Measuring Range 1 to 10 ppm
Number of Pump Strokes 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 Principle C4H8S + MnO4 (Pink) → Pale Yellow 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 (NOTE)
Substance Concentration Interference Change colour by itself to
Ethyl mercaptan 1 ppm No Pale pink (whole layer)
Ethylene 1000 ppm No Pale pink (whole layer)
Propylene 500 ppm No Pale pink (whole layer)
Methanol 300 ppm No Pale pink (whole layer)
Hydrogen sulphide 30 ppm No Pale pink (whole layer)
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
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