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Air is the most common and only natural breathing gas, but other mixtures of gases, or pure oxygen, are also used in breathing equipment and enclosed habitats Oxygen is the essential component for any breathing gas, at a partial pressure of between roughly 0.16 and 1.60 bar at the ambient pressure. [8] [9] [10] breathing helmet 1.
The Lambertsen Amphibious Respiratory Unit (LARU) is an early model of closed circuit oxygen rebreather used by military frogmen. Christian J. Lambertsen designed a series of them in the US in 1940 (patent filing date: 16 Dec 1940) and in 1944 (issue date: 2 May 1944). [1]
Aeris brand covered a wide range of recreational scuba equipment, including regulators, dive computers, buoyancy compensators, harnesses, masks, fins, and snorkels. [2] Aerotec Industries Inc. Norseman scuba regulators. [3] Aer-Sub, also known as Spiro-Sub – Branding used by Cressi-Sub for scuba equipment Trademarks used by Cressi-sub. [4]
Underwater breathing apparatus can be classified as open circuit, semi-closed circuit, (including gas extenders) or closed circuit (including reclaim systems), based on whether any of the exhaled gas is recycled, and as self-contained or remotely supplied (usually surface-supplied, but also possibly from a lock-out submersible or an underwater habitat), depending on where the source of the ...
A sodium chlorate oxygen candle in the base of the unit generates oxygen on start-up as the canister has to reach a high internal temperature before it will start generating oxygen. The circulation of exhaled air containing carbon dioxide through the canister starts the chemical process, usually taking less than five minutes to reach a stable ...
This class of device can also be used with portable oxygen concentrators, making them more efficient. [43] A pulse dose oxygen conserving device, (or demand pulse device) senses the start of inhalation and provides a metered bolus, which, if correctly matched to requirements, will be sufficient and effectively inhaled into the alveoli. Such ...