Patent ID: 7395694

Claim:
A device ( 1 ), for determining the density and air content of an oil sample, the device comprising: an oil circuit comprising: a pump ( 4 ) and pipe lines ( 5 ) for conducting the oil sample through the oil circuit; an air delivery port ( 6 ) for introducing air into the oil circuit; an air-oil mixer ( 2 ) where the air mixes with the oil; a venturi pipe ( 9 ); a first oil pressure sampling orifice on an upstream side of the venturi pipe and a second oil pressure sampling orifice on a downstream side of the venturi pipe; a differential pressure sensor ( 3 ) connected to the first and second oil sampling orifices; and wherein the oil sample is delivered to the venturi pipe at a known flow rate, a pressure differential of the oil sample across the venturi pipe ( 9 ) is measured by the differential pressure sensor ( 3 ) connected with the first and second oil pressure sampling orifices and, based on the known flow rate of the oil sample through the venturi pipe ( 9 ) the density of the oil sample is proportionally determined from the pressure differential across the venturi pipe and consequently the air content of the oil is determined.