Gastec 11S Quick-measuring Detector tubes Nitrogen oxides NO+NO2 (5~625ppm)
ManufacturerGastec(View more products from this manufacturer)
Model11S
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Indicator: 20 to 250 ppm
Measuring Range:
+ 5 to 10 ppm, Number of Pump Strokes 2
+ 10 to 250 ppm, Number of Pump Strokes 1
+ 250 to 625 ppm, Number of Pump Strokes 1/2
Sampling Time: 45 seconds per pump stroke
Colour Change: White → Pale green
Reaction Principle: NO + Cr6+ + H2SO4 →NO2, NO2 + (C6H5)2NH → Pale green product
Coefficient of Variation: 10% (for 10 to 40 ppm), 5% (for 40 to 250 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 45 seconds per pump stroke | |||
| Detecting Limit | 2 ppm (n=2) | |||
| Colour Change | White → Pale green | |||
| Reaction Principle | NO + Cr6+ + H2SO4 →NO2 NO2 + (C6H5)2NH → Pale green product |
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| Coefficient of Variation | 10% (for 10 to 40 ppm), 5% (for 40 to 250 ppm) | |||
| Shelf Life | 2 Years | |||
| Corrections for temperature & humidity | Unnecessary | |||
| Store the tubes at cool and dark place. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Hydrogen chloride | 50 ppm | Unclear demarcation | Bluish purple (10 ppm) |
| Ozone | 80 ppm | Unclear demarcation (two layers) |
Pale brown |
| sulphur dioxide, Hydrogen sulphide |
1/1 | + | No |
| Methanol | 400 ppm |  |
No |
| Calibration gas generation | Permeation tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| NO2: 0.2 ppm(2014) NO: 25 ppm(2014) |
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