Oxygen / Nitrogen (O2 / N2) Control
The Pressure Control Panel monitors the Space Station cabin’s atmospheric pressure. This device is regulated by computers.

The
Nitrogen Replenishment System consists of pressurized tanks of Nitrogen with electrically and manually controlled valves. The Nitrogen is shipped to the Space Station on the Shuttle.

The
Atmosphere control and Supply Subsystem specifically monitors the amount of Nitrogen and Oxygen in the Space Station’s air. Reports are sent to the Major Constituent Analyzer.

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