Gastec 121L Quick-measuring Detector tubes Benzene C6H6
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Indicator: 0.1 to 10 ppm
Measuring Range:
+ 0.1 to 10 ppm, Number of Pump Strokes 5
+ 10 to 65 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: White → Dark green
Reaction Principle: C6H5 + I2O5→ H2S2O7 + I2
Coefficient of Variation: 10% (for 0.1 to 3 ppm), 5% (for 3 to 10 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 | 2 minutes per pump stroke | ||
| Detecting Limit | 0.05 ppm (n=5) | ||
| Colour Change | White → Dark green | ||
| Reaction Principle | C6H5 + I2O5→ H2S2O7 + I2 | ||
| Coefficient of Variation | 10% (for 0.1 to 3 ppm), 5% (for 3 to 10 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, Ketones | No | No | |
| Ethyl benzene |  1/1 |
+ | Dark brown |
| Xylene | 10 ppm |
+ | Dark brown around zero point |
| Toluene | 1/1 |
+ | Dark brown |
| Hexane | 3 ppm |
+(Unclear demarcation) | No |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Methylene Iodide | 2.2 | 5 | 0.22 to 22 ppm |
| Methyl Iodide | 3.2 | 5 | 0.32 to 32 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.5 ppm(2014) | 2.5 ppm(2014) | 1.3 to 7.1% |
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