Dräger Tubes For Short Term Measurements: Cyanide 2/a
Dräger Safety offer a massive range of short-term gas detection tubes for the measurement of various gases. This particular set of tubes is for (Cyanide 2/a).
The tubes come in a pack of 10 tubes and have a shelf life of 2 years.
|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 %|
|Colour Change:||yellow to red|
Ambient Operating Conditions:
|Temperature:||0 to 30 °C|
|Absolute Humidity||< 20 mg H2O / L|
a) 2 KCN + H2SO4 ~> 2 HCN + K2SO4 b) 2 HCN + HgCl2 ~> 2 HCI + Hg(CN)2 c) HCI + methyl red ~> red reaction product
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..
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