Indicator: 1 to 20 ppm
Measuring Range:
+ 1 to 20 ppm, Number of Pump Strokes 5
+ 20 to 100 ppm, Number of Pump Strokes 1
Sampling Time: 2 minutes per pump stroke
Colour Change: White → Dark Green
Reaction Principle: C6H6 + I2O5 + H2S2O7 → I2
Coefficient of Variation: 20% (for 1 to 5 ppm), 15% (for 5 to 20 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
| 1 to 20 ppm |
20 to 100 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
0.25 ppm (n=5) |
| Colour Change |
White → Dark Green |
| Reaction Principle |
C6H6 + I2O5 + H2S2O7 → I2 |
| Coefficient of Variation |
20% (for 1 to 5 ppm), 15% (for 5 to 20 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 |
| Hexane |
50 ppm |
No |
No |
| Toluene |
100 ppm |
No |
No |
| Xylene |
150 ppm |
No |
No |
Aromatic hydrocarbons other than benzene are trapped in the brown layer in the pretreatment tube.
If the pretreatment reagent is entirely consumed (whole brown layer turns to dark brown), a higher reading will be given. |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 0.5 ppm(2014) |
2.5 ppm(2014) |
1.3 to 7.1% |
