This content is not included in your SAE MOBILUS subscription, or you are not logged in.
The Real Time Oil Concentration Measurement in Automotive Air Conditioning By Ultraviolet Light Absorption
Published October 17, 1990 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
Real time measurement of oil concentration to refrigerant was developed by using ultraviolet light absorption at the liquid line. The light wavelengths were selected from 200 nm to 370 nm considering ultraviolet light absorption sensitivity to oil and refrigerants (CFC12, HFC134a). Measuring errors were investigated on the influence of temperature, pressure and contaminants. The density changes of refrigerants were compensated. The uncertainties of this measurement were ±0.1 weight percent at 1.0 weight percent concentration. This measurement was applied to automotive air conditioner at a transient state.