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, e.g.: Determining and measuring concentration peaks, Measuring personal exposure in the inhalation area, Detecting leaks in pipelines, gas installations etc., and Air analysis in sewers, shafts and confined spaces.
Contains 10 tubes
|Standard Measuring Range||0.1 to 0.5 mg/m3|
Discoloration compared to color standard
|Number of Strokes (n)||40|
|Time for Measurement||approx. 8 min.|
|Standard Deviation||±50 %|
|Colour Change||violet ─> violet|
|Temperature||5 to 40° C|
|Absolute Humidity||< 20 mg H2O / L|
|Reaction Principle||a) CrO3 + H2SO4 ──> Cr^VI|
b) Cr^VI + diphenylcarbazide ──>
Cr^III + diphenylcarbazone
|Cross Sensitivity||Metal chromates such as zine or |
strontium chromate are indicated
with about half the sensitivity. Cr^III
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.
|Additional Information||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.