| Methylene chloride | CH2Cl2 | NO.138L |
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| Performance |
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Measuring Range |
10 to 60 ppm |
60 to 150 ppm |
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Number of Pump Stroke |
2 |
1 |
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Correction Factor |
1 |
2.5 |
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Sampling Time |
3 minutes per pump stroke |
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Detecting Limit |
5 ppm (n=2) |
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Color Change |
White |
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Reaction Principle |
Methylene chloride is oxidized and produce intermediate products in the primary tube. It reacts with detecting agent to produce pale pink stain. |
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| Coefficient of Variation | 15% (for 10 to 20 ppm), 10% (for 20 to 60 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) |
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Substance |
Concentration |
Interference |
Change color by itself |
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Cl2, Br2, I2 |
- |
Plus error |
Discolors pale pink |
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Unsaturated halogenated HCs |
6 ppm |
Plus error |
Discolors pale pink |
|
Saturated halogenated HCs |
3 ppm |
Plus error |
Discolors pale pink |
| Calibration gas generation | Diffusion tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 50ppm | - | 15.5 to 66.9% |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
Pale Pink