CH3OH |
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Performance
Measuring Range |
20 to 40 ppm |
40 to 1000 ppm |
|
Number of Pump Strokes |
|
Correction Factor |
|
Sampling Time |
4 minutes per pump stroke |
Detecting Limit |
5 ppm (n=2) |
Colour Change |
Pink → Pale blue |
Reaction Principle |
CH3OH + Cr6+ + H2SO4 → Cr3+ |
Coefficient of Variation |
15% (for 40 to 200 ppm), 10% (for 200 to 1000 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 |
Other substance measurable with this detector tube
Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
Ethylene Chlorohydrine |
by scale |
3 |
20 to 200 ppm |
Calibration gas generation |
Diffusion tube method |
TLV-TWA |
TLV-STEL |
Explosive range |
200 ppm |
250 ppm |
6 to 36% |