Application Range
Standard Measuring Range: 0.2 to 2 ppm / 2 to 8 ppm
Reverse activation (n) 1 (1A) / 1 (1A)
Number of Strokes n: 5 / 2
Time for Measurement: approx. 8 min / approx. 4 min
Standard Deviation: ± 15 to 20 %
Color Change: light color -> green
Ambient Operating Conditions
Temperature: 2 to 40 °C
Absolute Humidity: < 20 mg H2O / L
Reaction Principle
CH3 Br + H2S2O7 + chromate -> Br2
Br2 + o-tolidine -> green reaction product
Cross Sensitivity
Vinyl chloride or carbon tetrachloride: < 2 ppm no indication. Methyl bromide cannot be measured in the presence of perchloroethylene or trichloroethylene. Sulfuryl fluoride, phosphine, ethylene oxide, ammonia, hydrocyanic acid, chloropicrin and formaldehyde below their AGW/TLV values are not indicated. Ethylene dibromide is indicated with 1.2 times its sensitivity.
Additional Informations
One reverse activationstroke with air or gas sample
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