實驗室通風柜是實驗室操作人員重要的防護屏障,應選用氣流組織較好的實驗室通風柜。同樣的(de)通(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)(ju)排(pai)風(feng)(feng)(feng)(feng)(feng)量(liang),柜(ju)(ju)內(nei)氣(qi)流組織(zhi)差的(de)通(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)(ju),通(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)(ju)調(diao)(diao)節門(men)進風(feng)(feng)(feng)(feng)(feng)口面(mian)風(feng)(feng)(feng)(feng)(feng)速(su)(su)(su)不均(jun)(jun)勻,易(yi)泄漏(lou)有害(hai)(hai)氣(qi)體;柜(ju)(ju)內(nei)有渦流區,造(zao)成(cheng)(cheng)柜(ju)(ju)內(nei)有害(hai)(hai)氣(qi)體濃(nong)度(du)(du)積聚,排(pai)風(feng)(feng)(feng)(feng)(feng)效果不好,對操作(zuo)(zuo)人(ren)員安全(quan)造(zao)成(cheng)(cheng)威(wei)脅。設計較好的(de)實驗室(shi)通(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)(ju),在操作(zuo)(zuo)過(guo)(guo)程中,應保(bao)證通(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)(ju)調(diao)(diao)節門(men)從(cong)關閉到開啟度(du)(du)的(de)過(guo)(guo)程中,調(diao)(diao)節門(men)進風(feng)(feng)(feng)(feng)(feng)面(mian)風(feng)(feng)(feng)(feng)(feng)速(su)(su)(su)始(shi)終保(bao)持在0.5m/s±20%,并且(qie)面(mian)風(feng)(feng)(feng)(feng)(feng)速(su)(su)(su)均(jun)(jun)勻。實驗表明,面(mian)風(feng)(feng)(feng)(feng)(feng)速(su)(su)(su)過(guo)(guo)小,<0.3m/s,操作(zuo)(zuo)人(ren)員擾動易(yi)造(zao)成(cheng)(cheng)通(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)(ju)內(nei)有害(hai)(hai)氣(qi)體外溢(yi),對操作(zuo)(zuo)人(ren)員造(zao)成(cheng)(cheng)危害(hai)(hai)。通(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)(ju)調(diao)(diao)節門(men)進風(feng)(feng)(feng)(feng)(feng)面(mian)風(feng)(feng)(feng)(feng)(feng)速(su)(su)(su)過(guo)(guo)大,>0.8m/s,也易(yi)造(zao)成(cheng)(cheng)柜(ju)(ju)內(nei)有害(hai)(hai)氣(qi)體外溢(yi)。通(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)(ju)內(nei)排(pai)風(feng)(feng)(feng)(feng)(feng)氣(qi)流應均(jun)(jun)勻,減少渦流,避免有害(hai)(hai)氣(qi)體濃(nong)度(du)(du)積聚,及時排(pai)出(chu)有害(hai)(hai)氣(qi)體。通(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)(ju)的(de)形式、規格很多(duo),還有一些滿(man)足特殊(shu)要求的(de)通(tong)風(feng)(feng)(feng)(feng)(feng)柜(ju)(ju),如(ru)防(fang)爆型等(deng)。可根據實驗室(shi)具體要求選用(yong)。

實驗(yan)室通(tong)風柜通(tong)常(chang)配監(jian)控器。監(jian)控器主要功能包括:

(1)通(tong)風(feng)柜調節門進風(feng)面(mian)風(feng)速實時顯示。

(2)通(tong)風(feng)(feng)柜前有(you)人操(cao)作(zuo)、無(wu)人操(cao)作(zuo)模式(shi)控制(無(wu)人操(cao)作(zuo)時(shi)降低(di)風(feng)(feng)量,按60%風(feng)(feng)量運行(xing))。也可采用區域存在傳(chuan)感(gan)器(qi),自動探測通(tong)風(feng)(feng)柜前有(you)無(wu)操(cao)作(zuo)人員。

(3)緊急情(qing)況按鈕(有試劑泄(xie)漏等緊急情(qing)況時,加大通風柜(ju)排風量(liang))。