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Calibration gas standards
  from VICI Metronics

  Dynacal® permeation tubes and wafer devices
Permeation tubes and wafer devices are small, inert capsules which emit a stable concentration of a specific trace chemical. The typical application involves inserting a device into the carrier flow of a gas analyzer to generate a test atmospheres for calibration, but they are ideal for any situation requiring a stable concentration.
  Dynacalibrator® calibration gas generators
Dynacalibrators utilize permeation devices to deliver precise concentrations from ppb to high ppm. All models feature a front-access permeation chamber with a proprietary constant temperature system to facilitate accurate, reproducible, trouble-free calibrations time after time.

 

Advantages over bottled gas standards

Calibration devices from VICI Metronics offer several advantages over cylinder-supplied gas calibration standards.

Multi-component gas mixtures can be easily generated by using the appropriate combination of permeation devices. The technique also allows the removal of a single component from a gas mixture by simply removing the appropriate permeation device. Concentrations are generated with NIST traceability using established EPA and ASTM protocols.

By contrast, bottled trace level (ppb and ppm) standards can be very expensive, and calibrations requiring multiple components over a wide range of concentrations require a large number of gas cylinders, consuming valuable lab space as well. Problems can also arise from degradation of the standard within the cylinder, from changes in the calibration levels as the cylinder pressure changes, and from interaction of calibration components and surfaces.