Fire dector including a non-volatile memory

Claim 1

A fire detector (1) comprising: a CPU (2) including a non-volatile memory (2a) in which a code is recorded representative of at least one characteristic element specific to said fire detector; and a fire sensor (3) that measures a physical magnitude whose variation serves to detect the existence of a fire in the vicinity of the fire detector, said fire sensor delivering an analog electrical signal (i) referred to as a "measurement" signal to the CPU (2), the value of the measurement signal being representative of the physical magnitude measured by the fire sensor, the above-mentioned characteristic element including a normal value iO for the measurement signal in the absence of a fire; the detector being characterized in that: the fire detector further includes interface means (5, 6) giving access to the contents of the non-volatile memory (2a) without dismantling the fire detector; the non-volatile memory (2a) further includes dates on which maintenance operations of said fire detector have been performed; and the CPU (2) is programmed to compare the measurement signal (i) with the normal value iO of the measurement signal on each occasion that it receives an instruction from the interface means (5, 6) to record a maintenance date, and to refuse to record it whenever the measurement signal (i) does not lie within the range iO-Δ1 to iO+Δ2, where Δ1 and Δ2 are predetermined values.