Inexpensive calibration solution compared to bottled gases
Dynacal® perm tubes are small, inert capsules containing a pure chemical compound in a two-phase equilibrium between the gas phase and the liquid or solid phase. When held at a constant temperature (for example, in the permeation chamber of a Dynacalibrator), the device emits the compound through its permeable portion at a constant rate, up to 4000 ng/min.
The 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 chemical effects on materials or biological systems—in short, any situation requiring a stable concentration of a specific trace chemical.
Permeation rates are certified using standards traceable to NIST by the most basic and accurate laboratory procedure: measuring the gravimetric weight loss over a known time at a known temperature.
Permeation rate data is already established for hundreds of different compounds, and rates for new compounds can be easily certified using NIST -traceable standards.