Dragerwerk Aktiengesellschaft

Dräger Safety Ag&co. Kgaa

Dr&auml;gerwerk Aktiengesellschaft

Ingo Pooch

Andreas Mohrmann

Wolfgang Bather

Ralf Drews

Matthias Martens

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

Gas-measuring system

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

Device for measuring the concentration of gaseous and vaporous components of a gas mixture

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.100% *.DELTA.t), which is proportional to the portion of the gaseous or vaporous component.

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Ratekau, Germany

Ingo Pooch