Patent ID: 7008217
Filing Date: 2006-03-07
Classification: F23N

Abstract:
1. A safety device for an industrial boiler (CHA), said device comprising electromechanical relays (RE n , RS) connected in series to form an electromechanical safety chain (CH1) and at least one normally open shunt relay (RT n ) that is connected in parallel with one of said electromechanical relays (RE n ) and is controlled by an automatic controller (API) so that it is closed for a time delay duration, which device is characterized in that said shunt relay (RT n ) has a contact connected to an electronic circuit (CE n ) and said electronic circuit (CE n ) controls opening of an electromechanical relay (RS) connected in series in the safety chain in the event of closure of said shunt relay (RT n ) for a duration exceeding said time delay duration.