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class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UploadFile/cdwckj/637064087738046875/7186463.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="nh7cub7" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UploadFile/cdwckj/637064087738046875/7186463.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="poq3umo" class="content"><p><span>需求數量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>四川省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產品關鍵詞：</span>綿陽氣體檢測儀器供應</p><p><span>***更新：</span>2020-05-25 00:48:40</p><p><span id="click" >瀏覽次數：1次</span></p><a rel="nofollow" class="button">聯系我們</a></div></div><div id="zj2jlif" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">成都皖川科技有限公司</a></p><p><span>聯系人：</span>朱成生</p><p><span>郵箱: </span>cdwckjgs@sina.com</p><p><span>電話: </span>18755046999</p><p><span>傳真: </span>028_87463776</p><p><span>網址: </span></p><p><span>手機: </span>028-87463776</p><p><span>地址: </span>四川省成都市青羊區(qū)青羊萬達廣場SOHO公寓2-2-1138室</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="v3pm7qh" class="page-proshow02"><p class="title">詳細說明</p><div id="kzrtv3t" class="box"><p><p style="text-indent:25px">在氣體檢測儀上我們經?？吹缴厦鏄俗⒌挠小癙PM”、“LEL”，那么什么是“PPM”、“LEL”呢，也許很多人都不是太清楚，現在我們來詳細介紹這兩個詞的具體含義。 “PPM”是體積比濃度?！癙PM”是溶液濃度的一種表示方法， PPM 表示百萬分之一。對于溶液：即1升水溶液中有1/1000毫升的溶質，則其濃度為1 PPM 。對于氣體：對環(huán)境大氣中污染物濃度的表示方法之一。體積濃度表示法：一百萬體積的空氣中所含污染物的體積數，即PPM ，大部分氣體檢測儀器測得的氣體濃度都是體積濃度（ PPM ），而按我國規(guī)定，綿陽氣體檢測儀器供應，特別是環(huán)保部門，則要求氣體濃度以質量濃度的單位表示，綿陽氣體檢測儀器供應，綿陽氣體檢測儀器供應，我們國家的標準規(guī)范也都是采用質量濃度單位表示。它是利用一些金屬氧化物半導體材料，在一定溫度下，電導率隨著環(huán)境氣體成份的變化而變化的原理制造的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="綿陽氣體檢測儀器供應" src="http://tyunfile.71360.com/UploadFile/cdwckj/637064087738046875/7186463.jpg"></div><p style="text-indent:25px">“LEL"是指下限?？扇細怏w在空氣中遇明火種的比較低濃度，稱為下限—簡稱%LEL。可燃氣體在空氣中遇明火種的比較高濃度，稱為上限—簡稱%UEL。那么什么是下限呢？可燃性氣體的濃度過低或過高它是沒有危險的，它只有與空氣混合形成混合氣或更確切地說遇到氧氣形成一定比例的混合氣才會發(fā)生燃燒或。有關**部門和**已經對目前發(fā)現的可燃氣作了燃燒分析，制定出了可燃性氣體的極限，低于下限，混合氣中的可燃氣的含量不足，不能引起燃燒或，高于上限混合氣中的氧氣的含量不足，也不能引起燃燒或。另外，可燃氣的燃燒與還與氣體的壓力、溫度、點火能量等因素有關。極限一般用體積百分比濃度表示。極限是下限、上限的總稱，可燃氣體在空氣中的濃度只有在下限、上限之間才會發(fā)生。低于下限或高于上限都不會發(fā)生。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="綿陽氣體檢測儀器供應" src="http://tyunfile.71360.com/UploadFile/cdwckj/637064087739882813/2084410.jpg"></div><p style="text-indent:25px">氧氣作業(yè)：作業(yè)區(qū)域環(huán)境氧氣含量不得低于19.5%，有限空間內氧含量一般為 19.5%～21%，在富氧環(huán)境下不得大于23.5%。硫化氫作業(yè)：當硫化氫濃度低于40ppm時可以佩戴過濾式防毒面具作業(yè)，并在濾毒罐表面注明適用物質；　　當硫化氫濃度大于40ppm或濃度不明或二氧化硫濃度高于2ppm的區(qū)域內作業(yè)時應使用正壓式空氣呼吸器；　　嚴禁任何人不佩戴合適的防護用品進入可能含有硫化氫氣體的區(qū)域，禁止在有危險區(qū)域內摘除防毒用具。 6.如在作業(yè)中出現頭暈、耳鳴、眼花、惡心等情況時應立即停止作業(yè)，撤離到空氣清新區(qū)域（注意空氣流向，選擇上風口），如事態(tài)較大應立即啟動應急響應，開展自救、他救。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="綿陽氣體檢測儀器供應" src="http://tyunfile.71360.com/UploadFile/cdwckj/637064087737705079/5095940.jpg"></div></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/29516.html</p></div></div></div></div></div><div id="vpmtvcu" class="page-right twoColRt"><div id="8zl8pry" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="icewd8v" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強信息推薦自業(yè)物資供應</p></a></div><div id="v7a3gtq" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/846569.html"><div><img 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