Indicator: 100 ~ 2500 ppm
Measuring Range: 50 to 2500 ppm, Number of Pump Strokes 1
Sampling Time: 1.5 minute per pump stroke
Colour Change: White → Green
Reaction Principle: NO + Cr6+ + H2SO4 →NO2, NO2 + (C6H5)2NH → Green product
Coefficient of Variation: 10% (for 50 to 400 ppm), 5% (for 400 to 2500 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Performance
| Measuring Range | 50 to 2500 ppm |
| Number of Pump Strokes | 1 |
| Correction Factor | 1 |
| Sampling Time | 1.5 minutes per pump stroke |
| Detecting Limit | 10 ppm (n=1) |
| Colour Change | White → Green |
| Reaction Principle | NO + Cr6+ + H2SO4 →NO2 NO2 + (C6H5)2NH → Green product |
| Coefficient of Variation | 10% (for 50 to 400 ppm), 5% (for 400 to 2500 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 | 500 ppm | Unclear demarcation | Bluish purple ( 100 ppm) |
| Ozone | 200 ppm | Unclear demarcation two layers | Brown |
| sulphur dioxide, Hydrogen sulphide | No | No |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| NO2: 0.2 ppm(2014) NO: 25 ppm(2014) |
- | - |
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