Quantitative determination of air present in refrigerant sample

Details Quantitative determination of air present in refrigerant sample Quantitative determination of air present in refrigerant sample

1994-02-02

1996-06-11

Williams, Hezron E.

Measuring and testing

Gas analysis

By vibration

73 2401, 73579, G01N 2912

Patent

active

055244777

ABSTRACT:
An acoustic technique is employed to identify the species of a refrigerant gas and whether it contains significant contaminants. Air in the refrigerant can be tolerated, but must be accounted for in determining the acoustic properties of the sample. The refrigerant is admitted into a Helmholtz resonator under a controlled pressure, and a drive frequency is applied to a transducer. Another transducer picks up the vibrations in the resonator and an output signal is compared to the drive signal to find resonant peaks and sharpness factors. The change in resonant frequency with pressure is measured, and is employed to quantify the presence of air in the sample. The amount of air present determines a frequency correction, which permits unambiguous identification of the species of refrigerant and of its purity.

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