| CH3iCH2j4CH3 |
 |
Performance
| Measuring Range |
| 10 to 50 ppm |
50 to 1200 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
1 ppm (n=5) |
| Colour Change |
Orange → Dark green |
| Reaction Principle |
CH3(CH2)4CH3 + K2Cr2O7 + H2SO4 → Cr3+ |
| Coefficient of Variation |
10% (for 50 to 400 ppm), 5% (for 400 to 1200 ppm) |
| Shelf Life |
3 Years |
| Corrections for temperature & humidity |
Unnecessary |
| Store the tubes at cool and dark place. |
Possible coexisting substances and their interferences
(NOTE)
| Substance |
Concentration |
Interference |
Change colour by itself to |
| Acetylene, |
|
+ |
Dark brown |
| Aromatic HCs |
|
+ |
Dark green |
| Alcohols, Esters, Ethers |
|
+ |
Dark green |
| Hydrogen sulphide |
|
+ |
Dark brown |
Organic solvents ( C3) |
|
+ |
Dark green |
| sulphur dioxide |
|
+ |
Dark green |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Acrylonitrile |
Factor: 12 |
1 |
0.06 to 1.14% |
| Tert-Butyl alcohol |
Factor: 10 |
2 |
0.05 to 1.2% |
| Chlorocyclohexane |
Factor: 1 |
2 |
50 to 1200 ppm |
| Cyclohexane |
Factor: 1.2 |
1 |
60 to 1440 ppm |
| Tube 102L Reading (n=2) |
50 |
100 |
200 |
400 |
600 |
800 |
1000 |
1200 |
| Diisobutyl Ketone Conc. (%) |
0.2 |
0.3 |
0.5 |
0.7 |
0.8 |
0.9 |
1.0 |
1.05 |
| Calibration gas generation |
High pressure gas cylinder method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 50 ppm |
- |
1.1 to 7.5% |
