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  • 2017

    6-26

    酸度計PHS-3C的幾個疑問知識解答

    有關酸度計PHS-3C的幾個疑問知識解答:1.如何看待溫度補償?嚴格地講,溫度補償應包含三部分:電斜率的溫度補償、電零點。酸度計PHS-3設置的溫度補償,只是補償電的斜率項。因此,溫度補償對酸度計測量并不是很充分的,也不能*消除由溫度引起的誤差。只是由于溶液的溫度項和電零點溫度項既無法確定,引起的誤差又很小,故可略去不計。2.為什么酸度計上的電必須定期標定并校準?酸度計的精度和壽命取決于電,價格差異也很大,但很多時候是使用方法不當,致使測量不準。酸度計使用過一段時間后都要重新...
  • 2017

    6-8

    氫氣發生器常見問題以及解決

    氫氣發生器由,電解池、水箱、氫/水分離器、收集器、干燥器、傳感器、壓力調節閥、開關電源等部件組成。只電解水即可產氫。一、氫氣發生器日常維護儀器正常使用中,一般維護需注意去離子水的補加,每次補加的量不要超過液位的上限,補加去離子水的頻率與氫氣用量的大小和環境溫度有關。變色硅膠(干燥劑)的更換,干燥劑底部變紅色時需要更換,將儀器中的氫氣放出,將干燥劑筒整體擰下(逆時針方向),然后更換。保證干燥劑筒上蓋內的橡膠面無干燥劑附著擰緊后,干燥劑筒正對干燥底座擰上,力量適中,不要太大。二、...
  • 2017

    5-24

    博迅鼓風干燥箱實驗前的準備工作要做好

    博迅鼓風干燥箱適用于工礦企業、大專院校、醫藥衛生、科研單位等對物品進行烘焙、干燥、溶解等用。還適用于生物、農業、電子、化工、環境保護、科研單位等部門對物品進行烘焙、干燥、溶解、消毒等用。博迅鼓風干燥箱采用低噪聲風機,通用送風系統使空氣所經過加熱體時能大限度的帶走很多熱量,很快達到設定溫度。博迅鼓風干燥箱具有設計優良,造型新穎,工藝,控溫,性能穩定,容易維護,操作方便等優點。博迅鼓風干燥箱在使用前的準備工作要做好,怎么做呢?1.先通電前,先檢查鼓風干燥箱的電氣性能,并應注意是否...
  • 2017

    5-17

    對液相色譜儀的色譜工作站硬件有哪些要求

    色譜工作站是色譜信號的一種收集,處理和傳輸裝置,它由軟件和硬件兩部分組成,實現采集、處理實驗數據和操控色譜分析儀器的功能。色譜工作站只要會操作WINDOWS就會使用,更適合國人習慣的,功能強大的液相色譜儀工作站軟件。色譜工作站有什么功能?對于硬件的要求有哪些?對液相色譜儀色譜工作站硬件的要求主要有以下五點:1.對工作站可靠性的要求。目前很多國產色譜工作站硬件在電路設計和元器件選用上存在缺陷,造成硬件的穩定性差。有部分硬件在保修期內反復出問題,大的損壞了品牌形象。2.對量程范圍...
  • 2017

    5-15

    高壓滅菌鍋的簡介

    高壓滅菌鍋又名高壓蒸汽滅菌鍋,可分為手提式滅菌鍋和立式高壓滅菌鍋。利用電熱絲加熱水產生蒸汽,并能維持一定壓力的裝置。主要有一個可以密封的桶體,壓力表,排氣閥,安全閥,電熱絲等組成。一、高壓蒸汽滅菌器使用方法(1)在外層鍋內加適量的水,將需要滅菌的物品放入內層鍋,蓋好鍋蓋并對稱地扭緊螺旋。(2)加熱使鍋內產生蒸氣,當壓力表指針達到33.78kPa時,打開排氣閥,將冷空氣排出,此時壓力表指針下降,當指針下降零時,即將排氣閥關好。(3)繼續加熱,鍋內蒸氣增加,壓力表指針又上升,當鍋...
  • 2017

