Ozone Detection Tubes (4 to 400 ppm)
Gastec Detection Tube No. 18M measures Ozone with a Range of 4 to 400 ppm.
- Measuring Range:
- 4 to 20 ppm
- 20 to 200 ppm
- 200 to 400 ppm
- Number of Pump Strokes: 2 to 5, 1, 1/2
- Correction Factor: 1/2 to 1/5, 1, 1/2
- Sampling Time: 45 seconds per pump stroke
- Detecting Limit: 1 ppm (5 pump strokes)
- Changes from Orange to Pale Yellow
- Corrections for temperature & humidity: Unnecessary
- Reaction Principle: O3 + Indicator → Reaction product
- Coefficient of Variation: 10% (for 20 to 60 ppm), 5% (for 60 to 200 ppm)
- 3 Year Shelf Life
- Store the tubes at cool and dark place.
Possible coexisting substances and their interferences:
| Substance |
Interference |
Changes color by itself to |
| Chlorine |
+ |
Pale yellow |
| Nitrogen dioxide |
+ |
Pale yellow |
| Boron trichloride |
No |
Red |
| Arsine |
No |
Red |
| Hydrogen chloride |
No |
Red |
| Hydrogen fluoride |
No |
Red |
| Phosphine |
No |
Red |
Ozone Detection Tubes (4 to 400 ppm)
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