Pressure differential gage and a method for detecting the presence of noncondensible gases in a refrigeration system

摘要

A pressure differential gage and a method for detecting the presence of noncondensible gases in a refrigeration system. The pressure differential gage comprises a housing, a diaphragm, first and second tubes, a reference fluid, and indicator means. The diaphragm separates the housing into first and second chambers. The first tube has one end in fluid communication with the first chamber and a second end open to receive a sample vapor, which determines the pressure in the first chamber. The second tube has one end in fluid communication with the second chamber and a closed second end. The reference fluid is located in the second tube and determines the pressure in the second chamber. The indicator means is actuated by the diaphragm to indicate when the pressure in the first chamber differs from the pressure in the second chamber.