| Methanol | CH3OH | NO.111LL | |
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| Performance |
|
Measuring Range |
2 to 20ppm |
20 to 56ppm |
|
Number of Pump Strokes |
4 |
2 |
|
Correction Factor |
1 |
2.8 |
|
Sampling Time |
2 minutes per pump stroke |
|
|
Detecting Limit |
0.2 ppm (n=4) |
|
|
Color Change |
Pale yellow |
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|
Reaction Principle |
Methyl alcohol is reduced by cromic acid to produce pale bluish green color. |
|
| Coefficient of Variation |
15% (for 2 to 5 ppm), 10% (for 5 to 20 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 |
|
Substance |
Concentration |
Interference |
Change color by itself |
|
Alcohols |
- |
Plus error |
Produce similar stain by themselves |
| Aromatic hydrocarbons | - | Plus error | Produce similar stain by themselves |
| Calibration gas generation | Diffusion tube method | |
| TLV-TWA | TLV-STEL | Explosive range |
| 200ppm | 250ppm | 6 to 36% |
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| Copyright(c) 2001 GASTEC CORPORATION. All rights reserved. |
Pale bluish green
Cr3+