Gastec 130L 快速偏二氯乙烯测量探测管CH2:CCl2(0.4~40.6 ppm)

Indicator: 1 to 14 ppm
Measuring Range: 
+ 0.4 to 1 ppm, Number of Pump Strokes 2
+ 1 to 14 ppm, Number of Pump Strokes 1
+ 14 to 40.6 ppm, Number of Pump Strokes 1/2 (45 seconds per of  pumb stroke)
Sampling Time: 1.5 minute per pump stroke
Colour Change: Yellow → Reddish brown
Reaction Principle: CH2:CCl2 + Cr6+ + H2SO4 → HCl, HCl+ Base → Reddish brown product 
Coefficient of Variation: 10% (for 1 to 4 ppm), 5% (for 4 to 14 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range
0.4 to 1 ppm 1 to 14 ppm 14 to 40.6 ppm
Number of Pump Strokes
2 1 1/2
Correction Factor
0.4 1 2.9
Sampling Time
1.5 minutes per pump stroke 45 seconds
Detecting Limit 0.1 ppm (n=2)
Colour Change Yellow → Reddish brown
Reaction Principle CH2:CCl2 + Cr6+ + H2SO4 → HCl
HCl+ Base → Reddish brown product
Coefficient of Variation 10% (for 1 to 4 ppm), 5% (for 4 to 14 ppm)
Shelf Life 2 Years
Corrections for temperature & humidity Unnecessary
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 300 ppm No
Vinyl chloride 1/7 + Reddish brown
Tetrachloroethylene 4 times + Reddish brown
Trichloroethylene 1/1 + Reddish brown
Toluene 500 ppm No
Benzene 400 ppm No
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
5 ppm(2014) - 5.6 to 11.4%
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