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
Detail
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% |