Apparatus for identifying and distinguishing different refrigera

Details Apparatus for identifying and distinguishing different refrigera Apparatus for identifying and distinguishing different refrigera

1993-04-12

1994-03-22

Tanner, Harry B.

Refrigeration

With indicator or tester

Diverse function indicators or testers

62292, 73 2503, G01N 2500

Patent

active

052953602

ABSTRACT:
Apparatus for identifying and distinguishing between at least two types of refrigerant that includes a fixed volume for containing a refrigerant sample at controlled vapor pressure. A thermistor provides a first electrical signal as a function of the combined effect of thermal conductivity and temperature of a refrigerant sample in the sample-containing volume, and a temperature sensor provides a second electrical signal as a function of temperature of the refrigerant vapor in the sample-containing volume essentially independent of thermal conductivity thereof. Associated electronics determines type of refrigerant in the sample-containing volume as a function of the first and second electrical signals, and thus as a function of thermal conductivity of the refrigerant sample independent of sample temperature. Since thermal conductivity of refrigerants at a given temperature and pressure varies for different refrigerant types, refrigerant type can be determined and displayed to an operator.

REFERENCES:
patent: 4768347 (1988-09-01), Manz et al.
patent: 4805416 (1989-02-01), Manz et al.
patent: 4878356 (1989-11-01), Punches et al.
patent: 4939905 (1990-07-01), Manz
patent: 4970891 (1990-11-01), Blevins et al.
patent: 5158747 (1992-10-01), Manz et al.
patent: 5237873 (1993-08-01), Eichenlaub

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