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简单介绍：
苯气体检测管121S Benzene C6H6，Measuring Range 2 to 5 ppm 5 to 120 ppm 120 to 312 ppm Number of Pump Strokes 4 2 1 Correction Factor 0.4 1 2.6 Sampling Time 2 minutes per pump stroke Detecting Limit苯气体检测管价格
详情介绍：
苯气体检测管121S Benzene C6H6
Benzene No.121S
C6H6
| Performance |
MeasuringRange | 2 to 5 ppm | 5 to 120 ppm | 120 to 312 ppm |
Number of PumpStrokes | 4 | 2 | 1 |
CorrectionFactor | 0.4 | 1 | 2.6 |
Sampling Time | 2 minutes per pumpstroke | ||
Detecting Limit | 0.5 ppm (n=4) | ||
Color Change | White → Darkgreen | ||
Reaction Principle | C6H6 + I2O5 + H2S2O7 → I2 | ||
| Coefficient ofVariation | 20% (for5 to 40 ppm), 15% (for 40 to 120 ppm) | ||
| ShelfLife | 3Years | ||
| Correctionsfor temperature & humidity | Unnecessary | ||
| Store the tubes at cool and darkplace. | |||
| Possible coexisting substances and theirinterferences | (NOTE) |
Substance | Concentration | Interference | Change color by itself |
Hexane | 100 ppm | No effect | No discoloration |
Toluene | 200 ppm | No effect | No discoloration |
Xylene | 300 ppm | No effect | No discoloration |
Aromatichydrocarbons other than benzene are trapped in the brown layer inthe pretreatment tube.If the pretreatment reagent is entirelyconsumed (whole brown layer turns to dark brown),ahigher reading will be given. |
| Calibration gasgeneration | Diffusion tubemethod | |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.5ppm | 2.5ppm | 1.3 to 7.1% |