Patent ID: 8646341

Claim:
A gas analysis device for analyzing a gas sample, the device comprising: a housing with a detector tube receiving bracket; a detector tube mounted in the detector tube receiving bracket, said detector tube absorbing gases in the gas sample; a gas duct connected to the bracket; a filter cartridge connected to the gas duct, said filter cartridge being separate from said detector tube; a pump for sampling gas, the filter cartridge being in operative connection with the detector tube and the pump; filter material through which gas flows between the detector tube and the pump, the filter material being provided in the filter cartridge, the filter material comprising a granular porous material with an impregnation for absorbing particular gases, said impregnation including basic copper carbonate, basic zinc carbonate or a mixture of copper carbonate and zinc carbonate as an impregnating component, said granular porous material consisting essentially of at least one of silica gel, aluminum oxide and aluminum silicate; and a particle filter arranged upstream or downstream of the filter material in the filter cartridge, the particle filter absorbing aerosols or dusts.