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Effects of Temperature on the Accuracy of Aqueous Engine Coolant Freezing Point Determination by Refractometer
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Abstract
The refractive index of ethylene and propylene glycol-based coolants is directly proportional to the concentration/freezing point of coolant in aqueous solution. A complicating factor in concentration measurement by refractive index is the temperature dependence of this physical property. The degree of change in refractive index due to changes in temperature is also concentration dependent. Accurate measurements require temperature equilibration between the refractometer, sample and environment. A refractometer which is able to sense temperature and automatically apply a correction factor greatly increases accuracy.
Data showing the effect of temperature on a range of concentrations of commercial coolants aid pure ethylene and propylene glycol solutions is presented. The method and means of automatic temperature compensation necessary for obtaining the highest degree of accuracy are described.
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Ryan, T., "Effects of Temperature on the Accuracy of Aqueous Engine Coolant Freezing Point Determination by Refractometer," SAE Technical Paper 930477, 1993, https://doi.org/10.4271/930477.Also In
References
- Karasek, F. W. “Rebirth of the Refractometer.” Research and Development May 1970 63 68
- Hudgens, R. Douglas Bugelski W.G. “Analysis of Coolants from Diesel Engines.” Technical Paper Series. 900435 1990 Society of Automotive Engineers Warrendale, PA 15096
- Cooling System Coolant/SCA Maintenance 1992 Cummins Engine Company Inc. Columbus, IN 47202
- Standard Practice for the Use of the Refractometer for Determining the Freezing Point of Aqueous Engine Coolants Annual Book of ASTM Standards 15 05 1992
- Skoog, Douglas A. West Donald M. “Miscellaneous Optical Methods, Refractometry.” Principles of Instrumental Analysis 1980 353 356 Holt, Rinehart and Winston
- Beal, Roy E. Engine Coolants and ASTM Subcommittee D-15 Standardization News July 1991 58 63
- Proceedings of the International Commission for Uniform Methods of Sugar Analysis Ankara 1974 144 156
- Leica Technical Bulletin “Two Point Calibration of the Duo-Chek Refractometer.” Leica Inc. Buffalo. N.Y. 1992
- Standard Specification for ASTM Reference Coolant Annual Book of ASTM Standards 15 05 1992 126 128
- Specification For Hydrometer-Thermometer Field Tester for Engine Coolants Annual Book of ASTM Standards 15 05 1992 20 23