Gastec 121 苯气体检测管 C6H6(2.5~120 ppm)

Indicator: 5 to 60 ppm
Measuring Range: 
+ 2.5 to 5 ppm, Number of Pump Strokes 4
+ 5 to 60 ppm, Number of Pump Strokes 2
+ 60 to 120 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Dark Green
Reaction Principle: C6H6 + I2O5→ H2S2O7 + I2
Coefficient of Variation: 10% (for 5 to 20 ppm), 5% (for 20 to 60 ppm)
Nr. of tests: 10
Pump: GV-100S/110S

Detail

Catalog

Manual

Manual tube

Performance
Measuring Range
2.5 to 5 ppm 5 to 60 ppm 60 to 120 ppm
Number of Pump Strokes
4 2 1
Correction Factor
1/2 1 2
Sampling Time 1.5 minutes per pump stroke
Detecting Limit 0.5 ppm (n=4)
Colour Change White → Dark Green
Reaction Principle C6H6 + I2O5→ H2S2O7 + I2
Coefficient of Variation 10% (for 5 to 20 ppm), 5% (for 20 to 60 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
Alcohols, Ketones 1% No No
Esters 2000 ppm + No
Aliphatic hydrocarbons   No Pale brown
Aromatic hydrocarbons   + Dark green
Other substance measurable with this detector tube
Substance Correction Factor No. of pump strokes Measuring Range
Diisobutylene Factor: 9 1 45 to 540 ppm
α-Pinene Factor 19 3 95 to 1140 ppm
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
0.5 ppm(2014) 2.5 ppm(2014) 1.3 to 7.1%

 

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