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Tube de perméation
Description du produit
Permeation tubes are small containers filled with a pure chemical compound in a two-phase equilibrium between its gas phase and liquid phase. The containers are in suitable inert polymeric material and at a constant temperature; the device emits the compound through permeable wall with a constant rate.The permeate is mixed with a carrier gas at a controlled flow rate to obtain a known mixture used as reference in gas testing equipment.A wide range of permeation rates can be made, normally from 20μg/min to 500 μg/min, and accurate, stable concentrations range from ppb to high ppm.