Methylene Chloride Detection Tubes (20 to 500 ppm)

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Item #: 138
MFG: GasTec

UOM: Box of 10

$94.13 Was: $103.59
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Methylene Chloride Detection Tubes (20 to 500 ppm)

Gastec Detection Tube No. 138 measures Methylene Chloride with a Range of 20 to 500 ppm.

  • Measuring Range: 20 to 50 ppm, 50 to 500 ppm
  • Number of Pump Strokes: 2, 1
  • Correction Factor: 0.4, 1
  • Sampling Time: 3 minutes per pump stroke
  • Detecting Limit: 10 ppm (2 pump strokes)
  • 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 50 to 100 ppm), 10% (for 100 to 500 ppm)
  • Changes from White to Pale Pink
  • 3 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 Interference Changes color by itself
Chlorine, Bromine, Iodine + Pale pink
Unsatruated halogenated HCs + Pale pink
Saturated halogenated HCs + Pale pink

Other substance measurable with this detector tube:

Substance: Correction Factor: No. of Pump Strokes: Measuring Range:
Ethyl Chloride 0.3 1 15 to 150 ppm