Benzene Detection Tubes (0.125 to 65 ppm)
Gastec Detection Tube No. 121L measures Benzene with a range of 0.1 to 65 ppm.
- Measuring Range:
- 0.1 to 10 ppm - 5 pump strokes
Correction Factor: 1
- 10 to 65 ppm - 1 pump stroke
Correction Factor: 6.5
- Sampling Time: 2 minutes per pump stroke
- Detecting Limit: 0.05 ppm (5 pump strokes)
- Changes from White to Dark Green
- Corrections for temperature & humidity: Unnecessary
- Relative standard deviation: 10% (for 0.1 to 3 ppm), 5% (for 3 to 10 ppm)
- 3 Year Shelf Life
- Reaction Principle: C6H6 + I2O5 + H2S2O7 → I2
- Store the tubes at a cool and dark place
- Comes in a box of 5 pre tubes and 5 detector tubes
Possible coexisting substances and their interferences:
| Substance |
Concentration |
Interference |
Changes color by itself to |
| Alcohols, ketones |
|
No |
No |
| Ethyl benzene |
≧ 1/1 |
+ |
Blackish brown |
| Xylene |
≧10 ppm |
+ |
Blackish brown around zero point |
| Toluene |
≧ 1/1 |
+ |
Blackish brown |
| Hexane |
≧ 3 ppm |
+ (Unclear demarcation) |
No |
Other substance measurable with this detector tube:
| Substance:
|
Correction Factor:
|
No. of Pump Strokes:
|
Measuring Range
|
| Methylene Iodide |
2.2 |
5 |
0.22 to 22 ppm |
| Methyl Iodide |
3.2 |
5 |
0.32 to 32 ppm |
Benzene Detection Tubes (0.125 to 65 ppm)
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