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  Gastec Tubes and Sampling Pump
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Gas sampling pump kit and accessories
 
 
 
Tetrahydrothiophene   NO.76H
C4H8S
Performance
Measuring Range 10 to 200 ppm
Number of Pump Strokes 1
Correction Factor 1
Sampling Time 45 seconds per pump stroke
Detecting Limit 2 ppm (n=1)
Colour Change Pink → Pale Yellow
Reaction Principle C4H8S + MnO4 (Pink) → Pale Yellow Product
Coefficient of Variation 10% (for 10 to 60 ppm), 5% (for 80 to 200 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 (NOTE)
Substance Concentration Interference Change colour by itself to
Ethyl mercaptan ˇĺ 3 ppm No Pale pink (whole layer)
Ethylene ˇĺ 5000 ppm No Pale pink (whole layer)
Propylene ˇĺ 2000 ppm No Pale pink (whole layer)
Methanol ˇĺ 2000 ppm No Pale pink (whole layer)
Hydrogen sulphide ˇĺ 300 ppm No Pale pink (whole layer)
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
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