Nitrogen Oxides Detection Tubes (5 to 625 ppm)

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Item #: 11S
MFG: GasTec
UOM: Box of 10
Min Order: 0
Order Qty: Must order in multiples of 1
$88.56 Was: $98.92
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Product Details

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.

Nitrogen Oxides Detection Tubes (5 to 625 ppm)

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