| (C2H5)2O |
 |
Performance
| Measuring Range |
0.04 to 1.0% |
| Number of Pump Strokes |
1 |
| Correction Factor |
1 |
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
0.001% (n=1) |
| Colour Change |
Yellowish brown → Dark green |
| Reaction Principle |
(C2H5)2O+ Cr6+ + H2SO4 → Cr3+ |
| Coefficient of Variation |
10% (for 0.04 to 0.2 %), 5% (for 0.2 to 1.0 %) |
| Shelf Life |
3 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 |
Concentration |
Interference |
Change colour by itself to |
| Propane |
0.2% |
+ |
Dark green (whole layer) |
| Alcohols, Esters, Ketones |
|
+ |
Dark green |
| Aromatic HCs. |
500 ppm |
+ |
Dark green |
| Hydrogen sulphide |
500 ppm |
+ |
Green |
| sulphur dioxide |
500 ppm |
+ |
Green |
| Acetylene |
0.3% |
+ |
Dark green (whole layer) |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Isopropyl ether |
0.45 |
2 |
0.018 to 0.45% |
| Methyl ether |
0.85 |
1 |
0.03 to 0.85% |
| Tetrahydrofuran |
1.4 |
1 |
0.056 to 1.4% |
| Toluene |
by scale |
1 |
0.02 to 0.8% |
| Calibration gas generation |
Static gas dilution method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 400 ppm |
500 ppm |
1.9 to 48% |
