Device and method for detecting by measurement fire-like events, and system for eliminating a hazardous state cause by a fire-like event

An apparatus for metrological detection of a fire-like phenomenon, namely a spark, flame or embers or hot particle phenomenon in a reservoir through which media flows or which is loaded with media, comprising a measurement arrangement configured to record measurement data, the measurement arrangement comprising a first and a second measuring unit for the detection of electromagnetic radiation emitted by the fire-like phenomenon in a first or second wavelength range, respectively, and further comprising a computing circuit that is configured to check at a current time point (tA) on the basis of stored medium or environment specific characteristic data, whether an adjustment criterion (A) is satisfied, the apparatus further comprising a calculation means that is part of the computing circuit or is connected to this by signal technology, wherein the calculation means is configured to calculate, on the basis of stored medium- or environment-specific characteristic data, a probability value for the presence of a radiation absorption of the electromagnetic radiation emitted by a fire-like phenomenon by the medium, wherein the adjustment criterion (A) is a predefined probability value or a probability value range, wherein the computing circuit is configured to check whether the calculated probability value agrees with the predefined probability value or lies in the predefined probability value range, wherein in the case of a positive determination in this respect, the adjustment criterion (A) is satisfied and a control circuit is configured:

• alto switch off the second measuring unit, b) to weaken a measurement sensitivity (M2) of the second measuring unit and c) to increase a measurement sensitivity (M1) of the first measuring unit and d) to adjust, in particular to decrease a threshold value for triggering a danger signal stored in relation to the first measuring unit.