Measuring Range 10 to 100 mg/m3
Number of Pump Strokes 2
Correction Factor 1
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 2 mg/m3 (n=2)
Colour Change Pink → Pale Yellow
Reaction Principle C4H8S + MnO4 (Pink) → Pale Yellow Product
Coefficient of Variation 10% (for 10 to 30 mg/m3), 5% (for 30 to 100 mg/m3)
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 2 ppm No Pale pink (whole layer)
Ethylene 2000 ppm No Pale pink (whole layer)
Propylene 1000 ppm No Pale pink (whole layer)
Methanol 1000 ppm No Pale pink (whole layer)
Hydrogen sulphide 80 ppm No Pale pink (whole layer)
1-Butene 1000 ppm No Pale pink (whole layer)
tert-Butyl Mercaptan 10 mg/m3 No Pale pink (whole layer)
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
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