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Carbon dioxide No.2D CO2 Performance Measuring Range 0.02 to 12% Sampling Hours 0.5 to 10 hours Detecting Limit 0.02 ppm (12 hours) Color Change Pale Red → Yellow Reaction Principle CO2 + 2KOH → K2CO3 + H2O Coefficient of Variation 10% (for 0.2 to 8 %-hr) Shelf Life 2 Year Corrections for temperature & humidity Temperature correction is necessary Store the tubes at cool and dark place. Possible coexisting substances and their interferences (NOTE) Substance Concentration Interference Change color by itself to Ammonia 500 ppm No No discoloration up to 500ppm Hydrogen chloride 300 ppm No No discoloration up to 300ppm Chlorine 10 ppm No No discoloration up to 5ppm Hydrogen cyanide 50 ppm No No discoloration up to 30ppm Sulfur dioxide 15 ppm No No discoloration up to 15ppm Nitrogen dioxide 10 ppm No No discoloration up to 10 ppm Hydrogen sulfide 50 ppm No No discoloration up to 30 ppm Calibration gas generation Diffusion tube method TLV-TWA TLV-STEL Explosive range 5000 ppm 30000 ppm -
