恒溫恒濕試驗箱是(shi)集合了高溫、低溫、濕熱(re)為一(yi)(yi)體(ti)的試(shi)驗箱，它的修理難度(du)較(jiao)其它環境試(shi)驗設備大，且具(ju)有代(dai)表(biao)性(xing)。下面就(jiu)恒溫恒濕試(shi)驗箱為例，談(tan)(tan)一(yi)(yi)談(tan)(tan)構造及(ji)一(yi)(yi)些常見故障和(he)排(pai)除方法(fa)。
恒溫(wen)恒濕(shi)(shi)(shi)試驗箱由箱體、風(feng)循環(huan)系(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)、制(zhi)(zhi)冷系(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)、加(jia)(jia)熱系(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)和(he)(he)控濕(shi)(shi)(shi)系(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)組成。風(feng)循環(huan)系(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)一般(ban)采(cai)用(yong)(yong)(yong)可調節送風(feng)方(fang)(fang)向的(de)結(jie)構(gou)；加(jia)(jia)濕(shi)(shi)(shi)系(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)有采(cai)用(yong)(yong)(yong)鍋爐(lu)加(jia)(jia)濕(shi)(shi)(shi)和(he)(he)表面(mian)蒸發二種；降溫(wen)、除濕(shi)(shi)(shi)系(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)采(cai)用(yong)(yong)(yong)空調工況制(zhi)(zhi)冷結(jie)構(gou)；加(jia)(jia)熱系(xi)(xi)統(tong)(tong)(tong)(tong)(tong)(tong)采(cai)用(yong)(yong)(yong)電(dian)熱鰭片加(jia)(jia)熱和(he)(he)電(dian)爐(lu)絲直(zhi)接加(jia)(jia)熱二種結(jie)構(gou)；溫(wen)濕(shi)(shi)(shi)度(du)測(ce)(ce)試方(fang)(fang)法(fa)采(cai)用(yong)(yong)(yong)干濕(shi)(shi)(shi)球測(ce)(ce)試方(fang)(fang)法(fa)，也有用(yong)(yong)(yong)濕(shi)(shi)(shi)度(du)傳感器(qi)直(zhi)接測(ce)(ce)量(liang)方(fang)(fang)法(fa)；控制(zhi)(zhi)和(he)(he)顯示操作界面(mian)采(cai)用(yong)(yong)(yong)溫(wen)濕(shi)(shi)(shi)度(du)分開獨(du)立和(he)(he)溫(wen)濕(shi)(shi)(shi)度(du)組合控制(zhi)(zhi)器(qi)等方(fang)(fang)式。
恒溫恒濕試(shi)驗箱的一(yi)(yi)些常(chang)見(jian)故(gu)障和排除方法，在高(gao)溫試(shi)驗中，如(ru)溫度(du)變化達不到試(shi)驗溫度(du)值時(shi)，可以檢查(cha)(cha)電器系(xi)統(tong)，逐一(yi)(yi)排除故(gu)障。如(ru)溫度(du)升(sheng)得很慢，就要查(cha)(cha)看風循(xun)環(huan)系(xi)統(tong)，看一(yi)(yi)下風循(xun)環(huan)的調節擋(dang)板是否開啟(qi)正(zheng)常(chang)，反之(zhi)，就檢查(cha)(cha)風循(xun)環(huan)的電機運轉(zhuan)是否正(zheng)常(chang)。如(ru)溫度(du)過沖厲害(hai)那么(me)就需(xu)要整定PID的設置參數。如(ru)果溫度(du)直(zhi)接上升(sheng)，過溫保護(hu)，那么(me)，控制器出(chu)故(gu)障，須更換(huan)控制儀表。
低(di)溫(wen)(wen)(wen)(wen)達不(bu)到(dao)試(shi)(shi)驗(yan)(yan)的(de)(de)指標，那就(jiu)(jiu)要(yao)(yao)觀察溫(wen)(wen)(wen)(wen)度(du)的(de)(de)變化(hua)，是(shi)(shi)(shi)溫(wen)(wen)(wen)(wen)度(du)降的(de)(de)很(hen)慢，還是(shi)(shi)(shi)溫(wen)(wen)(wen)(wen)度(du)到(dao)一定(ding)值后溫(wen)(wen)(wen)(wen)度(du)有(you)回升的(de)(de)趨(qu)勢，前者就(jiu)(jiu)要(yao)(yao)檢查一下，做(zuo)低(di)溫(wen)(wen)(wen)(wen)試(shi)(shi)驗(yan)(yan)前是(shi)(shi)(shi)否將工(gong)作室(shi)烘(hong)干，使工(gong)作室(shi)保(bao)持干燥(zao)后再(zai)將試(shi)(shi)驗(yan)(yan)樣品放(fang)入工(gong)作室(shi)內再(zai)做(zuo)試(shi)(shi)驗(yan)(yan)，工(gong)作室(shi)內的(de)(de)試(shi)(shi)驗(yan)(yan)樣品是(shi)(shi)(shi)否放(fang)置的(de)(de)過多，使工(gong)作室(shi)內的(de)(de)風不(bu)能充分循環(huan)(huan)，在排(pai)除上述原因(yin)后，就(jiu)(jiu)要(yao)(yao)考慮是(shi)(shi)(shi)否是(shi)(shi)(shi)制(zhi)冷(leng)系統中(zhong)的(de)(de)故障了(le)，轉子泵(beng)這樣就(jiu)(jiu)要(yao)(yao)請廠家(jia)的(de)(de)專業人(ren)員進行檢修。