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Formaldehyd No.91D HCHO Performance Measuring Range 0.1 to 20 ppm Sampling Hours 1 to 10 hours Detecting Limit 0.05 ppm (10 hours) Color Change Yellow → Reddish Brown Reaction Principle 3HCHO + (NH2OH)3 H3PO4 → H3PO4 H3PO4 + Base+Phosphate Coefficient of Variation 10% (for 1 to 20 ppm-hr) Shelf Life 1 Year Corrections for temperature & humidity Unnecessary Store the tubes in the refrigerator to keep at 10oC (50oF) or below. Possible coexisting substances and their interferences (NOTE) Substance Interference Change colour by itself to Aldehydes, Ketones, Acid gases + Reddish brown Other substance measurable with this detector tube Substance Correction Factor Sampling Time Measuring Range Acetaldehyde 1.0 1 to 10 hours 0.1 to 20 ppm Furfural 3.0 1 to 10 hours 0.3 to 60 ppm Methyl ethyl ketone 1.25 1 to 10 hours 0.125 to 25 ppm Calibration gas generation Diffusion tube method TLV-TWA TLV-STEL Explosive range - C 0.3 ppm 7.0 to 73%
