Product Releases

Accurate Permeation Tubes

Mon, 10/17/2011 - 11:43am

Dynacal® permeation tubesVICI Metronics’ Dynacal® permeation tubes are small, inert capsules containing a pure chemical compound in a two-phase equilibrium between its gas phase and its liquid or solid phase. The tubes are characterized by:

  • At a constant temperature, the device emits the compound through its permeable portion at a constant rate; accurate, stable concentrations range from PPB to high PPM.
  • Permeation tube rates can be certified using standards traceable to NIST by the most basic and accurate laboratory procedure — measuring the gravimetric weight loss over a known period of time at a known temperature.
  • Devices are typically inserted into a carrier flow to generate test atmospheres for calibrating gas analyzer systems, testing hazardous gas alarms, or conducting long-term studies of effects on materials or biological systems — any situation requiring a stable concentration of a specific trace chemical.
  • Permeation rate data is already established for hundreds of different compounds, and rates for new compounds can be easily certified using NIST -traceable standards.



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