| CH2¡§CH2 |
 |
Performance
| Measuring Range |
(25) to 800 ppm |
| Number of Pump Strokes |
1 |
| Correction Factor |
1 |
| Sampling Time |
3 minutes per pump stroke |
| Detecting Limit |
5 ppm (n=1) |
| Colour Change |
Pale yellow → Blue |
| Reaction Principle |
CH2:CH2 + (NH4)2MoO4 + PbSO4O → Molybdenum blue |
| Coefficient of Variation |
10% (for 25 to 200 ppm), 5% (for 200 to 800 ppm) |
| 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 |
| Ammonia, Hydrogen cyanide |
|
+ |
White |
| Carbon monoxide, Hydrogen |
|
+ |
Blue (whole layer) |
| Hydrogen chloride |
|
+ |
Pink |
| Hydrogen sulphide |
|
+ |
Black |
| Butadiene |
|
+ |
White |
| Butane, Pentane |
|
+ |
Blue (whole layer) |
| Butylene, Propylene |
1/4 |
+ |
Blue |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Acetylene |
1.3 |
1 |
32.5 to 1040 ppm |
| Calibration gas generation |
High pressure gas cylinder method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 200ppm |
- |
2.7 to 36% |
