Application Range
Standard Measuring Range: 50 to 500 ppm
Number of Strokes n: 1
Time for Measurement: approx. 20 sec.
Standard Deviation: ±10 to 15%
Color Change: grey green -› orange brown
Ambient Operating Conditions
Temperature: 10 to 40°C
Absolute Humidity: < 40 mg H2O / L
Reaction Principle
Cl2 + o-tolidine -> orange brown reaction product
Cross Sensitivity
Bromine is indicated with the same sensitivity, but with a higher standard deviation ± 25 to 30 %. Chlorine dioxide and nitrogen dioxide are indicated as well, but with different sensitivities.