Using compressed air, this instrument can create an environment having air pressures between 0～0.5MPa. It is used for performance tests involving underwater equipment. The instrument consists of primary and secondary compartments. Operation of the primary room is independent of the secondary room. Valves outside the rooms control compression and decompression.
For safe operation, two small TV cameras are installed inside, and the inner compartments can be monitored from outside. The external monitor may not be removed from the center's facilities for outside use.

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