SKU: GAS76 Categories: ,

GAS76 Tetrahydrothiophene Gastec Detector Tubes 1 – 10ppm

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SKU: GAS76 Categories: ,


GAS76 Tetrachloroethylene Standard Gastec Detector Tubes

Gas detector tubes are glass tubes that are filled with chemical reagent that absorbs and reacts with the target gas or vapour being measured.

A colorimetric stain (a colour change) is created. For most tubes, the concentration is read directly from the pinpoint accurate measurement scale on each tube.

This makes this form of monitoring ideal for spot sampling as it can be more accurate then electronic gas detectors.

The Gastec detector tube system is comprised of a handheld Gastec air sampling pump and Gastec detector tubes.

Measuring Range 1 to 10 ppm
Number of Pump Stroke 4
Correction Factor 1
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 0.25 ppm (n=4)
Colour Change Pink        Pale Yellow
Reaction Formula Tetrahydrothiophene reduces permanganate
to form pale yellowish reaction product.
C4H8S + MnO4 (Pink)        Yellow Reaction Product
Coefficient of Variation 10% (for 1 to 3 ppm), 5% (for 3 to 10 ppm)
Shelf Life 2 Years
Corrections for
temperature & humidity
Temperature correction is necessary
Store the tubes at cool and dark place.


Possible coexisting substances and their interferences
Substance Concentration Interference Change colour by itself
Ethyl Mercaptan 1ppm No Discolour whole layer to pale pink
Ethylene 1000 ppm No Discolour whole layer to pale pink
Propylene 500 ppm No Discolour whole layer to pale pink
Methanol 300 ppm No Discolour whole layer to pale pink
Hydrogen Sulphide 30 ppm No Discolour whole layer to pale pink
Calibration gas generation Diffusion tube method

Additional Information

Weight 0.1 kg
Multi Gas Tags

Gas Range



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