Patent ID: 7832222

Claim:
A refrigerant recovery unit that adjusts a chemical composition of refrigerant recovered from a refrigerant system, comprising: a first container for holding a supply of refrigerant having a first refrigerant composition; a second container for holding a supply of refrigerant having a second refrigerant composition, wherein said second container is arranged in fluid communication with said first container so the refrigerant can be transferred from said second container to said first container; a controller for controlling the transfer of the refrigerant from said second container to said first container; and a composition analyzing device operatively engaged with said first container and with said controller and configured to analyze the chemical composition of the refrigerant in said first container and to send a signal to said controller indicating said first refrigerant chemical composition, and said controller in response to the signal is operable to transfer refrigerant from said second container to said first container so that the first refrigerant composition approaches a target composition.