Fire detector having unheated thermistors for capturing thermal fluctuations in the region of the inlet openings

Abstract

Some embodiments include a fire detector configured to capture a fire parameter and to output a fire alarm. An example comprises a housing with inlet openings and thermistors, in particular NTCs, arranged in the region of the inlet openings. The fire detector comprises a control unit connected to the thermistors for capturing temperature measurement signals. The control unit is configured for this if the (average) signal bandwidth of signal fluctuations in at least one of the captured temperature measurement signals, or in all the temperature measurement signals, falls below a value of 30 mK, in particular 20 mK, or 15 mK, for a minimum length of time. Reasons for the absence of thermal fluctuations may be contamination in the region of the inlet openings or because the inlet openings are covered by a protective hood or by an adhesive tape.

Dependencies are inferred from the claim text.