Ndir / mox - sensor arrangement with itself test functionality

摘要

Gas - sensor arrangement with at least one ndir - sensor (14, 16) for measuring of gas components in a gas, the at least one infrared light source (14) and at least one for a specific wavelength range sensitive infrared sensor (16) as well as a control device (18) which controls the infrared light source (14) and the signal of the infrared sensor is detected and in which the measurement values of both sensors (16, 22) are comparable, whereby the gas - sensor arrangement (10) further comprises at least one metal oxide - a gas sensor - array (mox - array) (22), characterised in that the metal oxide - a gas sensor - array (22) a in the gas occurring comparison - gas component can be detected, which also from the ndir - sensor (16) is able to be recorded, in which the checking device (18) comprises a self-test unit (24), and the deviation between the measured values of both sensors (16, 22) in the case of the detection of a comparison - gas component is an indicator of a malfunction of the gas - sensor arrangement (10), of the self-test unit (24) a fault can be detected when the deviation between the measured values of the comparison - gas component of the two sensors (16, 22) exceeds a threshold value.