Benzene Detection Tubes (1 to 100 ppm)

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Item #: 121SL
MFG: GasTec

UOM: Box of 10

$86.49 Was: $96.73
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Benzene Detection Tubes (1 to 100 ppm)

Gastec Detection Tube No. 121S measures Benzene With a Range of 1 to 100 ppm.

  • Measuring Range:
    • 1 to 20 ppm - 5 pump strokes
      Correction factor: 1
    • 20 to 100 ppm - 1 pump stroke
      Correction factor: 5
  • Sampling Time: 2 minutes per pump stroke
  • Detecting Limit: 0.25 ppm (5 pump strokes)
  • Color Change: White to Dark green
  • Corrections for temperature & humidity: Unnecessary
  • Relative Standard Deviation: 20% (for 1 o 5 ppm), 15% (for 5 to 20 ppm)
  • Reaction Principe: C6H6 + I2O5 + H2S2O7 → I2
  • 3 Year Shelf Life
  • Store the tubes at cool and dark place
  • Comes in a box of 5 detector tubes and 5 pre tubes

Possible coexisting substances and their interferences:

Substance Concentration Interference Changes color by itself to
Hexane ≦ 50 ppm No No
Toluene ≦ 100 ppm No No
Xylene ≦ 150 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.