In the field of gas-liquid phase equilibrium (VLE) experimental research, the static method and recirculation method are two commonly used experimental approaches. Among them, the recirculation analysis method stands out in VLE research on low-boiling-point working fluids (e.g., mixed refrigerants), thanks to its distinct technical advantages: short equilibrium time, simple sampling operation, and small single-sample volume. Building on the recirculation method, XIATECH has successfully launched the VLE1000 Phase Equilibrium Tester. While retaining its inherent strengths of "fast equilibrium and reliable data", the device has achieved comprehensive upgrades in system automation, control precision, and adaptability.

The device adopts a specially designed measurement system, which ensures high uniformity and stability of the sample temperature field in the equilibrium still. Both its temperature control fluctuation and temperature measurement accuracy are better than ±0.02℃. Equipped with a high-precision pressure measurement system, it effectively guarantees the accuracy and repeatability of measurement results.

The experimental system features a liquid-phase circulation pump design. Without disrupting the gas-liquid phase equilibrium or destabilizing the temperature field, it significantly accelerates the gas-liquid phase equilibrium process. The device supports testing under wide temperature ranges and high-pressure conditions, making it suitable for phase equilibrium research of various binary and ternary systems. It also offers flexible customization to tailor more demanding working conditions. Particularly applicable for determining phase equilibrium parameters of complex systems (e.g., mixed refrigerants), it provides flexible and reliable experimental support for the development of new working fluids.