| 摘要 |
PROBLEM TO BE SOLVED: To perform calibration of an oxygen sensor for measuring oxygen concentration of inside air at arbitrary timing in a short time, in a refrigeration device for a container which adjusts the temperature and composition of the air inside a container to a desired state.SOLUTION: A gas supply device (30) is constituted so as to be switched between a first supply state for generating nitrogen concentration air from the outside air and for supplying it to the inside of a container (11) as supply air, and a second supply state for supplying the taken-in outside air to the inside of the container (11) as the supply air. In a CA device (60), a branch pipe (81) for guiding at least one part of the supply air flowing in a supply passage (44) to an oxygen sensor (51), and an opening/closing valve (82) for opening/closing the branch pipe (81) are provided. In the second supply state, the opening/closing valve (82) is opened, at least one part of the outside air flowing in the supply passage (44) is guided to the oxygen sensor (51), and an outside air calibration operation is performed for calibrating the oxygen sensor (51) by the outside air.SELECTED DRAWING: Figure 4 |
