恒溫恒濕試驗機是集合了溫、低溫、濕熱為體的試驗箱—低溫濕熱交變試驗箱，它的修理難度較其它環境試驗設備大，且具有代表性。下面就低溫濕熱交變試驗箱為例，談談恒溫恒濕試驗箱的構造及些常見故障和排除方法。恒溫恒濕試驗箱的構造：恒溫恒濕試驗箱由箱體、風循環系統、制冷系統、加熱系統和控濕系統組成。風循環系統般采用可調節送風方向的結構;加濕系統有采用鍋爐加濕和表面蒸發種;降溫、除濕系統采用空調工況制冷結構;加熱系統采用電熱鰭片加熱和電爐絲直接加熱種結構;溫濕度測試方法采用干濕球測試方法，也有用濕度傳感器直接測量方法;控制和顯示操作界面采用溫濕度分開獨立和溫濕度組合控制器等方式。
恒溫(wen)(wen)(wen)(wen)恒濕(shi)(shi)試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)的(de)(de)(de)(de)(de)些常(chang)見故(gu)(gu)(gu)(gu)障和排(pai)除(chu)(chu)(chu)方法(fa)：在溫(wen)(wen)(wen)(wen)試(shi)(shi)(shi)驗(yan)(yan)中(zhong)(zhong)，如溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)變(bian)(bian)化達(da)不到(dao)試(shi)(shi)(shi)驗(yan)(yan)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)值時，可(ke)以檢(jian)查(cha)(cha)電(dian)器系(xi)(xi)統(tong)(tong)(tong)，逐排(pai)除(chu)(chu)(chu)故(gu)(gu)(gu)(gu)障。如溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)升(sheng)得很(hen)(hen)(hen)慢，就(jiu)(jiu)(jiu)要(yao)(yao)查(cha)(cha)看(kan)風循環系(xi)(xi)統(tong)(tong)(tong)，看(kan)下風循環的(de)(de)(de)(de)(de)調節擋板是(shi)否(fou)(fou)開(kai)啟正(zheng)(zheng)常(chang)，反(fan)之，就(jiu)(jiu)(jiu)檢(jian)查(cha)(cha)風循環的(de)(de)(de)(de)(de)電(dian)機(ji)運轉是(shi)否(fou)(fou)正(zheng)(zheng)常(chang)。如溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)過沖厲(li)害(hai)那(nei)(nei)么就(jiu)(jiu)(jiu)需要(yao)(yao)整定(ding)(ding)PID的(de)(de)(de)(de)(de)設(she)(she)(she)置參數。如果(guo)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)直接上(shang)升(sheng)，過溫(wen)(wen)(wen)(wen)保(bao)護，那(nei)(nei)么，控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)器出故(gu)(gu)(gu)(gu)障，須更(geng)換控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)儀(yi)表。低(di)(di)溫(wen)(wen)(wen)(wen)達(da)不到(dao)試(shi)(shi)(shi)驗(yan)(yan)的(de)(de)(de)(de)(de)指標(biao)，那(nei)(nei)你就(jiu)(jiu)(jiu)要(yao)(yao)觀察溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)的(de)(de)(de)(de)(de)變(bian)(bian)化，是(shi)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)降(jiang)的(de)(de)(de)(de)(de)很(hen)(hen)(hen)慢，還(huan)(huan)是(shi)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)到(dao)定(ding)(ding)值后(hou)(hou)溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)有(you)回升(sheng)的(de)(de)(de)(de)(de)趨勢，前者就(jiu)(jiu)(jiu)要(yao)(yao)檢(jian)查(cha)(cha)下，做低(di)(di)溫(wen)(wen)(wen)(wen)試(shi)(shi)(shi)驗(yan)(yan)前是(shi)否(fou)(fou)將工(gong)作(zuo)室烘干，使(shi)(shi)(shi)工(gong)作(zuo)室保(bao)持(chi)干燥后(hou)(hou)再將試(shi)(shi)(shi)驗(yan)(yan)樣品放入(ru)工(gong)作(zuo)室內(nei)再做試(shi)(shi)(shi)驗(yan)(yan)，工(gong)作(zuo)室內(nei)的(de)(de)(de)(de)(de)試(shi)(shi)(shi)驗(yan)(yan)樣品是(shi)否(fou)(fou)放置的(de)(de)(de)(de)(de)過多(duo)，使(shi)(shi)(shi)工(gong)作(zuo)室內(nei)的(de)(de)(de)(de)(de)風不能充分循環，在排(pai)除(chu)(chu)(chu)上(shang)述原因(yin)后(hou)(hou)，就(jiu)(jiu)(jiu)要(yao)(yao)考慮是(shi)否(fou)(fou)是(shi)制(zhi)(zhi)(zhi)(zhi)(zhi)冷(leng)系(xi)(xi)統(tong)(tong)(tong)中(zhong)(zhong)的(de)(de)(de)(de)(de)故(gu)(gu)(gu)(gu)障了(le)，這(zhe)樣就(jiu)(jiu)(jiu)要(yao)(yao)請(qing)廠(chang)的(de)(de)(de)(de)(de)專(zhuan)業人(ren)員(yuan)(yuan)進行(xing)(xing)檢(jian)修。