GASEOUS ATMOSPHERE CONTROL DEVICE
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Abstract
A CONTROL SYSTEM FOR MAINTAINING THE COMPOSITION AND PRESSURE OF A GAS MIXTURE INCLUDING OXYGEN AT A PREDETERMINED TOTAL PRESSURE IN A CHAMBER AND SIMULTANEOUSLY MAINTAINING THE PARTIAL PRESSURE OF AT LEAST THE OXYGEN AT A PREDETERMINED LEVEL RELATIVE TO THE TOTAL PRESSURE OF THE MIXTURE. THE CONTROL SYSTEM IS CAPABLE OF PREFERENTIALLY SUPPLYING OXYGEN FROM A SOURCE TO THE CHAMBER WHENEVER THE OXYGEN PARTIAL PRESSURE IS BELOW THE PREDETERMINED LEVEL AND SUPPLYING A SECOND GAS FROM A SOURCE WHEN THE TOTAL PRESSURE
IS BELOW THE PREDETERMINED LEVEL WHILE THE OXYGEN IS AT THE PREDETERMINED PARTIAL PRESSURE LEVEL.
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