| C3EC4 ’Y‰»…‘f |
 |
Performance
| Measuring Range |
0.02 to 0.8% |
| Number of Pump Strokes |
1 |
| Correction Factor |
1 |
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
0.002% (n=1) |
| Colour Change |
Orange → Blackish Green |
| Reaction Principle |
LPG+ Cr6++ H2SO4 → Cr3+ |
| Coefficient of Variation |
10% (for 0.02 to 0.2 %), 5% (for 0.2 to 0.8 %) |
| 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 |
| Ketones |
0.2% |
+ |
Blackish green |
| Esters |
0.2% |
+ |
Blackish green |
Hydro carbons( 3) |
|
+ |
Blackish green |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Propylene |
1 |
1 |
0.02 to 0.8 % |
| Xylene |
by scale |
2 |
0.1 to 1.2 % |
| Calibration gas generation |
Static gas dilution method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 1000ppm |
- |
1.6to10% |
