Item #: 8101341
MFG: Draeger

Tetrahydrothiophene Detection Tubes 1/b (1 - 10 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 Range1 to 10 ppm
Number of strokes n:30
Time for Measurementapprox. 15 min.
approx. 10 min. for a measurement
in natural gas
Standard Deviation± 15 to 20 %
Color Changeviolet ──> yellow brown
Temperature0 to 35 °C
Absolute Humidity< 30 mg H2O / L
Reaction Principlea) Adsorption with H2S
b) THT + KMnO4  ──> yellow brown
                                 reaction product
Cross SensitivityUp to 10 ppm hydrogen sulfide is
adsorbed in the pre-tue, causing a
brown discoloration. It is impossible
to measure tetrahydrothiophene in the
presence of mercaptans. Up to 100 ppm
of olefins (e.g. ethene, propene) will
cause the color of the indicating layer to
become lighter, at higher concentrations
the olefins are also indicated. Up to 
200 ppm methanol does not interfere.