Critical Point Apparatus

Critical Point Apparatus, 1002670 [U104001], Gas Laws
Critical Point Apparatus, 1002670 [U104001], Gas Laws
Critical Point Apparatus, 1002670 [U104001], Gas Laws
$ 8,184.00
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Overview of all experiments in which the product is used
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 Ø
Temperature control connections: 7 mm Ø 
Reducing valve connection: 1/8" Ø 
Standard gas connection: 3.5 mm Ø 
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

Item No.: 1002670 [U104001]
Weight 18.41 lb
Dimensions 20.0 x 17.0 x 11.0 in
Brand 3B Scientific

Documentation

PDF Product Manual - Critical Point Apparatus - U104001 [1002670] (EN)
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