Item #: CH27301
MFG: Draeger

Methyl Bromide Detection Tubes 5/b (5 -50 ppm)

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 Range5 to 50 ppm
Number of strokes n:5
Time for Measurementapprox. 45 sec.
Standard Deviation± 20 to 30 %
Color Changegreen ──>  brown
Temperature0 to 40°C
Absolute Humidity3 to 15 mg H2O / L
Reaction Principlea) CH3Br + SO3 + MnO4-  ──> Br2
b) Br2 + o-Dianisidine ──> brown reaction
Cross SensitivitySeveral other halogenated hydrocarbons
and free halogens are indicated, but not
all of them.

The sensitivity to the other halogenated
hydrocarbons varies, in some cases higher
and in others lower. Examples:

5 ppm Hydrogen chloride gives an indication
of 1-2 mm in length. 

50 ppm Hydrogen chloride and hydrogen
bromide give an indication of 20-30 ppm.

1,2-Dibromoethane is indicated with about
the same sensitivity. 

100 ppm 1,1,1-Trichloroethane gives an
indication of 5-10 ppm.
Additional InformationBefore carrying out the measurement the
reagent ampoule must be broken. The 
granular contents must be shaken out of the
broken ampoule by gently tapping the side
of the tube. The tube must be held vertically
with the inlet of the tube up during the