Explanation of specification items
(Example)
|
 NO.174D |
 CH2:CHCH:CH2 |
 |
 |
Performance
 Measuring Range |
1.3 to 200 ppm |
 Sampling Hours |
1 to 8 hours |
 Detecting Limit |
1.3 ppm (8 hours) |
 Colour Change |
Reddish purple → Pale brown |
 Reaction Principle |
Butadiene reacts with permanganate to produce light brown reaction product. |
 Coefficient of Variation |
10% (for 10 to 200 ppm¥hr) |
 Shelf Life |
2 Years |
 Corrections for temperature & humidity |
Temperature correction is necessary |
 Store the tubes at cool and dark place. |
|
Possible coexisting substances and their interferences (NOTE)
| Substance | Interference | Change colour by itself to |
| Unsaturated hydrocarbons | + | Pale brown |
Other substance measurable with this detector tube
| Substance | Correction Factor | Measuring Range |
| Ethylene | Factor: 1.2 | 1.5 to 240 ppm |
| Vinyl chloride | Factor: 1.2 | 1.5 to 240 ppm |
| Isoprene | Factor: 2.0 | 2.5 to 400 ppm |
| Trans-1,2-Dichloroethylene | Factor: 3.0 | 3.8 to 600 ppm |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 2 ppm | - | 2.0 to 12% |
