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id="submenu_德國(guó)WTW水質(zhì)分析儀" style="display:none"> <ul class="two_profl"> <li><a href="/SonList-1157181.html">PH電極</a></li> </ul> </div> </li> </ul> </div> </div> <div id="xv9a494" class="nymiddlezty"> <div id="nbxaugj" class="mianbao">您現(xiàn)在的位置：<a href="/">首頁</a> > <a href="/article.html">技術(shù)文章</a> > 氣體檢測(cè)儀防爆等級(jí)術(shù)語和標(biāo)準(zhǔn)</div> <div id="d3oeoic" class="about_con"> <h1 class="newstit">氣體檢測(cè)儀防爆等級(jí)術(shù)語和標(biāo)準(zhǔn)</h1> <div id="f8ojsug" class="newstime"> <span id="apalprl" class="skim"><em>瀏覽次數(shù)：</em>3724</span><span id="xcxilxz" class="skimtim"><em>發(fā)布日期：</em>2012-06-09 </span> </div> <p> </p><p><strong>氣體檢測(cè)儀防爆等級(jí)術(shù)語和標(biāo)準(zhǔn)</strong></p><p><br />將工廠或礦區(qū)的爆炸危險(xiǎn)介質(zhì)，按其引燃能量，小點(diǎn)燃溫度以及現(xiàn)場(chǎng)爆炸性危險(xiǎn)氣體存在的時(shí)間周期進(jìn)行科學(xué)分類分級(jí)，以確定現(xiàn)場(chǎng)防爆設(shè)備的防爆標(biāo)志和防爆形式。</p><p><strong>防爆標(biāo)志格式：</strong></p><p>Ex :防爆標(biāo)記<br />（ia）: 防爆等級(jí)<br />ⅡC :氣體組別<br />T4 :溫度組別</p><p><br /><strong>防爆等級(jí)：</strong></p><p>隔爆型 “d" 增安型 "e" 本質(zhì)安全型 "i" 正壓型 "P" 充油型 "O" 充砂型 "q" 無火花型 “n" 澆封型 "m" 氣密型 “m" 特殊型 "s" 粉塵防爆型 "DIP"<br />ia等級(jí)：<br />在正常工作、一個(gè)故障和二個(gè)故障時(shí)均不能點(diǎn)燃爆炸性氣體混合物的電氣設(shè)備。<br />正常工作時(shí)，安全系數(shù)為2.0；<br />一個(gè)故障時(shí)，安全系數(shù)為1.5；<br />二個(gè)故障時(shí)，安全系數(shù)為1.0。<br />正常工作時(shí)，有火花的觸點(diǎn)須加隔爆外殼、氣密外殼或加倍提高安全系數(shù)。<br />ib等級(jí)：<br />在正常工作和一個(gè)故障時(shí)不能點(diǎn)燃爆炸性氣體混合物的電氣設(shè)備。<br />正常工作時(shí)，安全系數(shù)為2.0；<br />一個(gè)故障時(shí)，安全系數(shù)為1.5。<br />正常工作時(shí)，有火花的觸點(diǎn)須加隔爆外殼或氣密外殼保護(hù)，并且有故障自顯示的措施。</p><p>電氣設(shè)備類型 <br />I類------煤礦井下用電氣設(shè)備 <br />II類-----工廠用電氣設(shè)備</p><p><strong>防爆等級(jí)</strong></p><p><br />防爆熱電偶的防爆等級(jí)按其使用于爆炸性氣體混合物大安全間隙分為A B C三級(jí)。</p><p><strong>氣體組別</strong></p><p><br />大試驗(yàn)安全間隙（MESG）mm<br />II A 0.9≤MESG</p><p>B 0.5<MESG<0.9</p><p>C MESG≤0.5</p><p><br /><strong>溫度組別</strong><br />防爆熱電偶的溫度組別按其外露部分允許高面溫度分為T1-T6。允許高表面溫度 ℃<br />T1 450<br />T2 300<br />T3 200<br />T4 135<br />T5 100<br />T6 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