Patent ID: 7132658

Claim:
A detection assembly for a non-dispersive infrared multigas analyzer, comprising: a beam splitter for dividing an IR-radiation beam into at least one reflected beam portion and at least one transmitted beam portion, at least a first and a second detector unit both with at least two separate detectors respectively, and optical filters in front of said detectors; said detector units being positioned to receive said at least one reflected beam portion and said at least one transmitted beam portion respectively, wherein: said first detector unit and said second detector unit both have at least one first detector, said first detectors being measuring detectors each provided with an optical measurement filter, which has a transmission wavelength band in the range of the absorption band of a gas component, so as to affect that portion of the IR-radiation ending into said first detector; and said first detector unit and said second detector unit both have at least one second detector, said second detectors being reference detectors each provided with an optical reference filter, which has a transmission wavelength range, within which said gas component does not have a substantial absorption, so as to affect that portion of the IR-radiation ending into said second detector; and that said first detector in said first detector unit and said second detector in said second detector unit are positioned to constitute a first independent single path analyzer channel, and said second detector in said first detector unit and said first detector in said second detector unit are positioned to constitute a second independent single path analyzer channel.