Indicator: 5 to 120 ppm
Measuring Range:
+ 2 to 5 ppm, Number of Pump Strokes 4
+ 5 to 120 ppm, Number of Pump Strokes 2
+ 120 to 312 ppm, Number of Pump Strokes 1
Sampling Time: 2 minute per pump stroke
Colour Change: White → Dark green
Reaction Principle: C6H6 + I2O5 + H2S2O7 → I2
Coefficient of Variation: 20% (for 5 to 40 ppm), 15% (for 40 to 120 ppm)
Nr. of tests: 5
Pump: GV-100S/110S
Catalog
Manual
Performance
| Measuring Range |
| 2 to 5 ppm |
5 to 120 ppm |
120 to 312 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
2 minutes per pump stroke |
| Detecting Limit |
0.5 ppm (n=4) |
| Colour Change |
White → Dark green |
| Reaction Principle |
C6H6 + I2O5 + H2S2O7 → I2 |
| Coefficient of Variation |
20% (for 5 to 40 ppm), 15% (for 40 to 120 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 |
100 ppm |
No |
No |
| Toluene |
200 ppm |
No |
No |
| Xylene |
300 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 |
2.5 ppm |
1.3 to 7.1% |
