Gastec 121 Quick-measuring Detector tubes Benzene C6H6 (2.5 ~ 120 ppm)
ManufacturerGastec(View more products from this manufacturer)
Model121
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Indicator: 5 to 60 ppm
Measuring Range:
+ 2.5 to 5 ppm, Number of Pump Strokes 4
+ 5 to 60 ppm, Number of Pump Strokes 2
+ 60 to 120 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Dark Green
Reaction Principle: C6H6 + I2O5→ H2S2O7 + I2
Coefficient of Variation: 10% (for 5 to 20 ppm), 5% (for 20 to 60 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 | 0.5 ppm (n=4) | |||
| Colour Change | White → Dark Green | |||
| Reaction Principle | C6H6 + I2O5→ H2S2O7 + I2 | |||
| Coefficient of Variation | 10% (for 5 to 20 ppm), 5% (for 20 to 60 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 |  1% |
No | No |
| Esters |  2000 ppm |
+ | No |
| Aliphatic hydrocarbons | No | Pale brown | |
| Aromatic hydrocarbons | + | Dark green |
Other substance measurable with this detector tube
| Substance | Correction Factor | No. of pump strokes | Measuring Range |
| Diisobutylene | Factor: 9 | 1 | 45 to 540 ppm |
| α-Pinene | Factor 19 | 3 | 95 to 1140 ppm |
| Calibration gas generation | Diffusion 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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