Measuring and testing – Gas content of a liquid or a solid – Of a liquid
Patent
1995-07-05
1997-06-03
Chilcot, Richard
Measuring and testing
Gas content of a liquid or a solid
Of a liquid
123196R, 123196S, G01N 3326, F01M 100
Patent
active
056356250
ABSTRACT:
An oil changer comprises at least piping 5, 9, 10, along which an oil pump 12 and switching valves 8a, 8b are disposed, and first and second oil reservoirs 3, and 4. Used oil in an oil use location is recovered into the oil reservoir 4 via the piping, while unused oil in the first oil reservoir 3 is supplied into the oil use location via the piping. In this case, a flowmeter 11 for measuring an oil flow rate, as well as air sensors 6a, 6b for detecting the existence of air in used and/or unused oil when the air happens to exist in a flow of the used or unused oil and for outputting a predetermined signal, are provided at intermediate positions along the length of the piping 5, 9, and 10. Furthermore, a control section is provided into which the flow rate signal from the flowmeter 11 is inputted and which normally counts the number of the flow rate signals, but does not count them when the predetermined signal is inputted. Thus, as measurement error which would otherwise occur when air happens to be mixed into oil can be avoided, it is possible to measure, by means of the flowmeter and with high accuracy, the oil flow rate of the oil to be exchanged.
REFERENCES:
patent: 4421078 (1983-12-01), Hurner
patent: 4508195 (1985-04-01), Millet
patent: 4674456 (1987-06-01), Merritt
patent: 5209198 (1993-05-01), Bedi
patent: 5372219 (1994-12-01), Peralta
patent: 5487447 (1996-01-01), Martinez Velazquez
Chilcot Richard
Noori Max H.
Yamada Corporation
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