A method for estimating a sensitivity of a detector device for a non-acoustic physical parameter such as e.g. a gas leakage rate in liters/hour of a physical phenomenon that produces a spatially limited sound emission in a particular environment, using a detector device comprising: a transducer array comprising a plurality of electro-acoustic transducers, each transducer being arranged to measure a physical parameter related to sound or ultrasound; and processing means arranged so as to be able to locate a possible source of sound emission from a plurality of signals measured by the plurality of transducers of the array; said method for estimating the sensitivity comprising the steps of: a) receiving a plurality of electrical signals from said plurality of transducers of the transducer array, said array being placed within said environment; b) estimating ( 205, 206, 207, 208, 211, 209, 210) from the plurality of electrical signals received in step a) an acoustic detection threshold value of a spatially limited source sound emission parameter detectable by the detector device in said environment; c) converting the acoustic detection threshold value estimated in step b) into a non-acoustic quantity representative of a magnitude of the physical phenomenon that the detector device is capable to detect in said environment; d) displaying the non-acoustic quantity estimated in step c) as the sensitivity of the detector device for said physical parameter in that particular environment. using a detector device comprising: a transducer array comprising a plurality of electro-acoustic transducers, each transducer being arranged to measure a physical parameter related to sound or ultrasound; and processing means arranged so as to be able to locate a possible source of sound emission from a plurality of signals measured by the plurality of transducers of the array; said method for estimating the sensitivity comprising the steps of: a) receiving a plurality of electrical signals from said plurality of transducers of the transducer array, said array being placed within said environment; b) estimating ( 205, 206, 207, 208, 211, 209, 210) from the plurality of electrical signals received in step a) an acoustic detection threshold value of a spatially limited source sound emission parameter detectable by the detector device in said environment; c) converting the acoustic detection threshold value estimated in step b) into a non-acoustic quantity representative of a magnitude of the physical phenomenon that the detector device is capable to detect in said environment; d) displaying the non-acoustic quantity estimated in step c) as the sensitivity of the detector device for said physical parameter in that particular environment. a) receiving a plurality of electrical signals from said plurality of transducers of the transducer array, said array being placed within said environment; b) estimating ( 205, 206, 207, 208, 211, 209, 210) from the plurality of electrical signals received in step a) an acoustic detection threshold value of a spatially limited source sound emission parameter detectable by the detector device in said environment; c) converting the acoustic detection threshold value estimated in step b) into a non-acoustic quantity representative of a magnitude of the physical phenomenon that the detector device is capable to detect in said environment; d) displaying the non-acoustic quantity estimated in step c) as the sensitivity of the detector device for said physical parameter in that particular environment.