MeasuringRange	0.36 to1.25ppm	1.25 to2.5 ppm	2.5 to 60 ppm	60 to120 ppm
Number of Pump Strokes	5	2	1	1/2
CorrectionFactor	1/7	1/2	1	2
SamplingTime	2 minutes per pumpstroke
DetectingLimit	0.1 ppm (n=5)
ColorChange	Yellow → Red
ReactionPrinciple	2HCN +HgCl2 → Hg(CN)2+ 2HCl HCl + Base → Chloride product
Coefficient ofVariation	10% (for 2.5 to 20ppm), 5% (for 20 to 60 ppm)
ShelfLife	2Years
Correctionsfor temperature & humidity	Humidity correction is necessary
Store the tubes at cool and darkplace.

Possible coexisting substances and theirinterferences

(NOTE)

Substance	Concentration	Interference	Change color by itself
Sulfurdioxide	20 ppm	Plus error	Reddiscoloration
Hydrogensulfide	5 ppm	Plus error	Reddiscoloration

Othersubstance measurable with this detector tube

Substance	Correction Factor	Pump Strokes	Measuring Range
Acetone cyanohydrine	1.15	1	2.88 to 69 ppm
Boron trichloride	by scale	2	0.5 to 20ppm

Calibration gasgeneration

Diffusion tubemethod