PROBLEM TO BE SOLVED: To provide a configuration for adjusting the composition of air in the internal space of a storage by a CA device to solve such problems as an operator opening a door of the storage or entering the internal space without checking concentrations of oxygen and carbon dioxide in the air inside the storage when an oxygen sensor or a carbon dioxide sensor breaks down.SOLUTION: A concentration sensor 33 such as an oxygen sensor 33a and a carbon dioxide sensor 33b is arranged outside a storage 10, and an air passage 48 for concentration detection is provided between the internal space of the storage and the concentration sensor 33.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT
