Abstract: A sensor comprises a sensing element to generate output signals corresponding to receiving signals received from an object and an evaluation unit coupled to the sensing element and weighting the output signals from the sensing element with at least one switching threshold to generate object detection signals. The evaluation unit includes a key adapted to selectively reset the at least one switching threshold to higher and lower values through differences in activation of the key.

Abstract: A sensor comprises a sensing element to generate output signals corresponding to receiving signals received from an object and an evaluation unit coupled to the sensing element and weighting the output signals from the sensing element with at least one switching threshold to generate object detection signals. The evaluation unit includes a key adapted to selectively reset the at least one switching threshold to higher and lower values through differences in activation of the key.

Abstract: In connection with a method and a device for processing measured values, where resistance variations are evaluated as a measure for the variation of the gas concentration to be measured, it is proposed to measure a basic resistance value at least once, preferably repeatedly, by admitting a standard calibration gas, and to store this resistance value and derive therefrom, for each subsequent measurement of the gas component the concentration of which is to be measured, by an arithmetic operation, the ratio between the resulting total resistance value and the momentary basic resistance value, and to evaluate the ratio so obtained for further processing.