一(yi)、恒溫(wen)恒濕(shi)(shi)試驗箱的(de)構造(zao)由箱體、風循(xun)環系(xi)統(tong)、制(zhi)冷系(xi)統(tong)、加(jia)(jia)熱(re)系(xi)統(tong)和(he)(he)控濕(shi)(shi)系(xi)統(tong)組成。風循(xun)環系(xi)統(tong)一(yi)般采(cai)用(yong)(yong)(yong)可調(diao)節送風方(fang)向的(de)結構;加(jia)(jia)濕(shi)(shi)系(xi)統(tong)有(you)采(cai)用(yong)(yong)(yong)鍋(guo)爐加(jia)(jia)濕(shi)(shi)和(he)(he)表面蒸發(fa)二種;降溫(wen)、除濕(shi)(shi)系(xi)統(tong)采(cai)用(yong)(yong)(yong)空調(diao)工況制(zhi)冷結構;加(jia)(jia)熱(re)系(xi)統(tong)采(cai)用(yong)(yong)(yong)電熱(re)鰭片加(jia)(jia)熱(re)和(he)(he)電爐絲(si)直接加(jia)(jia)熱(re)二種結構;溫(wen)濕(shi)(shi)度(du)(du)測(ce)試方(fang)法(fa)(fa)采(cai)用(yong)(yong)(yong)干濕(shi)(shi)球測(ce)試方(fang)法(fa)(fa)，也有(you)用(yong)(yong)(yong)濕(shi)(shi)度(du)(du)傳感器直接測(ce)量方(fang)法(fa)(fa);控制(zhi)和(he)(he)顯示操作界面采(cai)用(yong)(yong)(yong)溫(wen)濕(shi)(shi)度(du)(du)分開獨立和(he)(he)溫(wen)濕(shi)(shi)度(du)(du)組合(he)控制(zhi)器等方(fang)式(shi)。
二、恒溫(wen)恒濕試(shi)驗(yan)箱(xiang)的一(yi)些常見故障和排除(chu)方法
◆高(gao)低溫(wen)交(jiao)變(bian)濕(shi)熱試驗(yan)(yan)(yan)箱(xiang)在高(gao)溫(wen)試驗(yan)(yan)(yan)中，如(ru)溫(wen)度(du)(du)變(bian)化達不到試驗(yan)(yan)(yan)溫(wen)度(du)(du)值時，可以檢查電器系統(tong)(tong)，逐一(yi)排(pai)除故(gu)(gu)障。如(ru)溫(wen)度(du)(du)升得很慢，就(jiu)要查看風(feng)循環(huan)系統(tong)(tong)，看一(yi)下風(feng)循環(huan)的調節擋板是否(fou)(fou)開啟(qi)正常(chang)，反之，就(jiu)檢查風(feng)循環(huan)的電機運轉是否(fou)(fou)正常(chang)。如(ru)溫(wen)度(du)(du)過沖厲害那么就(jiu)需要整定PID的設置參(can)數。如(ru)果溫(wen)度(du)(du)直接(jie)上升，過溫(wen)保護(hu)，那么，控制器出故(gu)(gu)障，須更換控制儀表(biao)。
◆恒溫(wen)(wen)恒濕試(shi)驗箱(xiang)低(di)溫(wen)(wen)達不到試(shi)驗的(de)(de)(de)(de)指標，那(nei)你就(jiu)要(yao)觀察(cha)溫(wen)(wen)度(du)的(de)(de)(de)(de)變化(hua)，是溫(wen)(wen)度(du)降的(de)(de)(de)(de)很慢，還是溫(wen)(wen)度(du)到一定(ding)值后溫(wen)(wen)度(du)有回升的(de)(de)(de)(de)趨勢，前者就(jiu)要(yao)檢查一下，做低(di)溫(wen)(wen)試(shi)驗前是否(fou)將工(gong)(gong)作(zuo)室(shi)(shi)烘(hong)干，使(shi)工(gong)(gong)作(zuo)室(shi)(shi)保(bao)持干燥后再將試(shi)驗樣品放(fang)(fang)入工(gong)(gong)作(zuo)室(shi)(shi)內再做試(shi)驗，工(gong)(gong)作(zuo)室(shi)(shi)內的(de)(de)(de)(de)試(shi)驗樣品是否(fou)放(fang)(fang)置的(de)(de)(de)(de)過多，使(shi)工(gong)(gong)作(zuo)室(shi)(shi)內的(de)(de)(de)(de)風不能(neng)充分(fen)循環(huan)，在排除(chu)上(shang)述原因后，就(jiu)要(yao)考慮是否(fou)是制冷系統中(zhong)的(de)(de)(de)(de)故障了，轉(zhuan)子泵這樣就(jiu)要(yao)請(qing)廠家的(de)(de)(de)(de)專業人員進行(xing)檢修。后者的(de)(de)(de)(de)現象(xiang)是設(she)備(bei)的(de)(de)(de)(de)使(shi)用環(huan)境不好所致，設(she)備(bei)放(fang)(fang)置的(de)(de)(de)(de)環(huan)境溫(wen)(wen)度(du)，放(fang)(fang)置的(de)(de)(de)(de)位(wei)置（箱(xiang)體后與墻的(de)(de)(de)(de)距離(li)）要(yao)滿(man)足要(yao)求（在設(she)備(bei)操(cao)作(zuo)使(shi)用說(shuo)明中(zhong)都有規定(ding)）。
