| C2`C7 |
 |
Performance
| Measuring Range |
| 0.05 to 0.1% |
0.1 to 1.2% |
1.2 to 2.4% |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
0.01% (n=2) |
| Colour Change |
Yellowish brown → Greenish brown |
| Reaction Principle |
Hydorocarbon (C2 + C7) + Cr6+ + H2S2O7 → Cr3+ |
| Coefficient of Variation |
10% (for 0.1 to 1.2 %) |
| Shelf Life |
2 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 |
| Carbon monoxide |
|
No |
No |
| Methane, Ethane |
|
No |
No |
| Organic solvents |
|
+ |
Greenish brown |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Acetylene |
1.5 |
1/2, 1, 2 |
0.075 to 3.6% |
| Butane, Heptane, Isobutane |
0.7 |
1/2, 1, 2 |
0.035 to 1.68% |
| Ethylene |
7.0 |
1/2, 1, 2 |
0.35 to 16.8% |
| Hexane |
0.5 |
1/2, 1, 2 |
0.025 to 1.2% |
| Isopentane |
0.9 |
1/2, 1, 2 |
0.045 to 2.16% |
| Pentane |
0.75 |
1/2, 1, 2 |
0.0375 to 1.8% |
| Propane |
1.0 |
1/2, 1, 2 |
0.05 to 2.4% |
| Calibration gas generation |
High pressure gas cylinder method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| - |
- |
- |
