Abstract: A gas-measuring system is provided that is suitable for both mobile and stationary use. A mobile measuring device (2) with sensors (4, 5, 6, 7) for detecting gas concentrations and a base station (3) are provided for this purpose. The mobile measuring device (2) is inserted into a holder (31) of the base station (3) and the operating functions to the measuring device (2) are now switched over to the base station (3).

Abstract: A gas-measuring system is provided that is suitable for both mobile and stationary use. A mobile measuring device (2) with sensors (4, 5, 6, 7) for detecting gas concentrations and a base station (3) are provided for this purpose. The mobile measuring device (2) is inserted into a holder (31) of the base station (3) and the operating functions to the measuring device (2) are now switched over to the base station (3).

Abstract: A device for detecting gaseous and vaporous components of a gas mixture by means of channels 2, which are located next to each other on a support 201, are connected in parallel in terms of flow, and are exposed to the component to be detected along a flow axis 3. A scanning section 6 of a scanning device is provided which extends along one of the channels 2, for detecting the change in color of reaction zones in the channels 2. Multiple channel arrangements can also be analyzed in a simple manner with a scanning section evaluating individual channels. At least some of the channels 2 on the support 201 are directed such that an angle &agr; not equal to 0 is formed between the flow axis 3 and the scanning section 6, and the channels 2 are located in the covered area of the scanning section 6.

Abstract: The invention is directed to a method for determining the portion of a gaseous or vaporous component in a gas mixture utilizing a detecting substance which can enter into a chemical reaction with the component to produce a coloration of the detecting substance and utilizing a device for evaluating the coloration. The method includes the steps of: passing the gas mixture at a constant volume flow through a channel containing the detecting substance; detecting a reflectance signal I(t) within a defined spatially fixed length segment of the channel; determining a slope .DELTA.I/.DELTA.t at the start of the chemical reaction during a time interval .DELTA.t in which the detecting substance is present in excess; determining a saturation reflectance signal I.sup.100% toward the end of the chemical reaction which corresponds to an almost complete chemical conversion of the detecting substance within the length segment; and, determining a normalized slope in correspondence to the formal relationship: .DELTA.I/(I.sup.