Methanol

 NO.111
CH3OH
Performance
Measuring Range
0.002 to
0.004%		 0.004 to
0.02%		 0.02 to
1.5%		 1.5 to
4.5%
Number of Pump Strokes
4 2 1 1/2
Correction Factor
1/9 1/5 1 3
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 0.0004% (n=4)
Colour Change Pink → Pale blue
Reaction Principle CH3OH + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation 15% (for 0.02 to 0.5 %), 10% (for 0.5 to 1.5 %)
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
Alcohols   + Pale blue
Carbon dioxide   No No
Carbon monoxide   No No
sulphur dioxide   No No
Calibration gas generation Static gas dilution method
TLV-TWA TLV-STEL Explosive range
200 ppm 250 ppm 6 to 36%


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