Gastec 131L 快速偏二氯乙烯测量探测管 CH2:CCl2(0.1-6.6ppm)

Indicator: 0.2 to 3.0 ppm
Measuring Range: 
+ 0.1 to 0.2 ppm, Number of Pump Strokes 4
+ 0.2 to 3.0 ppm, Number of Pump Strokes 2
+ 3.0 to 6.6 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Reddish brown
Reaction Principle: CH2:CHCl + Cr6+ + H2SO4 → HCl, HCl + Base → Chlorides
Coefficient of Variation: 10% (for 0.2 to 1.0 ppm), 5% (for 1.0 to 3.0 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Detail

Catalog

Manual

Manual tube

Performance
Measuring Range
0.1 to 0.2 ppm 0.2 to 3.0 ppm 3.0 to 6.6 ppm
Number of Pump Strokes
4 2 1
Correction Factor
1/2 1 2.2
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 0.02 ppm (n=4)
Colour Change Yellow → Reddish brown
Reaction Principle CH2:CHCl + Cr6+ + H2SO4 → HCl
HCl + Base → Chlorides
Coefficient of Variation 10% (for 0.2 to 1.0 ppm), 5% (for 1.0 to 3.0 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
Ethylene 200 ppm No
Tetrachloroethylene 1/3 + Reddish brown
Trichloroethylene 1/5 + Reddish brown
Benzene, Toluene 200 ppm No
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
Allyl chloride Factor: 16 2 3.2 to 48 ppm
1,1,2,2-Tetrachloroethane Factor: 10 2 2 to 30 ppm
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
1 ppm (2014) - 3.6 to 23%
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