Patent ID: 7997122

Claim:
An analyzer for measuring the vapor pressure of a hydrocarbon liquid, the analyzer comprising: a pressure measuring system comprising: a measuring cell for holding the hydrocarbon liquid; and a pressure sensor for measuring the pressure within the measuring cell; and an air saturation system connected to the pressure measuring system and operable to provide the hydrocarbon liquid to the measuring cell, the air saturation system comprising: first and second chambers, each having first and second openings; a pump operable to move the hydrocarbon liquid back and forth between the first and second chambers so as to saturate the hydrocarbon liquid with air, the pump comprising a plunger disposed in the first chamber and being movable between first and second positions within the first chamber, the plunger being disposed between the first and second openings of the first chamber; a first circulation line with a circulation valve connected therein, the first circulation line connecting the first opening of the first chamber to the first opening of the second chamber; a second circulation line connecting the second opening of the first chamber to the second opening of the second chamber; an inlet line with an inlet valve connected therein, the inlet line being connected to a source of the hydrocarbon liquid; an outlet line with an outlet valve connected therein, the outlet line being connected to the pressure measuring system; and an input/output line connecting the inlet line, the outlet line and the circulation line to the first opening of the first chamber.