Gastec 124L Quick-measuring Detector tubes Styrene C6H5CH：CH2 (2-100ppm)
ManufacturerGastec(View more products from this manufacturer)
Model124L
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Indicator: 2 to 25 ppm
Measuring Range:
+ 2 to 25 ppm, Number of Pump Strokes 4
+ 25 to 100 ppm, Number of Pump Strokes 1
Sampling Time: 30 seconds per pump stroke
Colour Change: White → Yellow
Reaction Principle: C6H5CH:CH2+ H2S2O7 → Condensation Polymer
Coefficient of Variation: 10% (for 2 to 5 ppm), 5% (for 5 to 25 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 | 30 seconds per pump stroke | ||
| Detecting Limit | 0.5 ppm (n=4) | ||
| Colour Change | White → Yellow | ||
| Reaction Principle | C6H5CH:CH2+ H2S2O7 → Condensation Polymer | ||
| Coefficient of Variation | 10% (for 2 to 5 ppm), 5% (for 5 to 25 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 |
| Alcohols, Esters |  10 times |
+ (Bleaching) | No |
| Aldehydes, Ketones | 10 times |
+ (Bleaching) | No |
| Butadiene | 5 ppm |
+ (Bleaching) | Dark brown |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Divinyl benzene | 0.6 | 3 | 1 to 15 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 20 ppm(2014) | 40 ppm(2014) | 1.1 to 6.1% |
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