Liquid Oxygen Systems
Liquid oxygen systems are frequently prescribed for individuals who are mobile and active outside their homes. In its liquid state, oxygen takes up less space and can be stored at much lower pressures than when in its gaseous state. This means more oxygen can be carried in a portable liquid unit, and the portable container is much lighter in weight than an oxygen gas cylinder.
Liquid oxygen systems consist of a stationary unit or reservoir which stores a large volume of liquid oxygen and a portable unit which can be refilled from the reservoir. When you are at home, you will probably use the stationary unit as your source of oxygen. But, for exercise or other activities outside your home, or within the home out of reach of your stationary source, you can fill the portable unit and be free to go wherever you choose.
To remain in a liquid form, oxygen must be stored at approximately minus 300 degrees F. For this reason the reservoir and the portable unit are actually large thermos containers. When you turn ON the oxygen, the liquid warms as it leaves the container, changes to gas, and is supplied at room temperature for you to breathe.
