Gastec 111LL 快速甲醇检测管 CH3OH(2~56 ppm)

Indicator: 2 to 20 ppm
Measuring Range: 
+ 2 to 20 ppm, Number of Pump Strokes 4
+ 20 to 56 ppm, Number of Pump Strokes 2
Sampling Time: 2 minute per pump stroke
Colour Change: Pale yellow → Pale bluish green
Reaction Principle: CH3OH + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 15% (for 2 to 5 ppm), 10% (for 5 to 20 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range
2 to 20 ppm 20 to 56 ppm
Number of Pump Strokes
4 2
Correction Factor
1 2.8
Sampling Time 2 minutes per pump stroke
Detecting Limit 0.2 ppm (n=4)
Colour Change Pale yellow → Pale bluish green
Reaction Principle CH3OH + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation 15% (for 2 to 5 ppm), 10% (for 5 to 20 ppm)
Shelf Life 2 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 bluish green
Aromatic hydrocarbons   + Pale bluish green
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
200 ppm 250 ppm 6 to 36%

 

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