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href="http://www.cdcfah.com/cp/first-_dgdq/">電工電氣</a>?<a href="http://www.cdcfah.com/cp/second-dgdq_gydqew/">高壓電器</a>?<a href="http://www.cdcfah.com/cp/third-gydqew_gykggek/">高壓開關(guān)柜</a>?成都?xì)怏w檢測儀器供應(yīng) 客戶至上成都皖川科技供應(yīng)</p><div id="txw34xy" class="leftbox clearfix"><h1>成都?xì)怏w檢測儀器供應(yīng) 客戶至上成都皖川科技供應(yīng)</h1><div id="hqmd7q3" class="proBig"><div id="qyu84t7" class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UploadFile/cdwckj/637064087737705079/5095940.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="gy30n7l" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UploadFile/cdwckj/637064087737705079/5095940.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="wkabhvw" class="content"><p><span>需求數(shù)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(chǎn)品關(guān)鍵詞：</span>成都?xì)怏w檢測儀器供應(yīng)</p><p><span>最后更新：</span>2020-05-25 00:48:40</p><p><span id="click" >瀏覽次數(shù)：2次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="8cqmdza" 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(lián)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(wǎng)址: </span></p><p><span>手機(jī): </span>028-87463776</p><p><span>地址: </span>四川省成都市青羊區(qū)青羊萬達(dá)廣場SOHO公寓2-2-1138室</p><p>[當(dāng)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="jxtkl3p" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="es3j7xl" class="box"><p><p style="text-indent:25px">“LEL"是指爆炸下限?？扇?xì)怏w在空氣中遇明火種爆炸的比較低濃度，稱為爆炸下限—簡稱%LEL。可燃?xì)怏w在空氣中遇明火種爆炸的比較高濃度，稱為爆炸上限—簡稱%UEL。那么什么是爆炸下限呢？可燃性氣體的濃度過低或過高它是沒有危險的，成都?xì)怏w檢測儀器供應(yīng)，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)生燃燒或爆炸。有關(guān)權(quán)威部門和專家已經(jīng)對目前發(fā)現(xiàn)的可燃?xì)庾髁巳紵ǚ治?，制定出了可燃性氣體的爆炸極限，低于爆炸下限，混合氣中的可燃?xì)獾暮坎蛔?，不能引起燃燒或爆炸，高于上限混合氣中的氧氣的含量不足，也不能引起燃燒或爆炸，成都?xì)怏w檢測儀器供應(yīng)。另外，可燃?xì)獾娜紵c爆炸還與氣體的壓力、溫度、點(diǎn)火能量等因素有關(guān)。爆炸極限一般用體積百分比濃度表示。爆炸極限是爆炸下限、爆炸上限的總稱，成都?xì)怏w檢測儀器供應(yīng)，可燃?xì)怏w在空氣中的濃度只有在爆炸下限、爆炸上限之間才會發(fā)生爆炸。低于爆炸下限或高于爆炸上限都不會發(fā)生爆炸。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="成都?xì)怏w檢測儀器供應(yīng)" src="http://tyunfile.71360.com/UploadFile/cdwckj/637064087737705079/5095940.jpg"></div><p style="text-indent:25px">氣體檢測儀只能提供定性分析結(jié)果和較為粗略的定量分析數(shù)據(jù)，這種儀器所顯示的數(shù)據(jù)經(jīng)不起推敲，不能進(jìn)行誤差分析。(因只有分析數(shù)據(jù)偏離真值很小時才能談到“誤差”)，因此，不能作為準(zhǔn)確的分析數(shù)據(jù)確定(決定)重要工藝改進(jìn)調(diào)整的措施。但可作為定性檢測，如達(dá)到一定濃度時作出信號報警的依據(jù)。氣體檢測儀沒有設(shè)計樣氣工藝技術(shù)條件的調(diào)整及控制部分，同時它也不考慮樣氣存在的環(huán)境條件，直接進(jìn)行檢測。氣體檢測儀在應(yīng)用時，只需將儀器放置于被測氣氛內(nèi)，儀器即可顯示數(shù)值。氣體檢測儀是將傳感器直接置于大環(huán)境氣氛中測定的，儀器結(jié)構(gòu)設(shè)計及在實際使用檢測過程中并不考慮大環(huán)境氣氛中有無干擾測定的因素，并且不具備排除各種干擾因素的設(shè)計能力。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="成都?xì)怏w檢測儀器供應(yīng)" src="http://tyunfile.71360.com/UploadFile/cdwckj/637064087739882813/2084410.jpg"></div><p style="text-indent:25px">在氣體檢測儀上我們經(jīng)常看到上面標(biāo)注的有“PPM”、“LEL”，那么什么是“PPM”、“LEL”呢，也許很多人都不是太清楚，現(xiàn)在我們來詳細(xì)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(zhì)，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(shù)，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，特別是環(huán)保部門，則要求氣體濃度以質(zhì)量濃度的單位表示，我們國家的標(biāo)準(zhǔn)規(guī)范也都是采用質(zhì)量濃度單位表示。它是利用一些金屬氧化物半導(dǎo)體材料，在一定溫度下，電導(dǎo)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="成都?xì)怏w檢測儀器供應(yīng)" src="http://tyunfile.71360.com/UploadFile/cdwckj/637064087737402344/6678506.jpg"></div></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/29515.html</p></div></div></div></div></div><div id="qjkgcyb" class="page-right twoColRt"><div id="gjpwsoe" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="k3cm3k7" 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(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)</p></a></div><div 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