恒溫恒濕試驗箱和高低溫試驗箱的區別

       恒(heng)溫(wen)(wen)恒(heng)濕(shi)(shi)試(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)和(he)高(gao)(gao)低(di)(di)(di)溫(wen)(wen)試(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)是兩(liang)個(ge)產(chan)品(pin)名稱，很多人咋(za)一看會以為區別很大，其實，它(ta)們屬(shu)同一系(xi)列產(chan)品(pin)，恒(heng)溫(wen)(wen)恒(heng)濕(shi)(shi)試(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)比(bi)高(gao)(gao)低(di)(di)(di)溫(wen)(wen)試(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)多了一個(ge)加濕(shi)(shi)系(xi)統，可以實現(xian)濕(shi)(shi)熱(re)試(shi)(shi)驗(yan)(yan)(yan)(yan)，而高(gao)(gao)低(di)(di)(di)溫(wen)(wen)試(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)是純粹的高(gao)(gao)溫(wen)(wen)、低(di)(di)(di)溫(wen)(wen)切(qie)換試(shi)(shi)驗(yan)(yan)(yan)(yan)，不(bu)同于恒(heng)溫(wen)(wen)恒(heng)濕(shi)(shi)試(shi)(shi)驗(yan)(yan)(yan)(yan)箱(xiang)的是，它(ta)的低(di)(di)(di)溫(wen)(wen)遠遠不(bu)只0℃，而有(you)多(duo)種范圍：A:-20℃～150℃ B:-40℃～150℃ C:-60℃～150℃ D:-70℃～150℃ E:-80℃～150℃，如果用戶還需要更低的溫度(du)，可以定(ding)制-220℃以內的低溫箱。

       恒溫恒濕試驗箱的加濕系統是(shi)通過淺漕加濕方(fang)法，加濕器控(kong)制方(fang)式：無觸點等周(zhou)期脈沖調寬，SSR（固態繼電器(qi)），濕(shi)度控制均采用P.I.D + S.S.R系(xi)統同(tong)頻道協調(diao)控制，具有水(shui)(shui)位自(zi)動(dong)補(bu)償、缺水(shui)(shui)報警系(xi)統來(lai)實現(xian)，加(jia)濕用(yong)水(shui)(shui)需采用(yong)純凈水(shui)(shui)或(huo)蒸餾水(shui)(shui)，不建議采用(yong)自(zi)來(lai)水(shui)(shui)，以免堵(du)塞水(shui)(shui)管或(huo)影響試驗效果，我(wo)司(si)標準的試驗箱(xiang)是采用(yong)外部手動(dong)加(jia)水(shui)(shui)，如果用(yong)戶場地內(nei)有純水(shui)(shui)裝(zhuang)(zhuang)水(shui)(shui)，我(wo)司(si)可(ke)加(jia)裝(zhuang)(zhuang)自(zi)動(dong)補(bu)水(shui)(shui)裝(zhuang)(zhuang)置，這樣一來(lai)，就(jiu)不用(yong)頻繁(fan)的手動(dong)加(jia)水(shui)(shui)了，使(shi)用(yong)較方便(bian)。

       高低溫試驗箱(xiang)-80℃以內的低(di)(di)溫(wen)(wen)(wen)是通(tong)用(yong)機(ji)械式壓(ya)(ya)縮機(ji)來實現，制(zhi)(zhi)(zhi)冷(leng)循環(huan)均(jun)采(cai)用(yong)逆卡若(ruo)循環(huan)，該循環(huan)由(you)兩(liang)個等(deng)溫(wen)(wen)(wen)過(guo)(guo)程(cheng)和(he)兩(liang)個絕熱過(guo)(guo)程(cheng)組成，其過(guo)(guo)程(cheng)如下：制(zhi)(zhi)(zhi)冷(leng)劑(ji)(ji)經壓(ya)(ya)縮機(ji)絕熱壓(ya)(ya)縮到較(jiao)(jiao)高的壓(ya)(ya)力，消耗了功使排氣溫(wen)(wen)(wen)度(du)升高，之(zhi)后(hou)制(zhi)(zhi)(zhi)冷(leng)劑(ji)(ji)經冷(leng)凝(ning)器等(deng)溫(wen)(wen)(wen)地和(he)四(si)周介(jie)質進行熱交(jiao)換將熱量傳給四(si)周介(jie)質。后(hou)制(zhi)(zhi)(zhi)冷(leng)劑(ji)(ji)經截(jie)流閥絕熱膨脹(zhang)做功，這(zhe)時制(zhi)(zhi)(zhi)冷(leng)劑(ji)(ji)溫(wen)(wen)(wen)度(du)降(jiang)低(di)(di)。最(zui)后(hou)制(zhi)(zhi)(zhi)冷(leng)劑(ji)(ji)通(tong)過(guo)(guo)蒸發器等(deng)溫(wen)(wen)(wen)地從(cong)溫(wen)(wen)(wen)度(du)較(jiao)(jiao)高的物體吸熱，使被冷(leng)卻物體溫(wen)(wen)(wen)度(du)降(jiang)低(di)(di)。

       此(ci)循環周而復始(shi)從而達到降(jiang)(jiang)溫(wen)(wen)之目(mu)的，如果是更低的溫(wen)(wen)度，是采用液氮(dan)制冷，液氮(dan)罐雙(shuang)層(ceng)帶盤管玻(bo)璃反(fan)應器：外層(ceng)可(ke)抽真(zhen)空保(bao)溫(wen)(wen)可(ke)，釜(fu)內(nei)靠耐(nai)腐(fu)耐(nai)溫(wen)(wen)換熱盤管加(jia)熱制冷升降(jiang)(jiang)溫(wen)(wen)，雙(shuang)層(ceng)帶保(bao)溫(wen)(wen)套(tao)玻(bo)璃反(fan)應器：保(bao)溫(wen)(wen)套(tao)保(bao)溫(wen)(wen),帶(dai)透光可視窗（內可抽(chou)真空或放無(wu)水蜂窩氯化(hua)鈣等，窗上玻璃(li)表面低溫(wen)不結霜），夾層通導熱(re)油加熱(re)制冷升(sheng)降溫(wen)。