Patent ID: 8069731

Claim:
A service gauge for determining refrigerant pressure of a refrigerant in a refrigerant line and for determining other parameters relating to the refrigerant in the refrigerant line comprising: a. a pressure sensor connected to refrigerant line for producing an electronic pressure signal proportional to the refrigerant pressure of the refrigerant in the refrigerant line, wherein the pressure sensor comprises: i. a bourdon tube connected to the refrigerant line and operatively connected to a magnet attached to the bourdon tube so that the magnet moves in response to the straightening and curling of the bourdon tube in response to changing pressure in the refrigerant line; ii. a position sensor positioned adjacent to, but not in contact with the magnet, which position sensor determines the straightening or curling position of the bourdon tube and produces the electronic pressure signal that is proportional to the refrigerant pressure; b. a microprocessor for receiving the electronic pressure signal and programmed to calculate an auxiliary parameter relating to the refrigerant pressure from the electronic pressure signal; and c. a display connected to the microprocessor for showing the calculated auxiliary parameter.