 ◆恒(heng)溫恒(heng)濕(shi)試驗箱在(zai)做濕(shi)熱試驗中(zhong)，出現(xian)(xian)實(shi)際濕(shi)度(du)會(hui)達到或者(zhe)(zhe)實(shi)際濕(shi)度(du)與目標濕(shi)度(du)相差(cha)很(hen)大(da)，數值(zhi)低得很(hen)多，前者(zhe)(zhe)的(de)(de)現(xian)(xian)象(xiang)：可(ke)能是(shi)(shi)濕(shi)球(qiu)傳(chuan)感(gan)器(qi)(qi)上的(de)(de)紗(sha)布干(gan)燥引(yin)起，那就(jiu)(jiu)要(yao)檢查(cha)濕(shi)球(qiu)傳(chuan)感(gan)器(qi)(qi)的(de)(de)水(shui)(shui)(shui)槽(cao)中(zhong)是(shi)(shi)否(fou)缺水(shui)(shui)(shui)，水(shui)(shui)(shui)槽(cao)中(zhong)的(de)(de)水(shui)(shui)(shui)位(wei)是(shi)(shi)由一水(shui)(shui)(shui)位(wei)控(kong)制(zhi)器(qi)(qi)自動控(kong)制(zhi)的(de)(de)，查(cha)水(shui)(shui)(shui)位(wei)控(kong)制(zhi)器(qi)(qi)供(gong)水(shui)(shui)(shui)系(xi)(xi)統(tong)(tong)是(shi)(shi)否(fou)供(gong)水(shui)(shui)(shui)正(zheng)常(chang)，水(shui)(shui)(shui)位(wei)控(kong)制(zhi)器(qi)(qi)工作是(shi)(shi)否(fou)正(zheng)常(chang)。另一種可(ke)能就(jiu)(jiu)是(shi)(shi)濕(shi)球(qiu)紗(sha)布因(yin)使用時間長(chang)，或供(gong)水(shui)(shui)(shui)水(shui)(shui)(shui)質純凈度(du)的(de)(de)原因(yin)，會(hui)使紗(sha)布變硬，使紗(sha)布無(wu)法吸收水(shui)(shui)(shui)份而干(gan)燥，只(zhi)要(yao)更換或清洗紗(sha)布即可(ke)排除以上現(xian)(xian)象(xiang)。后者(zhe)(zhe)的(de)(de)現(xian)(xian)象(xiang)主要(yao)是(shi)(shi)加(jia)(jia)(jia)濕(shi)系(xi)(xi)統(tong)(tong)不工作，查(cha)看加(jia)(jia)(jia)濕(shi)系(xi)(xi)統(tong)(tong)的(de)(de)供(gong)水(shui)(shui)(shui)系(xi)(xi)統(tong)(tong)，供(gong)水(shui)(shui)(shui)系(xi)(xi)統(tong)(tong)內(nei)是(shi)(shi)否(fou)有一定(ding)的(de)(de)水(shui)(shui)(shui)量，控(kong)制(zhi)加(jia)(jia)(jia)濕(shi)鍋爐水(shui)(shui)(shui)位(wei)的(de)(de)水(shui)(shui)(shui)位(wei)控(kong)制(zhi)是(shi)(shi)否(fou)正(zheng)常(chang)，加(jia)(jia)(jia)濕(shi)鍋爐內(nei)的(de)(de)水(shui)(shui)(shui)位(wei)是(shi)(shi)否(fou)正(zheng)常(chang)。如以上一切(qie)都正(zheng)常(chang)，那就(jiu)(jiu)要(yao)檢查(cha)電器(qi)(qi)控(kong)制(zhi)系(xi)(xi)統(tong)(tong)，這要(yao)請(qing)專業維(wei)修人員進行(xing)檢修。
◆恒溫恒濕試(shi)(shi)驗(yan)箱在試(shi)(shi)驗(yan)運行(xing)過程中突然出(chu)現(xian)故(gu)(gu)障(zhang)時，控制儀表上出(chu)現(xian)對(dui)應的故(gu)(gu)障(zhang)顯示提示并(bing)有聲訊報警(jing)提示。操(cao)作人員可(ke)以(yi)對(dui)照設備的操(cao)作使用中的故(gu)(gu)障(zhang)排(pai)除一章(zhang)中快(kuai)速檢查出(chu)屬于哪一類故(gu)(gu)障(zhang)，即可(ke)請(qing)專業人員快(kuai)速排(pai)除故(gu)(gu)障(zhang)，以(yi)確保試(shi)(shi)驗(yan)的正常進行(xing)。其它環境試(shi)(shi)驗(yan)設備在使用中還會有其它的現(xian)象(xiang)，那就要具體(ti)現(xian)象(xiang)，具體(ti)分(fen)析和排(pai)除。