Indicator: 0.5 to 10 ppm
Measuring Range:
+ 0.1 to 0.25 ppm, Number of Pump Strokes 4
+ 0.25 to 10 ppm, Number of Pump Strokes 2
+ 10 to 25 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: Bluish purple → White
Reaction Principle: SO2 +I2 +2H2O → H2SO4 + 2HCl
Coefficient of Variation: 10% (for 0.25 to 2 ppm), 5% (for 2 to 10 ppm)
Nr. of tests: 10
Pump: GV-100S/110S
Catalog
Manual
Manual tube
Performance
| Measuring Range |
| 0.1 to 0.25 ppm |
(0.25) to 10 ppm |
10 to 25 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
0.02 ppm (n=4) |
| Colour Change |
Bluish purple → White |
| Reaction Principle |
SO2 +I2 +2H2O → H2SO4 + 2HCl |
| Coefficient of Variation |
10% (for 0.25 to 2 ppm), 5% (for 2 to 10 ppm) |
| Shelf Life |
3 Years |
| Corrections for temperature & humidity |
Temperature correction is necessary |
| Store the tubes at cool and dark place. |
Possible coexisting substances and their interferences
(NOTE)
| Substance |
Concentration |
Interference |
Change colour by itself to |
| Nitrogen dioxide |
|
(Unclear demarcation) |
Brown (approx.1mm long from the inlet) |
| Hydrogen sulphide |
≧ 1/10 |
+ |
White |
| Calibration gas generation |
Permeation tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| - |
0.25 ppm (2014) |
- |
