Patent ID: 8084723

Claim:
A method for detecting a fire condition in a cooking chamber of a baking oven, comprising: measuring an oxygen concentration in the baking oven; determining a rate of change of the oxygen concentration in an evaluation circuit of an electronic controller of the baking oven; comparing the measured oxygen concentration and the determined rate of change of the oxygen concentration to respective predetermined limit values stored in a memory of the electronic controller; detecting a fire condition when the measured oxygen concentration reaches a value smaller than a first limit of the predetermined limit values and at the same time when the determined rate of change of the oxygen concentration exceeds a second limit of the predetermined limit values, the first limit being in a range of 15 to 20 percent by volume, the second limit being a rate of decrease limit being of about 2.5 percent by volume per 10 seconds; and upon the detecting of the fire condition, providing an alarm.