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简单介绍：
苯气体检测管121SL C6H6 Benzene，Measuring Range 1 to 20 ppm 20 to 100 ppm Number of Pump Strokes 5 1 Correction Factor 1 5 Sampling Time 2 minutes per pump stroke Detecting Limit 0.25 ppm (n=5)苯气体检测管价格
详情介绍：
苯气体检测管121SL C6H6 Benzene
Benzene No.121SL
C6H6
| Performance |
MeasuringRange | 1 to 20 ppm | 20 to 100 ppm |
Number of PumpStrokes | 5 | 1 |
CorrectionFactor | 1 | 5 |
Sampling Time | 2 minutes per pumpstroke | |
Detecting Limit | 0.25 ppm (n=5) | |
Color Change | White → Brownishgray | |
Reaction Principle | C6H6 + I2O5 + H2S2O7 → I2 | |
| Coefficient ofVariation | 20% (for1 to 5 ppm), 15% (for 5 to 20 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 | 50 ppm | No effect | No discoloration |
Toluene | 100 ppm | No effect | No discoloration |
Xylene | 150 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% |