Seatronics Company, Inc.

Rexnord Gmbh

Seatronics, Inc.

Rampart Corporation

Mark P Grady

Frederick A Parker

Temperature activated alarm for fire fighters

Oxygen sensor

The present invention is an oxygen sensor, having the form of an electrochemical cell, of the galvanometric type. Oxygen from the outside environment enters the cell through a gas-permeable liquid-impermeable membrane, and supports an electrochemical reaction which generates an electric current. The amount of current produced is proportional to the amount of oxygen entering the cell. The cathode of the cell is a flat, perforated gold disk, and the connection between the cathode and an external terminal is made with a spring which is compressed between the terminal and the cathode. In order to seal the cell against leakage of liquid, the cathode is enclosed within an O-ring, and the membrane is placed directly over the cathode and O-ring combination. In an alternative embodiment, suitable for use in high-pressure environments, the cell is provided with an expansion diaphragm. In the latter embodiment, the sealing is accomplished by laying the membrane over the cathode, and placing a separate disk, surrounded by a gasket, over the membrane.

A compact, light and highly efficient gas regenerator unit for a positive pressure closed circuit rebreathing apparatus having an improved carbon dioxide scrubber contained within an annular frame to the lower open portion of which a spring loaded flexible diaphragm is sealingly connected around its periphery and across the upper portion of which a cover plate is releasably attachable with the interior of the unit within the frame being divided by a transversely extending partition into a gas conditioning chamber, in which the CO.sub.2 of the wearer's expelled breath gases are removed by passing through chemicals compressively retained in the canister of a scrubber extending across the span of the gas conditioning chamber, and a variable volume gas chamber above diaphragm from which the reconditioned gases that have been enriched with a predetermined amount of oxygen are again inhaled. A valving arrangement operated by movement of the spring loaded diaphragm will maintain a positive pressure within the system and add additional oxygen to the variable volume chamber when excess oxygen is being consumed by the wearer or vent excess gases from the chamber when oxygen consumption decreases. An anti-anoxia valve prevents the wearer from breathing into the unit until oxygen is being released into the unit. The design of the reconditioning gas chambers and passages, including the CO.sub.2 scrubber, establishes a uniform flow of breathing gases through the scrubber and the unit with a minimum pressure drop.

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Norristown, PA, United States of America

Mark P Grady