Gastec 124 Quick-measuring Detector tubes Styrene C6H5CHCH2 (10-1500 ppm)
ManufacturerGastec(View more products from this manufacturer)
Model124
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Indicator: 20 to 500 ppm
Measuring Range:
+ 10 to 20 ppm, Number of Pump Strokes 2
+ 20 to 500 ppm, Number of Pump Strokes 1
+ 500 to 1500 ppm, Number of Pump Strokes 1/2
Sampling Time: 30 seconds per pump stroke
Colour Change: White → Yellow
Reaction Principle: C6H5CH:CH2+ H2S2O7 → Condensation Polymer
Coefficient of Variation: 15% (for 20 to 100 ppm), 10% (for 100 to 500 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 | 1 ppm (n=2) | |||
| Colour Change | White → Yellow | |||
| Reaction Principle | C6H5CH:CH2+ H2S2O7 → Condensation Polymer | |||
| Coefficient of Variation | 15% (for 20 to 100 ppm), 10% (for 100 to 500 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 | ≧ 0.5% | + (Bleaching) | No |
| Esters | ≧ 0.5% | + (Bleaching) | No |
| Ketones | ≧ 0.5% | + (Bleaching) | No |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 20 ppm | 40 ppm | 1.1 to 6.1% |
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