Gastec 121S 苯气体检测管 C6H6(2~312 ppm)

Indicator: 5 to 120 ppm
Measuring Range: 
+ 2 to 5 ppm, Number of Pump Strokes 4
+ 5 to 120 ppm, Number of Pump Strokes 2
+ 120 to 312 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: White → Dark green
Reaction Principle: C6H6 + I2O5 + H2S2O7 → I2
Coefficient of Variation: 20% (for 5 to 40 ppm), 15% (for 40 to 120 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range
2 to 5 ppm 5 to 120 ppm 120 to 312 ppm
Number of Pump Strokes
4 2 1
Correction Factor
0.4 1 2.6
Sampling Time 2 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 20% (for 5 to 40 ppm), 15% (for 40 to 120 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
Hexane 100 ppm No No
Toluene 200 ppm No No
Xylene 300 ppm No No

Aromatic hydrocarbons other than benzene are trapped in the brown layer in the pretreatment tube.
If the pretreatment reagent is entirely consumed (whole brown layer turns to dark brown), a higher reading will be given.
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
0.5 ppm 2.5 ppm 1.3 to 7.1%

 

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