Accurate Permeation Tubes
VICI 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.