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简单介绍：
苯气体检测管121SP C6H6，Measuring Range 0.5 to 10 ppm Number of Pump Strokes 3 Correction Factor 1 Sampling Time 1.5 minutes per pump stroke Detecting Limit 0.2 ppm (n=3) ，苯气体检测管价格
详情介绍：
苯气体检测管121SP C6H6
Benzene No.121SP
C6H6
| Performance |
Measuring Range | 0.5 to 10 ppm |
Number of Pump Strokes | 3 |
Correction Factor | 1 |
SamplingTime | 1.5 minutes per pumpstroke |
DetectingLimit | 0.2 ppm (n=3) |
ColorChange | White → Brown |
ReactionPrinciple | 2C6H6+ HCHO → C6H5CH2C6H5 + H2O |
| Coefficient ofVariation | 10% (for 0.5 to 3ppm), 5% (for 3 to 10 ppm) |
| ShelfLife | 2 Years |
| 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 | 500 ppm | No effect | No discoloration |
Toluene | 100 ppm | No effect | No discoloration |
Xylene | 100 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% |