Benzene |
NO.121L |
Measuring Range |
|
||
Number of Pump Strokes |
|
||
Correction Factor |
|
||
Sampling Time | 1.5 minutes per pump stroke | ||
Detecting Limit | 0.1 ppm (n=10) | ||
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. |
Substance | Concentration | Interference | Change colour by itself to |
Alcohols | No | No | |
Ethyl benzene | 1 ppm | + | Dark brown |
Xylene | 10 ppm | + | Dark brown at zero point |
Toluene | 1 ppm | + | Dark brown |
Hexane | 3 ppm | + | No |
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 | 2.5 ppm | 1.3 to 7.1% |