Nitrogen Oxides Detection Tubes (50 to 2500 ppm)
Gastec Detection Tube No. 11HA measures Nitrogen Oxides with a Range of (50) to 2500 ppm.
- Measuring Range: (50) to 2500 ppm
- No. of Pump Strokes: 1 (100 ml)
- Correction Factor: 1
- Sampling time: 1.5 minutes per pump stroke
- Detecting Limit: 10 ppm (1 pump stroke)
- Changes from White to Green
- Corrections for temperature & humidity: Unnecessary
- Reaction Principle:
- NO + Cr6+ + H2SO4 → NO2
- NO2 + (C6H5)2NH → C6H5NHC6H4NO
- Relative Standard Deviation: 10% (for 50 to 600 ppm), 5% (for 600 to 2500 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 |
≧ 500 ppm |
Unclear demarcation |
Bluish purple at 100 ppm |
| Ozone |
≧ 200 ppm |
Unclear demarcation (Two layers) |
Brown |
| Sulfur dioxide |
|
No |
No |
| Hydrogen sulfide |
|
No |
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 (50 to 2500 ppm)
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