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                      上海標承實驗儀器有限公司,歡迎您

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                      真空干燥箱使用注意事項

                      發布時間:2021/12/21 17:18:12

                      真空干燥箱實驗重要輔助干燥設備之一,應用范圍廣泛,操作較復雜,因此,較一般烘箱有著更高的要求,使用過程中就有著更多需要注意的地方。今天電熱匯來介紹一下!

                      真空干燥箱是專為干燥熱敏性、易分解和易氧化物質而設計的,工作時可使工作室內保持一定的真空度,并能夠向內部充入惰性氣體,特別是一些成分復雜的物品也能進行快速干燥,采用智能型數字溫度調節儀進行溫度的設定、顯示與控制。

                      一、樣品放置

                      將需干燥物料均勻放入干燥箱內樣品架上,推入干燥箱內。

                      注意事項:

                      ①不可在烘箱加熱狀態下放置樣品,需在確保加熱關閉狀態下放置樣品;

                      ②放置樣品時,上下四周應留存一定空間,保持箱內氣流暢通;

                      ③若樣品在干燥過程中會產生相態變化,必須裝在托盤中,避免污染其他樣品;

                      ④干燥的物品如干燥后重量變輕,體積變小,應在箱內抽真空口加隔阻網,以防干燥物吸入而損壞真空泵(或電磁閥);

                      ⑤任何液態溶劑以及真空狀態下燃點、沸點降低至150℃以下物品,嚴禁放入箱內。

                      二、關緊箱門

                      將箱門輕輕關閉。

                      注意事項:

                      ①關閉時不可太用力,避免造成箱體大幅震動;

                      ②箱門上有螺栓,關閉時需確認箱門與硅膠密封條緊密結合。

                      三、開啟真空

                      將真空泵與真空閥連接,依次開啟真空泵、真空閥,抽真空。

                      注意事項:
                      ①依據真空泵的性能,抽到壓力表為真空泵的極限值為準;
                      ②達到真空度后,先將真空閥門關閉(如果真空閥門關不緊,需及時更換),然后再將真空泵電源關閉或移除 (防止倒吸現象產生);
                      ③觀察真空壓力表,確保數值穩定無明顯波動;
                      ④若真空度小于干燥物品要求時,再次打開真空泵電源、真空閥門,繼續抽真空,這樣可延長真空泵使用壽命。
                      4加熱
                      打開加熱開關,設置所需溫度。
                      注意事項:
                      ①加熱步驟必須在真空穩定狀態下進行,否則易導致內外壓強及溫度差,造成外部大氣沖入箱內等突發狀況;
                      ②升溫過程中,加熱指示燈長亮,達到設置溫度后,加熱自動停止,同時指示燈熄滅。待溫度低于設置溫度時,加熱再次啟動,加熱指示燈亮;
                      ③加熱指示燈及溫度需正常顯示,若指示燈不亮需及時關閉電源并聯系儀器負責人。
                      5.溫度設置
                      設置所需溫度。
                      注意事項:
                      ①設置溫度不可超過額定溫度,真空下物料燃點、沸點驟降,設置溫度不合理會造成固態物料熔融結塊等現象;
                      ②數顯溫度需正常指示,若不顯示或出現閃爍、跳躍等異常需及時關閉電源并聯系儀器負責人;
                      ③操作人員,需待實際溫度與設置溫度一致,加熱指示燈熄滅后,方可離開;
                      ④為避免控溫失靈,需有專人定時查看儀器運行是否正常,并留意烘烤物料變化情況,若發現異常需第一時間關閉加熱、切斷電源、打開放氣閥門,并及時上報。
                      6取樣
                      先關閉加熱開關,再將放氣閥門緩慢打開,真空度為0時開啟箱門取出樣品。
                      注意事項:
                      ①放氣時切勿將閥門一次開至最大,避免外部氣流進入箱內時沖擊樣品,造成箱內及樣品間的污染;
                      ②真空度未到0時,禁止開啟箱門(原因同上);
                      ③由于長時間真空導致箱門密封硅橡膠變形而無法打開箱門時,不可強制開啟箱門,只需等待密封硅橡膠圈緩慢恢復原狀,即可打開箱門。
                      ④取樣完畢后,及時關閉放氣閥門。
                      真空泵維護及保養
                      1.經常檢查油位位置,不符合規定時須調整使之符合要求。以真空泵運轉時,油位到油標中心為準。
                      2.經常檢查油質情況,發現油變質應及時更換新油,確保真空泵工作正常。
                      3.換油期限按實際使用條件和能否滿足性能要求等情況考慮,由用戶酌情決定。一般新真空泵,抽除清潔干燥的氣體時,建議在工作100小時左右換油一次。待油中看不到黑色金屬粉末后,以后可適當延長換油期限。
                      4.一般情況下,真空泵工作2000小時后應進行檢修,檢查桷膠密封件老化程度,檢查排氣閥片是否開裂,清理沉淀在閥片及排氣閥座上的污物。清洗整個真空泵腔內的零件,如轉子、旋片、彈簧等。一般用汽油清洗,并烘干。對橡膠件類清洗后用干布擦干即可。清洗裝配時應輕拿輕放小心碰傷。
                      5.有條件的對管中同樣進行清理,確保管路暢通。
                      6.重新裝配后應進行試運行,一般須空運轉2小時并換油二次,因清洗時在真空泵中會留有一定量易揮發物,待運轉正常后,再投入正常工作。
                      7.檢查真空泵管路及結合處有無松動現象。用手轉動真空泵,試看真空泵是否靈活。
                      8.向軸承體內加入軸承潤滑機油,觀察油位應在油標的中心線處,潤滑油應及時更換或補充。
                      9.擰下真空泵泵體的引水螺塞,灌注引水(或引漿)。
                      10.關好出水管路的閘閥和出口壓力表及進口真空表。
                      11.點動電機,試看電機轉向是否正確。
                      12.開動電機,當真空泵正常運轉后,打開出口壓力表和進口真空泵,視其顯示出適當壓力后,逐漸打開閘閥,同時檢查電機負荷情況。
                      13.盡量控制真空泵的流量和揚程在標牌上注明的范圍內,以保證真空泵在最高效率點運轉,才能獲得最大的節能效果。
                      14.真空泵在運行過程中,軸承溫度不能超過環境溫度35C,最高溫度不得超過80C。
                      15.如發現真空泵有異常聲音應立即停車檢查原因。
                      16.真空泵要停止使用時,先關閉閘閥、壓力表。

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