Application Range
Standard Measuring Range: 0.1 to 2.5 ppm / 3 to 15 ppm
Number of Strokes n: 10 / 2
Time for Measurement: approx. 3 min /approx. 40 sec.
Standard Deviation: ± 10 to 15 %
Color Change: yellow -> red
Ambient Operating Conditions
Temperature: 5 to 40°C
Absolute Humidity: 2 to 40 mg H2O / L
Reaction Principle
2 R-SH + Hg Cl2 -> Hg(CH3S)2 + 2 HCl
HCl + pH-indicator -> reddish reaction product
Cross Sensitivity
Propyl mercaptan and n-butyl-mercaptan are indicated, but with different sensitivities. 4 ppm ethylene, 30 ppm CO, 10 ppm tetrahydrothiophene and 100 ppm hydrogen sulfide do not affect the indication. Hydrogen sulfide changes the pre-layer to black.