Application Range
Standard Measuring Range: 0.2 to 3 ppm / 3 to 20 ppm
Number of Strokes n: 10 / 2
Time for Measurement: approx. 2 min / 0.4 min
Standard Deviation: ± 10 to 15%
Color Change: blue -› yellow
Ambient Operating Conditions
Temperature: 5 to 40 °C
Absolute Humidity: ≤15 mg H2O / L
Reaction Principle
HCl + bromophenol blue -> yellow reaction product
Cross Sensitivity
No interference on the reading of 10 ppm H2S and 2 ppm SO2. Other acid gases are also indicated, however, with differing sensitivity. Chlorine changes the indicating layer to grey. If chlorine occurs simultaneously, HCl readings will be higher.