Application Range
Standard Measuring Range: 50 to 600 ppm
Number of Strokes n: 2 + 3 desorption strokes in clean air
Time for Measurement: approx. 1.5 min
Standard Deviation: ± 10 to 15 %
Color Change: grey -> brown red
Ambient Operating Conditions
Temperature: 15 to 40 °C
Absolute Humidity: 5 to 15 mg H2O / L
Reaction Principle
a) 1,1,1-trichloroethane + IO3–/H2S2O7 -> Cl2
b) Cl2+ o-tolidine -> brown red reaction product
Cross Sensitivity
Other chlorinated hydrocarbons are indicated, but with different sensitivities. In the presence of aromatic hydrocarbons the indication is too low (e.g.
200 ppm 1,1,1-trichloroethane and 200 ppm toluene, the reading amounts to 1/4 only, i.e. 50 ppm).
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