System for controlling and sensing ethylene concentration in a controlled atmosphere storage and transport environment

System for detecting and reducing ethylene (1) in a storage room (2) or a reefer container (2), the system (1) comprising:

• a sensing reaction chamber (10) and an ethylene/ozone reaction chamber (19) in fluid communication with the storage room (2), in which ozone and air from the storage room (2), potentially ethylene containing, is brought into reaction with each other,
• an ozone generator (6) for supplying ozone into the sensing reaction chamber (10) and the ethylene/ozone reaction chamber (19),
• light detecting means (8) for detecting light emitted via reaction between the ozone and ethylene, said light detection means producing detection signals (12),
• processing means (9) for processing the signals (12) from the light detection means and producing feedback signals (13, 34, 35),
• airstream means (4) for forcing an airstream from the storage room (2) or reefer container (2) through the system (1),
• characterised in that, the system (1) is adapted such that ozone excessive from the reaction between the ozone and the ethylene in the sensing reaction chamber (10) with the light detection means (8) is lead into the airstream to the ethylene/ozone reaction chamber (19), and that the ozone generator (6) is controlled by the feedback signal (13).