Patent ID: 6688308
Filing Date: 2004-02-10
Classification: A62B,B64D

Abstract:
An aircraft oxygen supply system equipped for performance testing of the system, comprising:an oxygen supply device adapted to supply oxygen in varying concentrations within a product gas in response to control signals generated according to demand; a monitoring means to monitor the concentration of oxygen in the product gas; and a control means responsive to the monitoring means to provide the control signals to the oxygen supply device said control means programmed to provide, at predetermined intervals, a predetermined performance test control signal to the oxygen supply device which is expected to respond by supplying control data including a corresponding known test concentration or a known partial pressure of oxygen in the product gas, and the control means being adapted in normal use to provide a control signal to the oxygen supply device in response to the monitoring means and control data, the control signal being determined by the control means to cause the oxygen supply device to supply oxygen at a concentration or partial pressure in the product gas appropriate to a demand for the specific fluid indicated by the control data; said monitoring means programmed to monitor the known test concentration or the known partial pressure of oxygen supplied by the oxygen supply device in response to the predetermined performance test control signal, and further programed to determine if the known test concentration or the known partial pressure of oxygen supplied by the oxygen supply device is as expected in view of the predetermined performance test control signal, and if the known test concentration or partial pressure of oxygen supplied by the oxygen supply device is not as expected in view of the predetermined performance test control signal, said monitoring means programmed to provide an alarm indication.