Chromic Acid Detection Tubes 0.1/a (0.1 - 0.5 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:
||0.1 to 0.5 mg/m3
Discoloration compared to color standard
|Number of Strokes (n):
|Time for Measurement:
||approx. 8 min
||white ─> violet
||5 to 40° C
||< 20 mg H2O / L
||a) CrO3 + H2SO4 ──> CrVI
b) CrVI + diphenylcarbazide ──> CrIII + diphenylcarbazone
||Metal chromates such as zine or strontium chromate are indicated with about half the sensitivity.
CrIII compounds do not affect the indication.
Very high chromate concentrations lead to a rapid bleaching of the indication. Measurements should be repeated with less strokes.
||After carrying out the required 40 pump strokes the reagent ampoule must be broken, the liquid transferred onto the indicating layer and carefully drawn through it using the pump.