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ANSI/ASHRAE Standard 41.4-2015
Standard Method for Measuring the Proportion of Lubricant in Liquid Refrigerant
Uses the gravimetric method as the primary method, but alternative methods can be used if those methods are calibrated against the primary method. This standard does not apply to collected samples that contain less than 0.001 g (0.015 grains) of lubricant.
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American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ashrae]
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ashrae]