Advantages of Permeation Tubes & Devices
Calibration devices from VICI Metronics offer multiple advantages over cylinder-supplied gas calibration standards:
| Advantages of Permeation Devices |
Disadvantages of Bottled Standards |
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- Use of a pure substance in an inert matrix
- Precise concentrations of gases
- Rapid availability and ease of handling
- Multi-component gas mixtures are easily generated with NIST traceability using established EPA and ASTM protocols
- Simple to remove and/or add a single component
- Wide range of concentrations easily generated by varying the dilution flow rate and/or the setpoint temperature
- Obtain difficult-to-source chemicals in desired quantities
- No dangerous goods shipping or reporting required
- No oven or Dynacalibrator® required
- Minimal lab space required
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- Expensive due to rental fees and high disposal costs
- Substances are balanced in another medium
- Large number of gas cylinders needed for calibrations requiring multiple components over a wide range of concentrations
- Cylinders and equipment consume valuable lab space
- Possible degradation of standard within the cylinder:
- Changes in concentration levels due to changes in cylinder pressure
- Interaction of calibration components and surfaces
- Mutually reactive chemicals cannot be used
- Permitting may be required for some chemicals
- Specialized dangerous goods handling procedures may be required
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