Measuring Range	0.125 to 0.25 ppm	0.25 to 10 ppm	10 to 25 ppm
Number of Pump Strokes	2	1	1/2
Correction Factor	1/2	1	2.5
Sampling Time	1.5 minutes per pump stroke
Detecting Limit	0.05 ppm (n=2)
Color Change	Pink → Pale Yellow
Reaction Principle	CH3CO2H + Base → Reaction product
Coefficient of Variation	10% (for 0.25 to 3 ppm), 5% (for 3 to 10 ppm)
Shelf Life	2 Years
Corrections for temperature & humidity	Temperature correction is necessary
Store the tubes at in the refrigerator to keep at 10ºC(50ºF) or below.

Possible coexisting substances and their interferences

(NOTE)

Substance	Concentration	Interference	Change color by itself
Ammonia	Higher than 2 times	-	No
Chlorine, sulphur dioxide, Nitrogen dioxide		+	Pale Yellow
Formic Acid, Acetic anhydride		+	Pale Yellow

Other substance measurable with this detector tube

Substance	Correction	No. of pump strokes	Measuring range
Acetic anhydride	Factor: 0.6	1	0.15 to 6 ppm
Acrylic acid	Factor: 1.8	1	0.45 to 18 ppm
Butyric acid	Factor: 1.3	1	0.325 to 13 ppm
Formic acid	Factor: 2.0	1	0.5 to 20 ppm
Isovaleric acid	Factor: 1.5	1	0.38 to 15 ppm
Methacrylic acid	Factor: 1.4	1	0.35 to 14 ppm
Propionic acid	Factor: 1.0	1	0.25 to 10 ppm
Valeric acid	Factor: 1.5	1	0.38 to 15 ppm

Calibration gas generation

Diffusion tube method