Toluene Diisocyanate Detection Tubes 0.02/A (0.02 - 0.2 ppm)
For short-term measurements more than 160 Drager 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:
||0.02 to 0.2 ppm
Discoloration compared to color comparison tube.
|Number of strokes n:
|Time for Measurement:
||approx. 20 min
||± 30 %
||white ──> orange
||15 to 30 °C
||< 20 mg H2 O / L
||a) Pyridylpyridinium chloride + NaOH ──> Glutaconaldehyde sodium oletate
b) 2,4-TDI (also for 2,6-TDI) + HCl ──> Aromatic amine
c) Aromatic amine + Glutaconaldehyde ──> orange reaction product
||Other isocyanates are not indicated.
No interference by:
- 5 ppm aniline
- 10 ppm benzylamine
- 5 ppm toluene
- 20 ppm benzene
- Mercaptans also discolor the indicating layer.
||Before carrying out the measurement the lower reagent ampoule must be broken and the liquid transferred to the indication layer, so that it changes color to yellow. Next, the upper reagent ampoule must be broken and the liquid transferred to the indication layer, so that it returns to a white color. After performing 25 pump strokes wait 15 minutes before evaluating the indication.