| CH2:CHCH:CH2 |
 |
Performance
| Measuring Range |
50 to 800 ppm |
| Number of Pump Strokes |
1 |
| Correction Factor |
1 |
| Sampling Time |
3 minutes per pump stroke |
| Detecting Limit |
10 ppm (n=1) |
| Colour Change |
Pale yellow → White |
| Reaction Principle |
CH2:CHCH:CH2 + (NH4)2MoO4 + Pd2SO4 → White product
|
| Coefficient of Variation |
10% (for 50 to 200 ppm), 5% (for 200 to 800 ppm) |
| 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 |
| Acetylene, Carbon monoxide |
10 ppm |
+ |
Blue |
| Ammonia, Hydrogen cyanide |
|
+ |
White |
| Hydrogen |
20% |
+ |
Blue (whole layer) |
| Hydrogen sulphide |
10 ppm |
+ |
Black |
| Ethylene |
1 ppm |
+ |
Blue |
| Styrene |
|
+ |
Pale blue |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| 1,3-Pentadiene |
5.0 |
1 |
250 to 4000 ppm |
| Calibration gas generation |
Static gas dilution method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 2 ppm |
- |
2.0 to 12% |
