PROBLEM TO BE SOLVED: To enable detection of failure in a gas supply device without increasing manufacturing cost, in a refrigeration device for a container which adjusts oxygen concentration of inside air of a container by including the gas supply device of nitrogen concentration air.SOLUTION: A refrigeration device (10) for a container for cooling air inside a container (11) includes: a gas supply device (30) for generating nitrogen concentration air in which nitrogen concentration is higher than that of outside air and for supplying it to the inside of the container (11) via a supply passage (44) an oxygen concentration sensor (51) for measuring oxygen concentration of the inside air and a control unit for controlling an operation of the gas supply device (30) so that the oxygen concentration measured by the oxygen concentration sensor (51) becomes target concentration. In the refrigeration device (10) for a container, a passage (88) for measurement is provided for guiding one part of nitrogen concentration air flowing in the supply passage (44) to the oxygen concentration sensor (51), and an on-off valve (82) is provided at the passage (88) for measurement.COPYRIGHT: (C)2016,JPO&INPIT【課題】窒素濃縮空気のガス供給装置を備えてコンテナの庫内空気の酸素濃度を調節するコンテナ用冷凍装置において、製造コストを増大させることなくガス供給装置の不具合を検知可能にする。【解決手段】コンテナ(11)の庫内空気を冷却するコンテナ用冷凍装置(10)は、外気よりも窒素濃度の高い窒素濃縮空気を生成し、供給通路(44)を介してコンテナ(11)の庫内に供給するガス供給装置(30)と、庫内空気の酸素濃度を測定する酸素濃度センサ(51)と、該酸素濃度センサ(51)によって測定された酸素濃度が目標濃度となるようにガス供給装置(30)の運転を制御する制御部とを備えている。上記コンテナ用冷凍装置(10)に、供給通路(44)を流れる窒素濃縮空気の一部を酸素濃度センサ(51)へ導く測定用通路(88)を設け、該測定用通路(88)に開閉弁(82)を設ける。【選択図】図2
