快速支持
直接联系认证专家
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
| Measuring Range |
|
|||
| Number of Pump Strokes |
|
|||
| Correction Factor |
|
|||
| 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 |
|||
| 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. | ||||
| 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) |
- | - |
