Method of controlling a gas absorption apparatus for producing a breathable gas supply in an aircraft

摘要

A method of controlling a gas adsorption apparatus 10 of the kind including a sieve bed 11; 12 containing molecular sieve bed material, the bed 11; 12 being cyclically operable in a charge mode to adsorb non-product gas from an air supply S thereby to increase the concentration of a product gas in a product gas supply which passes to a product gas line 15; 16 and in a vent mode to desorb the adsorbed non-product gas which passes to a non-product gas line 17, and there being a passage 18 to permit a restricted amount only of the product gas supply to pass from the product gas supply line 15; 16 to the bed when operating in vent mode, and characterised in that the method includes operating a variable flow device 22 to permit an increased amount of the product gas supply to pass to the bed 11; 12 when operating in vent mode, under predetermined conditions. <IMAGE>