后(hou)(hou)者的(de)(de)(de)(de)(de)現象(xiang)(xiang)是(shi)設(she)(she)(she)備(bei)的(de)(de)(de)(de)(de)使(shi)(shi)(shi)用(yong)環境不好所致(zhi)，設(she)(she)(she)備(bei)放置的(de)(de)(de)(de)(de)環境溫(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)(du)，放置的(de)(de)(de)(de)(de)位(wei)(wei)置(箱(xiang)體(ti)后(hou)(hou)與(yu)墻(qiang)的(de)(de)(de)(de)(de)距離)要(yao)(yao)滿足要(yao)(yao)求(在設(she)(she)(she)備(bei)操(cao)作(zuo)使(shi)(shi)(shi)用(yong)說(shuo)(shuo)明(ming)中(zhong)(zhong)都有(you)規(gui)定(ding)(ding))。在做濕(shi)(shi)熱試(shi)(shi)(shi)驗(yan)(yan)中(zhong)(zhong)，出現實際濕(shi)(shi)度(du)(du)(du)(du)(du)(du)會(hui)達(da)到(dao)或者實際濕(shi)(shi)度(du)(du)(du)(du)(du)(du)與(yu)目標(biao)濕(shi)(shi)度(du)(du)(du)(du)(du)(du)相差很(hen)(hen)(hen)大，數值低(di)(di)得很(hen)(hen)(hen)多(duo)，前者的(de)(de)(de)(de)(de)現象(xiang)(xiang)：可(ke)能是(shi)濕(shi)(shi)球(qiu)傳感器上(shang)的(de)(de)(de)(de)(de)紗(sha)布干燥引起，那(nei)(nei)就(jiu)(jiu)(jiu)要(yao)(yao)檢(jian)查(cha)(cha)濕(shi)(shi)球(qiu)傳感器的(de)(de)(de)(de)(de)水(shui)(shui)(shui)(shui)槽中(zhong)(zhong)是(shi)否(fou)(fou)缺水(shui)(shui)(shui)(shui)，水(shui)(shui)(shui)(shui)槽中(zhong)(zhong)的(de)(de)(de)(de)(de)水(shui)(shui)(shui)(shui)位(wei)(wei)是(shi)由水(shui)(shui)(shui)(shui)位(wei)(wei)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)器自動(dong)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)的(de)(de)(de)(de)(de)，查(cha)(cha)水(shui)(shui)(shui)(shui)位(wei)(wei)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)器供(gong)水(shui)(shui)(shui)(shui)系(xi)(xi)統(tong)(tong)(tong)是(shi)否(fou)(fou)供(gong)水(shui)(shui)(shui)(shui)正(zheng)(zheng)常(chang)，水(shui)(shui)(shui)(shui)位(wei)(wei)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)器工(gong)作(zuo)是(shi)否(fou)(fou)正(zheng)(zheng)常(chang)。另種可(ke)能就(jiu)(jiu)(jiu)是(shi)濕(shi)(shi)球(qiu)紗(sha)布因(yin)使(shi)(shi)(shi)用(yong)時間長(chang)，或供(gong)水(shui)(shui)(shui)(shui)水(shui)(shui)(shui)(shui)質純凈度(du)(du)(du)(du)(du)(du)的(de)(de)(de)(de)(de)原因(yin)，會(hui)使(shi)(shi)(shi)紗(sha)布變(bian)(bian)硬，使(shi)(shi)(shi)紗(sha)布無(wu)法(fa)吸收水(shui)(shui)(shui)(shui)份(fen)而干燥，只要(yao)(yao)更(geng)換或清洗(xi)紗(sha)布即可(ke)排(pai)除(chu)(chu)(chu)以上(shang)現象(xiang)(xiang)。