| Hydrogen sulfide | H2S | NO.4LT |
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| Performance |
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Measuring Range |
0.1 to 0.2 ppm |
0.2 to 2.0 ppm |
2.0 to 4.0 ppm |
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Number of Pump Strokes |
2 |
1 |
1/2 |
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Correction Factor |
1/2 |
1 |
2 |
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Sampling Time |
1 minute per pump stroke |
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Detecting Limit |
0.05 ppm (n=2) |
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Color Change |
Pale Yellow |
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Reaction Principle |
Hydrogen sulfide reacts with reagent to produce intermediate |
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| Coefficient of Variation |
10% (for 0.2 to 0.5 ppm), 5% (for 0.5 to 2 ppm) |
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| Shelf Life | 2 Years | ||
| Corrections for temperature & humidity |
Temperature correction is necessary | ||
| Store the tubes in the refrigerator to keep at 10oC (50oF) or below. | |||
| Possible coexisting substances and their interferences | (NOTE) |
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Substance |
Concentration |
Interference |
Change color by itself |
|
Ammonia |
- |
No effect |
No discoloration |
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Sulfur dioxide |
- |
No effect |
No discoloration |
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Nitrogen dioxide |
- |
No effect |
No discoloration |
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Mercaptans |
1/10 time |
Plus error |
Produce reddish brown color |
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Methyl sulfide |
- |
No effect |
No discoloration |
| Calibration gas generation | Permeation tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 10ppm | 15ppm | 4.0 to 44% |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
Reddish Brown