Benzene Detection Tubes (0.125 to 65 ppm)

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Item #: 121L
MFG: GasTec
UOM: Box of 10
Min Order: 0
Order Qty: Must order in multiples of 1
$78.79 Was: $89.73
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Benzene Detection Tubes (0.125 to 65 ppm)

Gastec Detection Tube No. 121L measures Benzene with a range of 0.1 to 65 ppm.

  • Measuring Range:
    • 0.1 to 10 ppm - 5 pump strokes
      Correction Factor: 1
    • 10 to 65 ppm - 1 pump stroke
      Correction Factor: 6.5
  • Sampling Time: 2 minutes per pump stroke
  • Detecting Limit: 0.05 ppm (5 pump strokes)
  • Changes from White to Dark Green
  • Corrections for temperature & humidity: Unnecessary
  • Relative standard deviation: 10% (for 0.1 to 3 ppm), 5% (for 3 to 10 ppm)
  • 3 Year Shelf Life
  • Reaction Principle: C6H6 + I2O5 + H2S2O7 → I2
  • Store the tubes at a cool and dark place
  • Comes in a box of 5 pre tubes and 5 detector tubes

Possible coexisting substances and their interferences:

Substance Concentration Interference Changes color by itself to
Alcohols, ketones No No
Ethyl benzene ≧ 1/1 + Blackish brown
Xylene ≧10 ppm + Blackish brown around zero point
Toluene ≧ 1/1 + Blackish brown
Hexane ≧ 3 ppm + (Unclear demarcation) No

Other substance measurable with this detector tube:

Substance: Correction Factor: No. of Pump Strokes: Measuring Range
Methylene Iodide 2.2 5 0.22 to 22 ppm
Methyl Iodide 3.2 5 0.32 to 32 ppm