A control system for a home ambulatory liquid oxygen system having an
oxygen concentrator, condenser, cryocooler, a heater and a storage dewar,
includes an oxygen concentration sensor which senses the concentration of
oxygen gas generated by the oxygen concentrator and generates a first
signal in response thereto; a liquid level sensor which senses the liquid
level in the dewar and generates a second signal in response thereto; a
temperature sensor which senses the temperature in the dewar and generates
a third signal in response thereto; and a microprocessor for receiving the
first, second and third signals for computing the flow concentration of
gaseous oxygen out of the concentrator and into the condenser, the level
of liquid oxygen in the dewar, the temperature in the dewar and for
controlling the transfer of liquid oxygen from the storage dewar.
