Nitrogen Oxides Detection Tubes (5 to 625 ppm)

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Item #: 11S
MFG: GasTec

UOM: Box of 10

$88.56 Was: $98.92
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Nitrogen Oxides Detection Tubes (5 to 625 ppm)

Gastec Detection Tube No. 11S measures Nitrogen Oxides with a Range of 5 to 625 ppm.

  • Measuring Range:
    • 5 to 10 ppm
    • (10) to 250 ppm
    • 250 to 625 ppm
  • Number of Pump Strokes: 2, 1, 1/2
  • Correction Factor: 1/2, 1, 2.5
  • Sampling Time: 45 seconds per pump stroke
  • Detecting Limit: 2 ppm (2 pump strokes)
  • Changes from White to Pale Green
  • Corrections for temperature & humidity: Unnecessary
  • Reaction Principle:
    • NO + Cr6+ + H2SO4 → NO2
    • NO2 + (C6H5)2NH → C6H5NHC6H4NO
  • Relative Standard Deviation: 10% (for 10 to 80 ppm), 5% (for 80 to 250 ppm)
  • 2 Year Shelf Life
  • Store the tubes at cool and dark place.

Possible coexisting substances and their interferences:

Substance Concentration Interference Changes color by itself to
Hydrogen chloride ≧ 50 ppm Unclear demarcation Bluish purple (≧ 10 ppm)
Hydrogen sulfide ≧ 1/1 + No
Ozone ≧ 80 ppm Unclear demarcation
(Two layers)
Pale brown
Sulfur dioxide ≧ 1/1 + No
Methanol ≧ 400 ppm - No
Nitric oxide is oxidized to form nitrogen dioxide. If organic solvent of high concentration is coexisting, oxidising agent is deteriorated to produce minus error for Nitric oxide concentration.