A semiconductor sensing device for sensing presence, absence or level of species-of-interest in the environment is disclosed. The lock cylinder is secured to the housing by a screw covered by a rose around the part of the housing, the rose being secured in place by fixing screws which can only be accessed upon removal of the casing assembly from the door and with the bolt in a retracted position. An analog-to-digital converter decomposes the input broadband signal into N frequency bands that are separately sampled before a Fourier transform is applied to convert the signal into the digital domain. The method also comprises linking the display area to the assortment, wherein a first display area version is automatically created corresponding to the first assortment version. A cut is provided in the cylindrical body, and a linear fastening portion of the coil spring is fitted into the cut, thereby forming a pin fastening narrowed portion between the fastening portion and a wall portion of the cylindrical body opposed thereto. The location of a defect within an inspection area having a variable beam width is estimated based on an analysis of the output of the detector.