Gastec 123 二甲苯检测管 C6H4(CH3)2(5~625ppm)

Indicator: 20 to 250 ppm
Measuring Range: 
+ 5 to10 ppm, Number of Pump Strokes 2
+ 10 to 250 ppm, Number of Pump Strokes 1
+ 250 to 625 ppm, Number of Pump Strokes 1/2
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Brown
Reaction Principle: C6H4(CH3)2 + I2O5 + H2SO4 → I2
Coefficient of Variation: 10% (for 10 to 50 ppm), 5% (for 50 to 250 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Manual tube

Performance
Measuring Range
5 to10 ppm 10 to 250 ppm 250 to 625 ppm
Number of Pump Strokes
2 1 1/2
Correction Factor
1/2 1 2.5
Sampling Time
1.5 minutes per pump stroke 1 minute
Detecting Limit 1 ppm (n=2)
Colour Change White → Brown
Reaction Principle C6H4(CH3)2 + I2O5 + H2SO4 → I2
Coefficient of Variation 10% (for 10 to 50 ppm), 5% (for 50 to 250 ppm)
Shelf Life 3 Years
Corrections for temperature & humidity Unnecessary
Store the tubes at cool and dark place.
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Carbon Monoxide ≦ 1000 ppm No(Two layers) Pale brown
(Whole layer)
Acetylene, Hexane 2000 ppm No(Two layers) Pale brown
(Whole layer)
Toluene ≧ 1/5 + Brown
Benzene ≧ 1/5 + Pale yellow
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
Trimethylbenzene by scale 2 10 to 300ppm
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
100 ppm(2014) 150 ppm(2014) 1.0 to 7.0%

 

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