Gastec 193 便携式气体检测管2-戊烯腈检测管(CH3CH2CH:CHCN)(0.5~15ppm)

Indicator: 0.5 to 6.0 ppm
Measuring Range: 
+ 0.5 to 6.0 ppm, Number of Pump Strokes 4
+ 6.0 to 15 ppm, Number of Pump Strokes 2
Sampling Time: 2 minute per pump stroke
Colour Change: Yellow → Red
Reaction Principle: 
+ CH3CH2CH:CHCN + Cr6+ + H2SO4 → HCN
+ 2HCN+HgCl2 → 2HCl+ Hg(CN)2
+ HCl+Base → Chloride.
Coefficient of Variation: 10% (for 0.5 to 2 ppm), 5% (for 2 to 6 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range
0.5 to 6.0 ppm 6.0 to 15 ppm
Number of Pump Strokes
4 2
Correction Factor
1 2.5
Sampling Time 2 minutes per pump stroke
Detecting Limit 0.1 ppm(n=4)
Colour Change Yellow → Red
Reaction Principle CH3CH2CH:CHCN + Cr6+ + H2SO4 → HCN
2HCN+HgCl2 → 2HCl+ Hg(CN)2
HCl+Base → Chloride.
Coefficient of Variation 10% (for 0.5 to 2 ppm), 5% (for 2 to 6 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
Hydrogen chloride   No No
Hydrogen cyanide   No No
Nitriles (C3)   + Red
Acetone cyanohidrin   + Red
Alcohols, Esters, Ketones 20 ppm or higher No
Aromatic hydrocarbons 20 ppm or higher No

Note: Humidity scrubber removes humidity and acid gases.
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
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