Oxygen concentrator apparatus configured for high altitude use

An oxygen concentrator apparatus, comprising:

• at least two canisters;
• gas separation adsorbent disposed in at least two canisters, wherein the gas separation adsorbent separates at least some nitrogen from air in the canister to produce oxygen enriched gas;
• a compression system coupled to at least one canister, wherein the compression system compresses air during operation;
• a pressure sensor capable of detecting an ambient pressure of the apparatus during use, wherein operation of the compression system is based, at least in part, on the pressure detected by the pressure sensor.

A method of providing oxygen to a user of an oxygen concentrator, the oxygen concentrator comprising:

• at least two canisters;
• gas separation adsorbent disposed in at least two canisters, wherein the gas separation adsorbent separates at least some nitrogen from air in the canister to produce oxygen enriched gas;
• a compression system coupled to at least one canister;
• and
• a pressure sensor;
• the method comprising:
• assessing an ambient pressure with the pressure sensor;
• operating the compression system to compress air, wherein the operation of the compression system is based, at least in part, on the assessed ambient pressure;
• directing the compressed air into one or more of the canisters, wherein nitrogen is separated from oxygen in one or more of the canisters to produce oxygen enriched gas;
• and
• providing the oxygen enriched gas to the user.