Method and device for metering gas under pressure.

摘要

This method comprises the following steps: - injecting gas into a chamber (8) of known volume VO until a predetermined initial high pressure P1, which is markedly greater than a working pressure PO, is obtained, and closure of this chamber (8); - measurement of the temperature T of the gas inside the chamber (8); - storage of this temperature T; - calculation of a final mean pressure P2 by the formula: P2 = P1-mRT DIVIDED VO; and - ejection of a part of the gas by opening the chamber (8) to the working conduit (6) until the pressure of the gas contained in this chamber (8) reaches the value P2. Application to nitrogen/polymer mixers. <IMAGE>