Arrangement related to a gas sensor

A gas-sensor related arrangement with a first light-generating element, a second light-receiving element and a third element for forming and defining an optical measuring distance or path between said first and second elements through a gas sample, as well as a control unit, with associated memory circuits and calculating circuits, wherein said first, second, and third elements can be coordinated to a unit, said unit being allotted a first plurality of electric connector devices or elements, said connector devices being adapted and distributed along a first surface portion of said unit for an electric connecting possibility to other electric connector devices or elements related to a carrier, such as a printed circuit card, of said unit, wherein said first and said second elements are formed as circuit arrangements of said unit and are disposed on opposite sides of said third element, wherein said first and second elements are closely related to each other within a discrete unit and are there shaped as a first and a second surface section, that said discrete unit in addition is formed and dimensioned with a small thermal mass, that the entire or at least part of the memory circuit, the entire or at least part of the control unit, and/or all or at least part of the associated calculating circuits are coordinated in said discrete unit and that over an internal wiring coordinated with the discrete unit these are connected to chosen first electric connecting devices or elements.