Abstract: For the purpose of gas quality monitoring, a spectroscopic examination of a gas sample from a space (10) to be monitored is carried out, e.g. by Raman spectroscopy. The spectroscopic examination yields a measurement spectrum extending over a wavelength range. A deviation of the measurement spectrum from at least one comparison sample (160) is then detected. Depending on the detected deviation, a gas quality warning (QW) is produced.

Abstract: For the purpose of gas quality monitoring, a spectroscopic examination of a gas sample from a space (10) to be monitored is carried out, e.g. by Raman spectroscopy. The spectroscopic examination yields a measurement spectrum extending over a wavelength range. A deviation of the measurement spectrum from at least one comparison sample (160) is then detected. Depending on the detected deviation, a gas quality warning (QW) is produced.

Abstract: A process for producing a reflection-reducing interference layer system is provided, in which a stack of layers is formed by applying to a surface of a substrate several layers which have alternately a high refractive index and a low refractive index, and a nanoporous final layer is applied to the stack of layers by vapour deposition of the material of the final layer at an oblique angle relative to the normal of the top layer of the stack of layers such that the refractive index of the final layer is lower than the refractive index of the top layer of the stack of layers.

Abstract: A local monitoring of functions, in which a sensor is connected to a voltage source via an electrical conductor, in which the sensor is arranged, together with at least one further electrical or electronic component, on a printed circuit board (9) provided with conductor tracks, the sensor being electrically conductively connected, by means of the conductor tracks of the printed circuit board (9), to the component connected to the conductor tracks, and in which the printed circuit board (9) is arranged in a housing (15). In order to supply a secure and immovable hold, the printed circuit board (9) with conductors (7, 8) connected to the conductor tracks is arranged in a holder (17), which is made from a mechanically stable insulating material, accommodates the printed circuit board (9) and has limiting stops (19, 20, 21) for the printed circuit board (9) and laterally protruding latching elements (22, 23).