KALIBRERING AF KØLEMIDDELMÆTNINGSTEMPERATUR I ET KØLESYSTEM

The invention relates to a method of determining a refrigerant or a composition of refrigerants in a refrigeration system (1) comprising an expansion valve (2), an evaporator (3), one or more evaporator fans (4), a condenser (5), one or more condenser fans (6) one or more temperature sensors (7), one or more pressure sensors (8), a compressor (9), and a controller (25) for controlling the refrigeration system (1), the controller (25) comprising a memory (26), the expansion valve (2), the evaporator (3) and the compressor (6) being fluidly interconnected in a refrigerant path (10) having refrigerant flowing therein, comprising the steps of: a) Running a test run and read out values from one or more of the sensors (7, 8); b) Determining a composition by the result of step a; and c) Adjusting the refrigeration system (1) in relation to the composition determined by step b. The invention further relates to a controller (25) for controlling a refrigeration system (1) and to a cooling machine in a reefer container.