Methylene Chloride Detection Tubes (4 to 150 ppm)

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Item #: 138L
MFG: GasTec

UOM: Box of 10

$90.12 Was: $96.34
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Methylene Chloride Detection Tubes (4 to 150 ppm)

Gastec Detection Tube No. 138L measures Methylene Chloride with a Range of 4 to 150 ppm.

  • Measuring Range:
    • 4 to 10 ppm
    • 10 to 60 ppm
    • 60 to 150 ppm
  • Number of Pump Strokes: 4, 2, 1
  • Correction Factor: 0.4, 1, 2.5
  • Sampling Time: 3 minutes per pump stroke
  • Detecting Limit: 3 ppm (4 pump strokes)
  • Changes from White to Pale Pink
  • Corrections for temperature & humidity: Temperature correction is necessary
  • Reaction Principle:
    • CH2Cl2 + CrO3 + H2S2O7 → Cl2
    • Cl2 + 3,3',5,5'-Tetramethylbenzidine → Pale pink product
  • Relative Standard Deviation: 15% (for 10 to 20 ppm), 10% (for 20 to 60 ppm)
  • 2 Year Shelf Life
  • Store the tubes at 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
Chlorine, Bromine, Iodine + Pale pink
Unsaturated halogenated HCs ≧ 6 ppm + Pale pink
Saturated halogednated HCs ≧ 3 ppm + Pale pink