Indicator: 10 to 60 ppm
Measuring Range:
+ 4 to 10 ppm, Number of Pump Strokes 4
+ 10 to 60 ppm, Number of Pump Strokes 2
+ 60 to 150 ppm, Number of Pump Strokes 1
Sampling Time: 3 minute per pump stroke
Colour Change: White → Pale Pink
Reaction Principle: CH2:Cl2 + CrO3 + H2S2O7 → Cl2
Coefficient of Variation: 15% (for 10 to 20 ppm), 10% (for 20 to 60 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
| 4 to 10 ppm |
10 to 60 ppm |
60 to 150 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
3 minutes per pump stroke |
| Detecting Limit |
5 ppm (n=2) |
| Colour Change |
White → Pale Pink |
| Reaction Principle |
CH2:Cl2 + CrO3 + H2S2O7 → Cl2
Cl2+ 3,3,5,5-Tetramethylbenzidine → Holoquinone |
| Coefficient of Variation |
15% (for 10 to 20 ppm), 10% (for 20 to 60 ppm) |
| Shelf Life |
2 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 |
| Cl2, Br2, I2 |
|
+ |
Pale pink |
| Unsaturated halogenated HCs |
6 ppm |
+ |
Pale pink |
| Saturated halogenated HCs |
3 ppm |
+ |
Pale pink |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 50 ppm |
- |
15.5 to 66.9% |
