Indicator: 0.2 ~ 5.0 ppm
Measuring Range:
+ 0.04~0.08ppm, Number of Pump Strokes 8
+ 0.08ppm~0.2ppm, Number of Pump Strokes 4
+ 0.2~8.0ppm, Number of Pump Strokes 2
+ 5.0~16.5ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: White → Yellowish orange
Reaction Principle: NO + Cr6+ + H2SO4 →NO2, NO2 + o-Tolidine → Yellowish orange product
Coefficient of Variation: 10% (for 0.2 to 1 ppm), 5% (for 1 to 5 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Detail
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 2 minutes per pump stroke | ||||
| Detecting Limit | 0.01 ppm (n=8) | ||||
| Colour Change | White → Yellowish orange | ||||
| Reaction Principle | NO + Cr6+ + H2SO4 →NO2 NO2 + o-Tolidine → Yellowish orange product |
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| Coefficient of Variation | 10% (for 0.2 to 1 ppm), 5% (for 1 to 5 ppm) | ||||
| Shelf Life | 3 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 |
| Chlorine, Bromine, Chlorine dioxide |
+ | Yellowish orange | |
| sulphur dioxide | 25 ppm |  |
No |
| Hydrogen sulphide | 25 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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