資訊久治pall RCA218RZ090Z廠家進口

Z值Z值即溫度系數,系指使某一種微生物的D值下降一個對數單位,溫度應升高的值(℃),通常取1℃。它被用于定量的描述孢子對溫度變化的敏感程度,Z值越大孢子對溫度的敏感性越弱。FT值FT值系指給定的Z值下,程序所賦予待品在溫度T下的時間,以分表示。LgP=lgN-FT/DT式中P為產品中微生物存活的概率。N為產品前微生物的數量。溫度高時,FT值就小,溫度較低時,所需FT值就大。
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資訊久治pall RCA218RZ090Z廠家進口

主要用作超低溫致冷劑,與F22組成的制冷系統用于-8~-12℃的超低溫制冷裝置。也用作泡沫塑料的發泡劑,作制冷劑替代R12。名稱:R57A,HFC-57中文名稱:R57制冷劑分子量:99標準沸點:-46.8℃臨界溫度:71℃臨界壓力:3.7MPa(絕壓)臨界密度:.488g/cm3CAS編號:354-33-6/42-46-2破壞臭氧潛能值(ODP):全球變暖系數值(GWP):3985R717制冷劑R717(氨)制冷劑,氨是中溫制冷劑,化學分子式為NH3,沸點溫度-33.4℃,凝固點為-77.7℃,臨界溫度133℃,臨界壓力11.417MPa。
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資訊久治pall RCA218RZ090Z廠家進口

為什么切斷閥應盡量選用硬密封?切斷閥要求泄漏越低越好,軟密封閥的泄漏是低的,切斷效果當然好,但不耐磨、可靠性差。從泄漏量又小、密封又可靠的雙重標準來看,軟密封切斷就不如硬密封切斷好。如全功能超輕型調節閥,密封而堆有耐磨合金保護,可靠性高,泄漏率達1-7,已經能夠滿足切斷閥的要求。為什么套筒閥代替單、雙座閥卻沒有如愿以償?6年代問世的套筒閥,7年代在大量使用,8年代引進的石化裝置中套筒閥占的比率較大,那時,不少人認為,套筒閥可以取代單、雙座閥,成為第二代產品。
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低溫恒溫槽因為其自帶的循環系統導致溫場的均一性很高,越來越多的實驗應用到低溫恒溫槽。主要應用于石油、化工、電子儀表、物理、化學、生物工程、醫藥衛生、生命科學、輕工食品、物性測試及化學分析等研究部門,高等院校,企業質檢及生產部門,為用戶工作時提供一個熱冷受控,溫度均勻恒定的場源,對試驗樣品或生產的產品進行恒定溫度試驗或測試,也可作為直接加熱或制冷和輔助加熱或制冷的熱源或冷源。使用低溫恒溫槽有哪些注意事項呢在使用低溫恒溫槽之前槽內應加入液體介質(純水,酒精,甲基硅油),介質液面應低于工作臺2mm以內,否則通電工作時會損壞加熱器;低溫恒溫槽內液體介質的選用應符合以下原則:當工作溫度低于5℃時,液體介質一般選用酒精;當工作溫度在5~85℃時,液體介質一般選用水;當工作溫度在85~95℃時,液體介質可選用15%甘油水溶液,這樣可以減少水的蒸發;當工作溫度高于95℃時,液體介質一般選用油,并且所選擇的油品的開杯閃點值應高于工作溫度5℃以上;一般用粘度較小的甲基硅油。