Self-checking condition responsive system

Claim 1

A COMBUSTION SUPERVISION SYSTEM COMPRISING A FLAME SENSOR FOR DISPOSITION IN SUPERVISING RELATION TO A COMBUSTION CHAMBER, A FLAME RELAY COUPLED TO SAID FLAME SENSOR FOR PRODUCING A SIGNAL INDICATIVE OF THE PRESENCE OF FLAME IN SAID COMBUSTION CHAMBER, CONTROL MEANS TO CAUSE SAID FLAME SENSOR TO INDICATE FLAME FAILURE, AN ELECTRICALLY OPERABLE COMBUSTION CONTROL DEVICE, COUPLING MEANS CONTROLLING THE ENERGIZATION OF SAID COMBUSTION CONTROL DEVICE, CYCLICALLY OPERATIVE CHECKING MEANS GENERATING A MAJOR CYCLE SIGNAL AND A PLURALITY OF MINOR CYCLE SIGNALS WITHIN SAID MAJOR CYCLE, EACH SAID MINOR CYCLE BEING OF SHORTER DURATION THAN SAID MAJOR CYCLE, MEANS TO APPLY SAID MINOR CYCLE SIGNALS TO SAID COUPLING MEANS TO ENERGIZE SAID COMBUSTION CONTROL DEVICE, MEANS TO APPLY SAID MAJOR CYCLE SIGNALS TO SAID CONTROL MEANS TO PRODUCE A SIMULATED FLAME FAILURE CONDITION, AND MEANS RESPONSIVE TO SAID FLAME RELAY TO DISABLE SAID COUPLING MEANS.