Benzene Detection Tubes (0.2 to 66 ppm)
Gastec Detection Tube No. 121SP measures Benzene with a Range of 0.2 to 66 ppm.
- Measuring Range:
- 0.2 to 20 ppm - 3 pump strokes
Correction factor: 1
- 20 to 66 ppm - 1 pump stroke
Correction factor: 3.3
- Sampling Time: 2 minutes per pump stroke
- Detecting Limit: 0.1 ppm (3 pump strokes)
- Color Change: White to Brown
- Corrections for temperature & humidity: Unnecessary
- Relative Standard Deviation: 10% (for 0.2 to 5ppm) , 5% (for 5 to 20 ppm)
- 2 Year Shelf Life
- Reaction Principle:
- 2C6H6 + HCHO → C6H5 - CH2 - C6H5
- C6H5 - CH2 - C6H5 + H2S2O7 → Reaction product
- Store the tubes at a 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 |
≦ 500 ppm |
No |
No |
| Toluene |
≦ 300 ppm |
No |
No |
| Xylene |
≦ 350 ppm |
No |
No |
Benzene Detection Tubes (0.2 to 66 ppm)
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