Cyanide Detection Tubes 2/a (2 - 15 mg/m3)
For short-term measurements more than 160 Draeger-Tubes are available to measure the so-called spot concentrations of specific gases.
A wide range of different gases and vapours can be detected and measured, such as:
- Determining and measuring concentration peaks
- Measuring personal exposure in the inhalation area
- Detecting leaks in pipelines, gas installations etc.
- Air analysis in sewers, shafts and confined spaces
|Standard Measuring Range:
||2 to 15 mg/m3
|Number of Strokes (n):
|Time for Measurement:
||approx. 2.5 min
||±20 to 30 %
||yellow ─> red
||0 to 30° C
||< 20 mg H2O / L
||a) 2 KCN + H2SO4 ──> 2 HCN + K2SO4
b) 2 HCN + HgCl2 ──> 2 HCl + Hg(CN)2
c) HCl + 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.
||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.