Gastec 191 有机气体检测管; 丙烯腈 CH2:CHCN(2~360ppm)

Indicator: 5 to 120 ppm
Measuring Range: 
+ 2 to 5 ppm, Number of Pump Strokes 4
+ 5 to 120 ppm, Number of Pump Strokes 2
+ 120 to 360 ppm, Number of Pump Strokes 1
Sampling Time: 45 seconds per pump stroke
Colour Change: Yellow → Red
Reaction Principle: 10% (for 5 to 40 ppm), 5% (for 40 to 120 ppm)
+ Pretreatment tube: CH2:CHCN + Cr6+ + H2SO4 → HCN
+ Detector tube : 2HCN + HgCl2 → 2HCl + Hg(CN)2
+ HCl + Base → Chloride
Coefficient of Variation: 
Nr. of tests: 5
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range
2 to 5 ppm 5 to 120 ppm 120 to 360 ppm
Number of Pump Strokes
4 2 1
Correction Factor
0.4 1 3
Sampling Time 45 seconds per pump stroke
Detecting Limit 1 ppm (n=4)
Colour Change Yellow → Red
Reaction Principle

Pretreatment tube: CH2:CHCN + Cr6+ + H2SO4 → HCN
Detector tube : 2HCN + HgCl2 → 2HCl + Hg(CN)2
HCl + Base → Chloride

Coefficient of Variation 10% (for 5 to 40 ppm), 5% (for 40 to 120 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
Nitriles (C3) 10 ppm + Red
Acetone cyanohidrin 10 ppm + Red
Alcohols, Esters, Ketones     No
Aromatic hydrocarbons     No
Hydrogen chloride,
Hydrogen cyanide
    No
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
Propionnitrile 1.0 4 50 to 1200ppm
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
2 ppm (2014) - 3 to 17%

 

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