CPT 200-Critical temperature and pressure tester


The CPT-200 evaluates the critical point of pure compounds as well as binary mixtures. Critical temperature and critical pressure (Tc, Pc) are detected by critical opalescence in a transparent cell. The system encompasses two syringe pumps which store the pure compounds (liquid or liquefied gas) and synchronously operate to inject a constant composition mixture throughout the duration of the experiment. To prevent temperature and pressure fluctuations, pump cylinder temperature is regulated with an isothermal jacket and a refrigerant circulating bath. The mixture is fed into a sapphire visualization cell located in a thermostatic air bath. An external image capturing system records the test fluid while high-resolution sensors continuously monitor temperature and pressure. Far above the critical point, only a supercritical transparent phase is observed while far below, two distinct phases can be distinguished. However in its nearby region, an opalescence phenomenon is observed as a result of density fluctuations and light scattering. The procedure is repeated several times to maximize the accuracy of the results.


Pressure: up to 3,000 psi
Temperature: up to 200°C
Temperature accuracy: 0.1 °C
Pressure accuracy: 0.1% FS
Sample volume: 0.1% FS
Material: Hastelloy
Power supply:  220 VAC - 50/60 Hz


* Repeatable measurements
* Automated tests