后(hou)(hou)者的(de)(de)(de)(de)(de)現象(xiang)(xiang)主(zhu)要(yao)(yao)是(shi)加濕(shi)(shi)系(xi)(xi)統(tong)(tong)(tong)不工(gong)作(zuo)，查(cha)(cha)看(kan)加濕(shi)(shi)系(xi)(xi)統(tong)(tong)(tong)的(de)(de)(de)(de)(de)供(gong)水(shui)(shui)(shui)(shui)系(xi)(xi)統(tong)(tong)(tong)，供(gong)水(shui)(shui)(shui)(shui)系(xi)(xi)統(tong)(tong)(tong)內(nei)是(shi)否(fou)(fou)有(you)定(ding)(ding)的(de)(de)(de)(de)(de)水(shui)(shui)(shui)(shui)量，控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)加濕(shi)(shi)鍋爐水(shui)(shui)(shui)(shui)位(wei)(wei)的(de)(de)(de)(de)(de)水(shui)(shui)(shui)(shui)位(wei)(wei)控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)是(shi)否(fou)(fou)正(zheng)(zheng)常(chang)，加濕(shi)(shi)鍋爐內(nei)的(de)(de)(de)(de)(de)水(shui)(shui)(shui)(shui)位(wei)(wei)是(shi)否(fou)(fou)正(zheng)(zheng)常(chang)。如以上(shang)切都正(zheng)(zheng)常(chang)，那(nei)(nei)就(jiu)(jiu)(jiu)要(yao)(yao)檢(jian)查(cha)(cha)電(dian)器控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)系(xi)(xi)統(tong)(tong)(tong)，這(zhe)要(yao)(yao)請(qing)專(zhuan)業維修人(ren)員(yuan)(yuan)進行(xing)(xing)檢(jian)修。設(she)(she)(she)備(bei)在試(shi)(shi)(shi)驗(yan)(yan)運行(xing)(xing)過程(cheng)中(zhong)(zhong)突然出現故(gu)(gu)(gu)(gu)障時，控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)儀(yi)表上(shang)出現對(dui)(dui)應(ying)(ying)的(de)(de)(de)(de)(de)故(gu)(gu)(gu)(gu)障顯(xian)示提示并(bing)有(you)聲(sheng)訊(xun)報警提示。操(cao)作(zuo)人(ren)員(yuan)(yuan)可(ke)以對(dui)(dui)照設(she)(she)(she)備(bei)的(de)(de)(de)(de)(de)操(cao)作(zuo)使(shi)(shi)(shi)用(yong)中(zhong)(zhong)的(de)(de)(de)(de)(de)故(gu)(gu)(gu)(gu)障排(pai)除(chu)(chu)(chu)章中(zhong)(zhong)快(kuai)速檢(jian)查(cha)(cha)出屬于哪類故(gu)(gu)(gu)(gu)障，即可(ke)請(qing)專(zhuan)業人(ren)員(yuan)(yuan)快(kuai)速排(pai)除(chu)(chu)(chu)故(gu)(gu)(gu)(gu)障，以確保(bao)試(shi)(shi)(shi)驗(yan)(yan)的(de)(de)(de)(de)(de)正(zheng)(zheng)常(chang)進行(xing)(xing)。其它環境試(shi)(shi)(shi)驗(yan)(yan)設(she)(she)(she)備(bei)在使(shi)(shi)(shi)用(yong)中(zhong)(zhong)還(huan)(huan)會(hui)有(you)其它的(de)(de)(de)(de)(de)現象(xiang)(xiang)，那(nei)(nei)就(jiu)(jiu)(jiu)要(yao)(yao)具體(ti)現象(xiang)(xiang)，具體(ti)分析和排(pai)除(chu)(chu)(chu)。低(di)(di)溫(wen)(wen)(wen)(wen)試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)或恒溫(wen)(wen)(wen)(wen)恒濕(shi)(shi)試(shi)(shi)(shi)驗(yan)(yan)箱(xiang)還(huan)(huan)要(yao)(yao)定(ding)(ding)期進行(xing)(xing)維護保(bao)養，制(zhi)(zhi)(zhi)(zhi)(zhi)冷(leng)系(xi)(xi)統(tong)(tong)(tong)的(de)(de)(de)(de)(de)冷(leng)凝器定(ding)(ding)期清理，對(dui)(dui)于活(huo)動(dong)部件應(ying)(ying)按說(shuo)(shuo)明(ming)書加油潤滑，電(dian)器控(kong)(kong)(kong)制(zhi)(zhi)(zhi)(zhi)(zhi)系(xi)(xi)統(tong)(tong)(tong)定(ding)(ding)期維護檢(jian)查(cha)(cha)等(deng)(deng)等(deng)(deng)，這(zhe)些工(gong)作(zuo)是(shi)必不可(ke)少的(de)(de)(de)(de)(de)。

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