| |
|
|
|
Carbon monoxide |
|
NO.1LM |
|
CO |
 |
|
Performance |
|
|
Measuring Range |
|
25 to 50 ppm |
50 to 1000
ppm |
1000 to 2000
ppm |
|
|
Number of Pump
Strokes |
|
|
Correction Factor |
|
|
Sampling Time |
45 seconds per pump
stroke |
|
Detecting Limit |
5
ppm (n=2) |
|
Colour Change |
White → Pale brown /
Pale green (dual
layers) |
|
Reaction Principle |
5CO + I2O5
+ H2S2O7
→ I2 |
|
Coefficient of
Variation |
10% (for 50 to 200
ppm), 5% (for 200 to
1000 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 |
|
Acetylene, Olephines,
Propane, Hexane |
|
+ |
Pale brown |
|
Butane |
|
+ |
Pale brown |
|
Hydrogen |
|
No |
No |
|
|
Calibration gas generation |
High pressure gas cylinder
method |
|
TLV-TWA |
TLV-STEL |
Explosive range |
|
25 ppm |
- |
12.5 to 74% |
|
|
|
|
|
|
Gastec Tubes and
Sampling Pump
