Patent ID: 7356420

Claim:
An analyzing system for the detection of reducing and oxidizing gases in a carbon dioxide gas flow whose quality is to be evaluated, said carbon dioxide gas having an oxygen content not exceeding 30 ppm of oxygen, which comprises: a plurality of detecting means, wherein said detecting means are chemiresistor gas sensors each of them comprising a semiconductor-type metal-oxide active layer, metallic electrodes to monitor the changes in the electrical conductivity of the semiconductor layer and heating means, a sealed measuring chamber into which said plurality of gas sensors are located, means for connecting said carbon dioxide gas flow to said measuring chamber so that a carbon dioxide gas flow is supplied through said chamber, the measurements being performed inside said chamber while said sensors are exposed to said carbon dioxide gas flow, wherein the sensing mechanism of the system involves the monitoring of conductivity changes of each sensor which take place in response to the presence of said pollutant gases contained in the carbon dioxide gas flow, and take place without the need to introduce additional oxygen into the sensor's structures during measurement, wherein the system further comprises calibrating means including pure carbon dioxide gas and contaminated carbon dioxide gas, and means for processing and control of acquisition and data recognition including a system of real-time recognition of said pollutant gases, which provides a diagram with delimited decision zones for pure carbon dioxide gas and contaminated carbon dioxide gas, in which the measurements taken on the carbon dioxide gas are situated and identified.