Application Range
Standard Measuring Range: 2 to 15 mg/m3
Number of Strokes n: 10(2+)
Time for Measurement: approx. 2.5 min
Standard Deviation: ±20 to 30%
Color Change: yellow -› red
Ambient Operating Conditions
Temperature: 0 to 30°C
Absolute Humidity: < 20 mg H2O / L
Reaction Principle
a) 2 KCN + H2SO4 -> 2 HCN + K2SO4
b) 2 HCN + HgCl2 -> 2 HCI + Hg(CN)2
c) HCI + methyl red -> red reaction product
Cross Sensitivity
Free hydrogen cyanide is indicated already before breaking the ampoule. Acid gases are indicated with different sensitivities. A certain portion of the cyanide can have reacted with the CO2 in the air through hydrolysis. It is impossible to measure cyanide in the presence of phosphine
Additional Information
After carrying out the 10 strokes the reagent ampoule must be broken, the liquid transferred onto the white separating layer and carefully drawn through with two strokes in cyanide free air using
the pump. The indicating layer must not become moist
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