Scope The instrument conforms to the standard ASTM D323, ISO3007, GB/T8017, NFM07007. The instrument is suitable for measuring the vapor pressure of gasoline and other volatile petroleum products, and it is not suitable for the detection of vapor pressure of liquefied petroleum gas. The instrument is used to charge the cooled sample into the gas chamber of the vapor pressure measuring device, and the gas chamber is connected with the air of a certain temperature.