Option - Pressure Cell

The pressure cell adapts to the Tracker H that is available for measurements at elevated temperature and pressure.
For the range between -10°C to +80°C, temperature is controlled using a bath to circulate liquid through coils surrounding the chamber. Temperatures from 50°C to 200°C are obtained using electrical heaters built into the walls surrounding the chamber.

Chambers are sealed to the external environment and can be pressurized using a variety of gases such as nitrogen, argon, carbon dioxide, and methane. Chambers with a maximum pressure rating of 15, 100, and 200 bars (all at 200°C) are available. Higher pressure chambers can be custom built. The syringe drive system operates through special seals in the chamber.

Chamber

Principle

Environmental chambers enclose the syringe and sample cell in metal housing that is mounted onto brackets fixed to the Tracker H. The syringe piston is accessible from outside the housing where it is driven by the syringe pump. The sample is viewed through two glass windows fitted onto the sides of the pressure housing.  

Pressure is applied by connecting the housing to a pressurized supply of gas (such as nitrogen, argon, air, or carbon dioxide) through the Gas Control Box. Gas/liquid or liquid/liquid systems can be measured. For gas liquid, the drop can be pendant or rising (a bubble of gas).  
In the latter case, the syringe can (if desired) be filled with the pressurizing gas. A separate thermocouple measures temperature of liquid inside the cell.

Temperature control is achieved by using an external circulating bath, by resistance heaters built into the environmental chamber walls, or a combination of the two. A control unit (mounted in the electronics control unit) supplies power to electrical heaters and displays set and actual temperature of the environmental chamber jacket.