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WL 204

- Recording the vapour pressure curve of water
- Saturation pressure of water vapour as a function of the temperature


Technical Description

In a closed system filled with fluid, a thermodynamic equilibrium sets in between the fluid and its vaporised phase. The prevailing pressure is called vapour pressure. It is substance-specific and temperature-dependent.

When a fluid is heated in a closed tank, the pressure increases as the temperature rises. Theoretically, the pressure increase is possible up to the critical point at which the densities of the fluid and gaseous phases are equal. Fluid and vapour are then no longer distinguishable from each other. This knowledge is applied in practice in process technology for freeze drying or pressure cooking.

The WL 204 experimental unit can be used to demonstrate the relationship between the pressure and temperature of water in a straightforward manner. Temperatures of up to 200°C are possible for recording the vapour pressure curve. The temperature and pressure can be continuously monitored via a digital temperature display and a Bourdon tube pressure gauge.

A temperature limiter and pressure relief valve are fitted as safety devices and protect the system against overpressure.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments
- recording the vapour pressure curve of water
- presentation of the relationship between pressure and temperature in a closed system
- temperature and pressure measurement
- influence of foreign gases (air) on the pressure


[1] measuring a vapour pressure curve for saturated vapour
[2] boiler with insulating jacket
[3] temperature limiter and safety valve protect against overpressure in the system
[4] Bourdon tube pressure gauge to indicate pressure
[5] digital temperature display 

Technical Data

Bourdon tube pressure gauge: -1...24bar
Temperature limiter: 200°C 
Safety valve: 20bar
Heater: 2kW
Boiler, stainless steel: 2L
Measuring ranges
- temperature: 0...250°C
- pressure: 0...20bar

Dimensions and Weight

LxWxH: 600x400x680mm
Weight: approx. 35kg
Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase

Scope of Delivery

1 experimental unit
1 funnel
1 set of tools
1 set of instructional material

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