CH2:CHCH:CH2 |
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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% |