Application Range
Standard Measuring Range: 0.5 to 5 / 0.2 to 2.5 ppm
Number of Strokes n: 10 / 20
Time for Measurement: approx. 1.5 min / 3 min
Standard: ± 20 to 30 %
Color Change: white -› pink
Ambient Operating Conditions
Temperature: 10 to 40 °C
Absolute Humidity: 3 to 15 mg H2O / L
Reaction Principle
HCHO + C6H4(CH3)2 + H2SO4 -> quinoid reaction products
Cross Sensitivity
Styrene, vinyl acetate, acetaldehyde, acrolein, diesel fuel and furfuryl alcohol are indicated with a yellowish brown discoloration. 500 ppm octane, 5 ppm nitric oxide and 5 ppm nitrogen dioxide have no effect.
Extension of the Measuring Range
The measuring range can be extended in conjunction with the activation tube (Order No. 81 01 141). The following information applies to the n = 20 stroke scale:
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