Gastec 122 Quick-measuring Detector tubes Toluene C6H5CH3 (5-690 ppm)
ManufacturerGastec(View more products from this manufacturer)
Model122
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Indicator: 20 to 300 ppm
Measuring Range:
+ 5 to10 ppm, Number of Pump Strokes 2
+ 10 to 300 ppm, Number of Pump Strokes 1
+ 300 to 690 ppm, Number of Pump Strokes 1/2
Sampling Time: per pump stroke
Colour Change: White → Brown
Reaction Principle: C6H5CH3 + I2O5 + H2SO4 → I2
Coefficient of Variation: 10% (for 10 to 100 ppm), 5% (for 100 to 300 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 |
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| Detecting Limit | 1 ppm (n=2) | |||
| Colour Change | White → Brown | |||
| Reaction Principle | C6H5CH3 + I2O5 + H2SO4 → I2 | |||
| Coefficient of Variation | 10% (for 10 to 100 ppm), 5% (for 100 to 300 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 |
| Carbon Monoxide |  1000 ppm |
No(Two layers) | Pale brown |
| Acetylene | 2000 ppm |
No(Two layers) | Pale brown |
| Xylene | 1/5 time |
+ | Brown |
| Hexane | 2000 ppm |
No(Two layers) | Pale brown |
| Benzene | 1/5 time |
+ | Pale yellow |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Ethyl benzene | 1.1 | 1 | 11 to 330 ppm |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 20 ppm(2014) | - | 1.4 to 6.7% |
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