業內、研究以及教學科學家與化學工程師仍在測量相變平衡，儘管理論估計上已有了重大的改進。

因此，FISCHER^®相變平衡儀器是化學工程實驗室裡標準設備中的一個重要部分。

二元及多成分混合物的水蒸氣-液體平衡構成了評估分離過程中所需要進行的理論板塊測定的重要基礎。雖然VLE資料可從文獻中得知，通過實驗重新測定平衡資料的趨勢仍在增加，因為所用的熱力學參數如壓力、溫度及濃度等都不同或不足。

對於如萃取蒸餾等過程的設計必需評估水蒸氣-液體-液體相變平衡（VLLE資料）。使用標準化的VLE系統為這些資料進行實際測量因液體的相位形成而有一定的困難。

i-Fischer Engineering GmbH得到西班牙阿利坎特大學的獨家授權與該大學緊密合作，將公司的專利科學構思適應以製造一個適用於連續生產的儀器設計。

因此，除了一般常見用於測定VLE資料的儀器以外，市場上如今也有為測定VLE資料而特別設計的儀器。

   Scientists and chemical engineers in industry, research and teaching still measure phase equilibria despite the significant improvement in theoretical evaluations.

For that reason, the FISCHER® - phase equilibrium apparatus is part of the standard equipment in chemical engineering laboratories.

The vapour-liquid equilibrium of binary and multi-component mixtures constitute an essential basis for the determination of the theoretical plates necessary for the evaluation of separation processes. Although VLE-data are known from literature, there is still an increasing tendency towards re-deter-mining equilibrium data by experiments, because the thermodynamic para-meters like pressure, temperature and concentrations are different or inadequate.

For designing e.g. extractive-distillation processes the evaluation of vapour-liquid-liquid phase equilibria (VLLE-data) are required. The practical measurement and determination of these data proves difficult with the standardized VLE-units because of the phase formation of the liquids.

i-Fischer Engineering GmbH collaborates closely under an exclusive license with the University of Alicante (Spain) and adapted their patented scientific idea (ES 2 187 220 B2) to create a device design suitable for serial production.

Hence, besides the common apparatus for determining VLE-data there now a specifically designed apparatus for determining VLLE-data available in the market, too.