Ethyl mercaptan

 NO.72L
C2H5SH
Performance
Measuring Range
0.2 to 0.5 ppm 0.5 to 30 ppm 30 to 75 ppm
Number of Pump Strokes
2 1 1/2
Correction Factor
0.4 1 2.5
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 0.15 ppm (n=2)
Colour Change Yellow → Red
Reaction Principle

C2H5SH + HgCl2 →ClH5S HgCl + HCl
HCl + Base→ Chloride
Coefficient of Variation 10% (for 0.5 to 5 ppm), 5% (for 5 to 30 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
Hydrogen sulphide   + Red
Mercaptans   + Red
Acetylene   + No
Carbon monoxide   + No
Ethylene   + No
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
10 ppm - 2.8 to 18.2%


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