| Methyl mercaptan | CH3SH | NO.71 |
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| Performance |
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Measuring Range |
0.25 to 2.5 ppm |
2.5 to 70 ppm |
70 to 140 ppm |
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Number of Pump Strokes |
2 to 10 |
1 |
1/2 |
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Correction Factor |
1/2 to 1/10 |
1 |
2 |
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Sampling Time |
2 minutes per pump stroke |
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Detecting Limit |
0.1 ppm (n=10) |
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Color Change |
White |
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Reaction Principle |
2CH3SH +PdSO4  (CH3S)2 Pd+ H2SO4 |
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| Coefficient of Variation |
10% (for 2.5 to 20 ppm), 5% (for 20 to 70 ppm) |
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| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity |
Temperature correction is necessary | |||
| Store the tubes at cool and dark place. | ||||
| Possible coexisting substances and their interferences | (NOTE) |
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Substance |
Concentration |
Interference |
Change color by itself |
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Acetylene, Ethylene |
2000 ppm |
Plus error |
Discolor pale brown |
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Carbon Monoxide |
2000 ppm |
Plus error |
Discolor pale brown |
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Other Mercaptans |
- |
Plus error |
Discolor yellow stain |
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Hydrogen Sulfide |
500 ppm |
No effect |
No stain |
| Calibration gas generation | Permeation tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.5ppm | - | 3.9 to 21.8% |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
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