Gastec 131LB 快速偏二氯乙烯测量探测管 CH2:CCl2(0.25-70ppm)

Indicator: 1 to 20 ppm
Measuring Range: 
+ 0.25 to 1 ppm, Number of Pump Strokes 4
+ 1 to 20 ppm, Number of Pump Strokes 2
+ 20 to 70 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Purple
Reaction Principle: CH2:CHCl + PbO2 + H2SO4 → HCl, HCl + Base → Purple
Coefficient of Variation: 10% (for 1 to 5 ppm), 5% (for 5 to 20 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Manual tube

Performance
Measuring Range
0.25 to 1 ppm 1 to 20 ppm 20 to 70 ppm
Number of Pump Strokes
4 2 1
Correction Factor
1/4 1 3.5
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 0.05 ppm (n=4)
Colour Change Yellow → Purple
Reaction Principle CH2:CHCl + PbO2 + H2SO4 → HCl
HCl + Base → Purple
Coefficient of Variation 10% (for 1 to 5 ppm), 5% (for 5 to 20 ppm)
Shelf Life 2 Years
Corrections for temperature & humidity Temperature correction is necessary
Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Chlorine, Hydrogen chloride ≧ 1/10 + Purple
Alcohols, Esters, Ketones   No No
1,2-Dichloroethylene 1/10 + Purple
Trichloroethylene,
Tetrachloroethylene
1/10 + Purple
Aromatic hydrocarbons   No No
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
1 ppm (2014) - 3.6 to 23%

 

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