Measuring Range	1 to 2 ppm	2 to 50 ppm	50 to 100 ppm
Number of Pump Strokes	2	1	1/2
Correction Factor	1/2	1	2
Sampling Time	1 minute per pump stroke
Detecting Limit	0.2 ppm (n=2)
Color Change	Pink → Yellow
Reaction Principle	CH3CO2H + Base → Reaction product
Coefficient of Variation	10% (for 2 to 10 ppm), 5% (for 10 to 50 ppm)
Shelf Life	3 Years
Corrections for temperature & humidity	Humidity 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
Hydrogen chloride, Hydrogen cyanide,Nitric acid	3 times or higher	+	Yellow
Chlorine, sulphur dioxide, Nitrogen dioxide	1/2 times or higher	+	Yellow

Other substance measurable with this detector tube

Substance	Correction	No. of pump strokes	Measuring range
Acetic anhydride	Factor: 0.3	1	0.6 to 15 ppm
Acrylic acid	Factor: 1.0	1	2 to 50 ppm
Formic acid	Factor: 2.6	1	5.2 to 130 ppm
Isovalenic acid	Factor: 1.0	1	2 to 50 ppm
Maleic anhydride	Factor: 0.4	1	0.8 to 20 ppm
Methacrylic acid	Factor: 0.9	1	1.8 to 45 ppm
Propionic acid	Factor: 1.5	1	3to 75 ppm

Calibration gas generation

Diffusion tube method