Gastec 121SP快速检测管苯测试管 C6H6(0.2~66 ppm)

Indicator: 0.2 to 20 ppm
Measuring Range: 
+ 0.2 to 20 ppm, Number of Pump Strokes 3
+ 20 to 66 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: White → Brown
Reaction Principle: 2C6H6+ HCHO → C6H5CH2C6H5 + H2O, C6H5CH2C6H5 + H2S2O7 → Condensation polymer 
Coefficient of Variation: 10% (for 0.2 to 5ppm) , 5% (for 5 to 20 ppm)
Nr. of tests: 5
Pump: GV-100S/110S

Detail

Catalog

Manual

Performance
Measuring Range 0.2 to 20 ppm 20 to 66 ppm
Number of Pump Strokes 3 1
Correction Factor 1 3.3
Sampling Time 2 minutes per pump stroke
Detecting Limit 0.1 ppm (n=3)
Colour Change White → Brown
Reaction Principle 2C6H6+ HCHO → C6H5CH2C6H5 + H2O
C6H5CH2C6H5 + H2S2O7 → Condensation polymer
Coefficient of Variation 10% (for 0.2 to 5ppm) , 5% (for 5 to 20 ppm)
Shelf Life 2 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 ≦ 500 ppm No No
Toluene 300 ppm No No
Xylene 350 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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