Document Revision: ERAVAP_a-8018 9
3 Measuring principle
ERAVAP measured the vapor pressure of liquid materials. By definition, the vapor pressure,
or equilibrium vapor pressure is the pressure, extorted by a vapor in thermodynamic
equilibrium with its condensed phases at a given temperature in a closed system.
Within a measurement, the following parameters are controlled, pre-defined or measured:
• V/L ratio
As for of the filling parameters, the amount of liquid sample related to the total volume of
the measuring cell is adjusted, or pre-defined by the used method.
• Measuring time
In order to ensure that the liquid and vapor phases are in a stable equilibrium state a
measuring time is specified.
• Temperature
As the vapor pressure is a function of the temperature, this parameter is pre-defined and
monitored, ensuring that the measuring cell is temperature regulated.
• Pressure
For most common methods the pressure in the measuring cell is determined.
To Next Page
Loading...