Critical Point Apparatus

Product Overview

Application Area:?.. ? Qualitative Observations:?.. ? ? Liquid and gaseous states ? ? Dynamic compression and expansion ? ? Formation of the transition point at various temperatures ? Quantitative Measurements:?.. ? ? Display of the critical point and temperature ? ? Recording of isotherms in p V (Clapeyron) diagrams ? ? Recording of isotherms in pV p (Amegat) diagrams ? ? Pressure curves for a saturated vapor ? ? Differences between real gases and ideal gases Product Information:?.. A high precision device for studying the compression and liquefaction of a gas determining the critical point and recording isotherms in p V (Clapeyron) diagrams. The test gas is sulfur hexafluoride (SF6) which has a critical temperature of 318.6 K (45.5?C) and a critical pressure of 3.76 MPa (37.6 bars) allowing for a simple experiment set up. The apparatus includes a transparent measuring cell that is highly resistant to leakage and compression. The volume inside the cell is changed via a finely adjustable hand wheel the change being indicated by a combination of a fixed and a rotary scale to an accuracy of 1/1000 of the maximum volume. The pressure is generated by a hydraulic system containing castor oil of medically approved quality. The measuring cell and hydraulic system are separated by a cap seal which rolls in as the volume increases. This design means the pressure gradient between the measuring cell and oil chamber is negligible. A manometer measures gas pressure instead of oil pressure without taking up any dead space inside the measuring cell. During transitions from the gaseous to the liquid phases and vice versa it is therefore possible to observe the formation of the first drops of liquid and disappearance of the last gas bubbles. The measuring cell is enclosed in a transparent water chamber. A circulation thermostat allows the temperature to be maintained at a highly constant value which can be monitored by means of a thermometer. Practical indications of the volume pressure and temperature permit easy recording of p V or pV p diagrams providing qualitatively correct results. Pressure and temperature dependent volumetric corrections also provide quantitatively accurate results comparing favorably with standard reference values. Refer also to experiment?UE2040300. Specifications:?.. Critical temperature: 318.6 K (45.5?C) Critical pressure: 3.76 MPa (37.6 bars) Critical volume: 197.4 cm3/mol Critical density: ?0.74 g/mol Temperature range: 10 ? 60?C Maximum pressure: 6.0 MPa (60 bars) Maximum volume: 15.7 cm3 Manometer diameter: 160 mm Bore for temperature sensor: 6 mm?? Temperature control connections: 7 mm?ؠ Reducing valve connection: 1/8 ?ؠ Standard gas connection: 3.5 mm?ؠ Dimensions: 380 mm x 200 mm x 400 mm approx. Weight: 7 kg approx. Note:?.. According to laboratory best practices it is recommended to supply gas through a fixed pipeline when the critical point apparatus is used frequently. For occasional use it is more practical to source the test gas from a gas cylinder. Scope of delivery:?.. 1 ? Critical point device filled with hydraulic (castor) oil but without test gas (SF6) 1 ? Oil filling device 1 ? Angled 1.3 mm hexagonal spanner (for grub screw on rotary scale) 1 ? Plastic hose 3 mm internal diameter 1 ? 1/8 pipe screw connection (SW 11) 1 ? Grease gun Not in the scope of delivery but additionally required:?.. ? ? Sulphur hexafluoride SF6 Note:?.. Required for periodic degassing or refilling of hydraulic oil: ? ? Castor Oil (item no.: 1002671) ? ? High Power Vacuum Pump

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