MeasuringRange	0.05 to 0.1%	0.1 to 1.2%	1.2 to 2.4%
Number of Pump Strokes	2	1	1/2
CorrectionFactor	1/2	1	2
SamplingTime	2 minutes per pumpstroke
DetectingLimit	0.01% (n=2)
ColorChange	Yellowish brown →Greenish brown
ReactionPrinciple	Hydorocarbon(C2 + C7) +Cr6+ + H2S2O7 →Cr3+
Coefficient ofVariation	10% (for0.1 to 1.2 %)
ShelfLife	2Years
Correctionsfor temperature & humidity	Unnecessary
Store the tubes at cool and darkplace.

Possible coexisting substances and theirinterferences

(NOTE)

Substance	Concentration	Interference	Change color by itself
Carbonmonoxide	-	No effect	Nodiscoloration
Methane,Ethane	-	No effect	Nodiscoloration
Otherhydrocarbons	-	Plus error	Produce similarstain

Othersubstance measurable with this detector tube

Substance	Correction Factor	Pump Strokes	Measuring Range
Acetylene	1.5	1/2, 1, 2	0.075 to 3.6%
Butane, Heptane,Isobutane	0.7	1/2, 1, 2	0.035 to 1.68%
Ethylene	7.0	1/2, 1, 2	0.35 to 16.8%
Hexane	0.5	1/2, 1, 2	0.025 to 1.2%
Isopentane	0.9	1/2, 1, 2	0.045 to 2.16%
Pentane	0.75	1/2, 1, 2	0.0375 to 1.8%
Propane	1.0	1/2, 1, 2	0.05 to2.4%

Calibration gasgeneration

Diffusion tubemethod