Benzene Detection Tubes (1 to 100 ppm)
Gastec Detection Tube No. 121S measures Benzene With a Range of 1 to 100 ppm.
- Measuring Range:
- 1 to 20 ppm - 5 pump strokes
Correction factor: 1
- 20 to 100 ppm - 1 pump stroke
Correction factor: 5
- Sampling Time: 2 minutes per pump stroke
- Detecting Limit: 0.25 ppm (5 pump strokes)
- Color Change: White to Dark green
- Corrections for temperature & humidity: Unnecessary
- Relative Standard Deviation: 20% (for 1 o 5 ppm), 15% (for 5 to 20 ppm)
- Reaction Principe: C6H6 + I2O5 + H2S2O7 → I2
- 3 Year Shelf Life
- Store the tubes at cool and dark place
- Comes in a box of 5 detector tubes and 5 pre tubes
Possible coexisting substances and their interferences:
| Substance |
Concentration |
Interference |
Changes color 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. |
Benzene Detection Tubes (1 to 100 ppm)
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