫度上升，鉑絲電阻增大，使橋路失去平衡，然后有一電壓信號輸出，這個電壓的巨細(xì)與可燃?xì)怏w的濃度成正比，信號經(jīng)擴大，模數(shù)轉(zhuǎn)換，聲光報警器的原理是當(dāng)被檢測可燃性氣體濃度超越限定值時，經(jīng)過擴大的橋路輸出電壓與電路電路勘探設(shè)置電壓，經(jīng)過電壓比較器，方波宣布輸出一組防波信號，操控聲光勘探電路，蜂鳴器發(fā)作接連聲音，發(fā)光二極管閃耀，宣布勘探類型。<br>1.1.2該可燃?xì)怏w報警器具有以下特色：<br>1）選用高活絡(luò)氣體傳感器，抗中毒好，抗干擾能力強；<br>2）主動零點歸位，活絡(luò)度校準(zhǔn)，主動曲線補償；<br>3）毛病主動監(jiān)測；<br>4）過量程限流維護、反極性維護；<br>5）節(jié)能、功耗小、帶負(fù)載能力強；<br>6）輸出4~20ma規(guī)范信號；<br>1.2燃?xì)鈭缶鞑倏仄?br>1）聲光報警信號能手動消除，再次有報警信號輸入時仍能宣布報警；<br>2）電源電壓發(fā)作+—10%變化時，指示報警精度不得下降；<br>3）報警操控器應(yīng)具有聯(lián)動維護用的開關(guān)量輸出功用；<br>4）報警操控器應(yīng)具有響度獨立、互不影響的報警功用；<br>1.2.2電動切斷閥<br>1）閥體的而定電壓、作業(yè)溫度、耐腐蝕性和原料，不該低于對燃?xì)夤芫€原料的要求；<br>2）閥體原料，一般狀況可選用鑄鋼或鍛鋼。有特別要求時，可選用不銹鑄鋼、不銹鍛鋼或其它特別原料；<br>3）電動切斷閥的功率和報警操控器繼電器輸出功率相匹配；<br>4）一般狀況下宜選用聚四氟乙烯填充<br>2.1可燃?xì)怏w報警器裝置注意事項：<br>1）當(dāng)檢測比空氣輕的燃?xì)猓ㄈ斯夂吞烊粴獾龋r，檢測報警器與燃?xì)饩哐b置高度應(yīng)距棚頂0.3米左右，切不得設(shè)在燃?xì)饩哒戏剑?br>2）當(dāng)檢測比空氣重的燃?xì)猓ㄒ夯蜌夂鸵夯突旌蠚獾龋r，檢測報警器裝置高度應(yīng)距地上0.3米左右;<br>3)燃?xì)鉂舛葯z測報警器的報警濃度應(yīng)按照國家現(xiàn)行規(guī)范規(guī)則。距檢測報警器1米處的聲壓級不得低于70db.<br>2.2切斷閥裝置事項：<br>1）切斷閥應(yīng)設(shè)在用氣場的燃?xì)膺M口管、干管或總管上；<br>2）切斷閥前應(yīng)設(shè)手動切斷閥；<br>3）切斷閥應(yīng)選用主動封閉、現(xiàn)場人工開啟型，當(dāng)濃度到達設(shè)定值時，主動封閉切斷閥；<br> 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