Patent ID: 7541587

Claim:
A gas sensor comprising a cavity for containing a gas; means for generating radiation which is transmitted through the cavity and including one or more wavelengths which is absorbed in use by a gas to be detected; and a detector for detecting radiation which has passed through the cavity, the detector having a surface area which is visible to the interior of the cavity, wherein the radiation generating means and/or detector(s) is mounted on a printed circuit board (PCB) and is surrounded by resilient protection comprising a resilient member having one or more apertures through which the radiation means and/or respective detector(s) extend; and the resilient member, the PCB and the components mounted thereon are located in an electronics housing having an upper wall, the upper surface of which defines a wall of the cavity, the resilient member extending from the PCB to the lower surface of the upper wall of the electronics housing such that free volume therewithin is reduced.