Gastec 111L 甲醇检测管 CH3OH(20-1000ppm)

Indicator: 40 to 1000 ppm
Measuring Range: 
+ 20 to 40 ppm, Number of Pump Strokes 2
+ 40 to 1000 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: Pink → Pale blue
Reaction Principle: CH3OH + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation: 10% (for 40 to 200 ppm), 5% (for 200 to 1000 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Manual tube

Performance
Measuring Range
20 to 40 ppm 40 to 1000 ppm
Number of Pump Strokes
2 1
Correction Factor
1/2 1
Sampling Time 2 minutes per pump stroke
Detecting Limit 15 ppm (n=2)
Colour Change Pink → Pale blue
Reaction Principle CH3OH + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation 10% (for 40 to 200 ppm), 5% (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
Alcohols   + Pale blue
Acetone 1000 ppm + No discolouration up to 1000 ppm
Ethyl Acetate 500ppm No No discolouration up to 500 ppm
Toluene 300ppm No No discolouration up to 300 ppm
Benzene 70ppm No No discolouration
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
Ethylene Chlorohydrine by scale 3 80 to 200 ppm
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
200 ppm (2014) 250 ppm (2014) 6 to 36%

 

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