| HC≡CH |
 |
Performance
| Measuring Range |
| 0.05 to 0.1% |
0.1 to 2.0% |
2.0 to 4.0% |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
0.02 % (n=2) |
| Colour Change |
White → Brown |
| Reaction Principle |
HC CH + I2O5→ H2S2O7 + I2 |
| Coefficient of Variation |
15% (for 0.1 to 0.5 %), 10% (for 0.5 to 2 %) |
| Shelf Life |
3 Years |
| Corrections for temperature & humidity |
Temperature correction is necessary |
| Store the tubes in the cool and dark place. |
Possible coexisting substances and their interferences
(NOTE)
| Substance |
Concentration |
Interference |
Change colour by itself to |
| Carbon monoxide |
0.1% |
+ |
Brown |
| Ethylene |
0.5% |
+ |
Brown |
| More than C3 HCs |
|
+ |
Brown |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Benzene |
0.3 |
4 |
0.03 to 0.6% |
| Ethylene |
1.0 |
4 |
0.1 to 2% |
| 1,1,1-Trichloroethane
|
0.6 |
1 |
0.06 to 1.2% |
| Calibration gas generation |
High pressure gas cylinder method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| - |
- |
2.5 to 81% |