    5-11

    水份測定儀的工作原理

    水份測定儀能夠檢測各類有機及無機固體、液體、氣體等樣品中含水率的的儀器叫做水分測定儀,按測定原理可以分類物理測定法和化學測定法兩大類。鹵素快速水份測定儀是深圳市冠亞電子研發的一種新型快速的水分檢測儀器。其環狀的鹵素加熱器確保樣品在高溫測試過程中均勻受熱,使樣品表面不易受損,快速干燥,在干燥過程中,水分儀持續測量并即時顯示樣品丟失的水分含量%,干燥程序完成后,終測定的水分含量值被鎖定顯示。與烘箱加熱法相比,其檢測結果具有良好的一致性,具有可替代性,且檢測效率遠遠高于烘箱法。一般...
  • 2017

    5-9

    上海棱光紫外可見分光光度計(杭州,上海,南昌,全國推薦)

    紫外分光光度計就是根據物質的吸收光譜研究物質的成分、結構和物質間相互作用的有效手段。紫外分光光度計可以在紫外可見光區任意選擇不同波長的光。物質的吸收光譜就是物質中的分子和原子吸收了入射光中的某些定波長的光能量,相應地發生了分子振動能級躍遷和電子能級躍遷的結果。由于各種物質具有各自不同的分子、原子和不同的分子空間結構,其吸收光能量的情況也就不會相同,因此,每種物質就有其有的、固定的吸收光譜曲線,可根據吸收光譜上的某些征波長處的吸光度的高低判別或測定該物質的含量。物質的吸收光譜本...
  • 2017

    5-4

    熔點儀的使用注意事項

    熔點儀根據物理化學的定義,物質的熔點是指該物質由固態變為液態時的溫度。在有機化學領域中,熔點測定是辨認物質本性的基本手段,也是度測定的重要方法之一。因此,熔點測定儀在化學工業、醫藥研究中據有重要地位,是生產藥物、香料、染料及其他有機晶體物質的*儀器。是按照藥典規定的熔點檢測方法而設計的,該儀器利用電子技術實現溫度程控,初熔和終熔數字顯示。應用了線性校正的鉑電阻作檢測元件,并用電子線路實現了快速“起始溫度”設定及四檔可供選擇的線性的升溫速率。儀器采用藥典規定的毛細管作為樣品管,...
  • 2017

    4-24

    干燥箱日常使用時應該注意哪些呢?

    干燥箱又名“烘箱”,分為鼓風干燥和真空干燥兩種,鼓風干燥就是通過循環風機吹出熱風,保證箱內溫度平衡,真空干燥是采用真空泵將箱內的空氣抽出,讓箱內大氣壓低于常壓,使產品在一個很干凈的狀態下做試驗,是一種常用的儀器設備,主要用來干燥樣品,也可以提供實驗所需的溫度環境。干燥箱廣泛應用于各個行業;如:電子元器件干燥,工農業,醫療衛生,塑料機械,大專院校和科研部門的生產車間或實驗室等。使用須知1、該箱安放在室內干燥的地面和工作臺面處,二氧化碳培養箱不必使用其他固定裝置。2、應在供電線路...
  • 2017

    4-20

    分光光度計在選購時應該注意哪些問題?

    分光光度計,又稱光譜儀,是將成分復雜的光,分解為光譜線的科學儀器。所用儀器為紫外分光光度計、可見光分光光度計(或比色計)、紅外分光光度計或原子吸收分光光度計。為保證測量的精密度和準確度,所有儀器應按照計量檢定規程或本附錄規定,定期進行校正檢定。儀器組成分光光度計已經成為現代分子生物實驗室常規儀器。常用于核酸,蛋白定量以及細菌生長濃度的定量。儀器主要由光源、單色器、樣品室、檢測器、信號處理器和顯示與存儲系統組成。種類繁多,但不外乎簡易型、中檔型和型三大類。我們在選用分光光度計時...
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