后者的(de)(de)現(xian)象是(shi)(shi)(shi)設(she)備(bei)的(de)(de)使用環(huan)(huan)境不(bu)好所致，設(she)備(bei)放(fang)置的(de)(de)環(huan)(huan)境溫(wen)(wen)(wen)(wen)度(du)，放(fang)置的(de)(de)位置(箱體(ti)后與墻(qiang)的(de)(de)距離)要(yao)(yao)滿(man)足(zu)要(yao)(yao)求(在設(she)備(bei)操作使用說明中(zhong)都有(you)規定(ding))。
在做濕(shi)(shi)熱試驗中(zhong)(zhong)，出現(xian)(xian)實(shi)際濕(shi)(shi)度(du)會(hui)(hui)達到100%或者(zhe)實(shi)際濕(shi)(shi)度(du)與目標濕(shi)(shi)度(du)相差很大(da)，數值(zhi)低得很多，前(qian)者(zhe)的(de)(de)現(xian)(xian)象(xiang)(xiang)：可(ke)能是(shi)濕(shi)(shi)球(qiu)傳感(gan)器(qi)(qi)上(shang)的(de)(de)紗布(bu)(bu)干燥引起，那(nei)就要(yao)(yao)檢查濕(shi)(shi)球(qiu)傳感(gan)器(qi)(qi)的(de)(de)水(shui)(shui)(shui)槽(cao)中(zhong)(zhong)是(shi)否缺水(shui)(shui)(shui)，水(shui)(shui)(shui)槽(cao)中(zhong)(zhong)的(de)(de)水(shui)(shui)(shui)位(wei)(wei)(wei)是(shi)由(you)一(yi)(yi)(yi)水(shui)(shui)(shui)位(wei)(wei)(wei)控制器(qi)(qi)自動控制的(de)(de)，查水(shui)(shui)(shui)位(wei)(wei)(wei)控制器(qi)(qi)供水(shui)(shui)(shui)系(xi)(xi)統是(shi)否供水(shui)(shui)(shui)正(zheng)(zheng)常(chang)，水(shui)(shui)(shui)位(wei)(wei)(wei)控制器(qi)(qi)工(gong)作(zuo)(zuo)是(shi)否正(zheng)(zheng)常(chang)。另一(yi)(yi)(yi)種可(ke)能就是(shi)濕(shi)(shi)球(qiu)紗布(bu)(bu)因(yin)(yin)使(shi)用時間長，或供水(shui)(shui)(shui)水(shui)(shui)(shui)質純凈度(du)的(de)(de)原因(yin)(yin)，會(hui)(hui)使(shi)紗布(bu)(bu)變硬，使(shi)紗布(bu)(bu)無法吸收水(shui)(shui)(shui)份(fen)而干燥，只(zhi)要(yao)(yao)更換或清洗紗布(bu)(bu)即(ji)可(ke)排除以上(shang)現(xian)(xian)象(xiang)(xiang)。后者(zhe)的(de)(de)現(xian)(xian)象(xiang)(xiang)主(zhu)要(yao)(yao)是(shi)加濕(shi)(shi)系(xi)(xi)統不工(gong)作(zuo)(zuo)，查看(kan)加濕(shi)(shi)系(xi)(xi)統的(de)(de)供水(shui)(shui)(shui)系(xi)(xi)統，供水(shui)(shui)(shui)系(xi)(xi)統內是(shi)否有(you)一(yi)(yi)(yi)定的(de)(de)水(shui)(shui)(shui)量(liang)，控制加濕(shi)(shi)鍋爐水(shui)(shui)(shui)位(wei)(wei)(wei)的(de)(de)水(shui)(shui)(shui)位(wei)(wei)(wei)控制是(shi)否正(zheng)(zheng)常(chang)，加濕(shi)(shi)鍋爐內的(de)(de)水(shui)(shui)(shui)位(wei)(wei)(wei)是(shi)否正(zheng)(zheng)常(chang)。如以上(shang)一(yi)(yi)(yi)切都正(zheng)(zheng)常(chang)，那(nei)就要(yao)(yao)檢查電器(qi)(qi)控制系(xi)(xi)統，這要(yao)(yao)請專業維修人員進(jin)行檢修。
設(she)備(bei)在試(shi)驗運(yun)行過程中突然出(chu)現(xian)(xian)故(gu)障(zhang)(zhang)時，控制儀(yi)表上出(chu)現(xian)(xian)對(dui)應的(de)故(gu)障(zhang)(zhang)顯示提示并有(you)聲訊報警提示。操(cao)作人員(yuan)可以(yi)對(dui)照設(she)備(bei)的(de)操(cao)作使用(yong)中的(de)故(gu)障(zhang)(zhang)排(pai)除一章中快速檢查出(chu)屬于哪一類故(gu)障(zhang)(zhang)，即可請專業(ye)人員(yuan)快速排(pai)除故(gu)障(zhang)(zhang)，以(yi)確保試(shi)驗的(de)正常進行。其它(ta)環境試(shi)驗設(she)備(bei)在使用(yong)中還會有(you)其它(ta)的(de)現(xian)(xian)象，那就要具體現(xian)(xian)象，具體分析和排(pai)除。
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