Patent ID: 6635875
Filing Date: 2003-10-21
Classification: G01M,G01N

Abstract:
Infrared gas analyser (1), especially for use as a gas detector for leak detection using a sampling probe, with said gas analyser comprising a vessel (test vessel 2) through which a test gas flows, and an infrared light source (4, 5, 42) which produces an infrared light that shines through the test vessel (2) and a detector (35) that facilitates the measurement of the infrared light absorption in the test gas wherein a reference vessel (3) is provided in addition to the test vessel (2) through which the test gas flows, whereby a reference gas is sucked from the environment of the test gas suction area and flows through said reference vessel and where the same or an additional light source (4, 5, 42) and the same detector (35) are allocated to said reference vessel, where the analyser is provided with means (38, 41) that effect a modulation of the infrared light shining through the vessels (2, 3) and where means (36) are provided which produce the measured values and which allow that the background signals obtained by the infrared absorption in the gas of the reference vessel (3) are taken into consideration for the signals obtained by measuring the infrared absorption in the test vessel.