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The Environics® Series 6202, Reduced Oxygen Breathing Device 2 (ROBD 2), is a portable computerized gas-blending instrument used to produce hypoxia without changes in atmospheric pressure. This simulated altitude exposure can be utilized for both research and training purposes. The
U. S. Navy currently uses the ROBD 2 to train aircrew to recognize the signs and symptoms of hypoxia and to perform the appropriate emergency procedures and additionally, conducts hypoxia research.

The ROBD 2 uses Thermal Mass Flow Controllers (MFC) to mix breathing air and nitrogen to produce the sea level equivalent atmospheric oxygen contents for altitudes up to 34,000 feet. RODB 2The MFC’s are calibrated on a primary flow standard traceable to the National Institute of Standards and Technology (NIST). The ROBD 2 introduces pressure changes and gas expansion as a function of altitude. Several safety features are built into the device: prevention of over pressurization of the subject’s mask, prevention of reduced oxygen contents below those being requested for a particular altitude and an emergency dump switch that will supply 100% O2 to subjects. The software is menu driven. The main operators menu consists of three selections, simplifying the use of the system for the field operator. Built-in self-tests verify all system component functionality before the operation of the system can begin. If any self-test fails the system will not operate. The system is designed to work with both bottled gases and gases produced by a Nitrogen/air generator (available separately).