Gastec 123L Gastec 123L Quick-measuring Detector tubes Xylene C6H4(CH3)2 (2~200ppm)
Model123L
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Indicator: 2 to100 ppm
Measuring Range:
+ 2 to100 ppm, Number of Pump Strokes 2
+ 100 to 200 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Brown
Reaction Principle: C6H4(CH3)2 + I2O5 + H2SO4 → I2
Coefficient of Variation: 10% (for 2 to 30 ppm), 5% (for 30 to 100 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 1.5 minutes per pump stroke | ||
| Detecting Limit | 1 ppm (n=2) | ||
| Colour Change | White → Brown | ||
| Reaction Principle | C6H4(CH3)2 + I2O5 + H2SO4 → I2 | ||
| Coefficient of Variation | 10% (for 2 to 30 ppm), 5% (for 30 to 100 ppm) | ||
| Shelf Life | 3 Years | ||
| Corrections for temperature & humidity | Unnecessary | ||
| Store the tubes at cool and dark place. | |||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Acetylene , Ethylene , Hexane | No | No | |
| Alcohols , Esters , Ketones | No | No | |
| Aromatic hydrocarbons | + | Brown |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 100 ppm | 150 ppm | 1.0 to 7.0% |
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