Critical point apparatus

Function and Applications

Compact device for demonstrative, quantitative analysis of real gases as a function of pressure, temperature and volume.

• Observation of the transition from gaseous to liquid phase
• Recording of isotherms, isochores, isobars, vapor pressure curves
• Determination of critical data and coefficients of the Van der Waals equation of state

Equipment and Technical Data

• Transparent, volume-calibrated, temperature-controlled measuring capillary made of special glass, on stainless steel pressure chamber
• Handwheel for pressure generation
• Inlet valve with pressure can connection
• Outlet valve for vacuum pump connection
• Demonstrative pressure gauge and transparent plastic cylinder with hose connection olives for temperature control of the measuring volume
• Measuring capillary: Measuring range 4 ml pressure-resistant up to 7.5 MPa at 60 °C
  • Graduation 0.05 ml
• Pressure gauge: Measuring range 0 ... 50 bar (0 ... 5 MPa)
  • Graduation 0.5 bar
• Temperature range 0 ... 55 °C
• Dimensions (mm) 335 × 340 × 670

Accessories

Suitable gases:

• Pressure can sulphur hexaflouride (T_k = 45 °C, p_k = 38 × 10⁵ Pa) 41772-21
• Pressure can ethane (T_k = 32 °C, p_k = 49 × 10⁵ Pa) 41772-09
• Replacement material: Measuring capillary