Closed chamber inert cycle validation procedure consists of measuring pressure variation, presence of inert gas and oxygen level in chamber after injecting inert gas

摘要

The procedure, for use in industrial production to ensure that a chamber (100) is rendered inert, consists of 1) measuring the pressure variation in the chamber after reducing the pressure inside it to below atmospheric, 2) checking that the depression is stable over a period of time, 3) verifying the presence of an inert gas upstream of the chamber during the gas feed cycle, 4) measuring the variation in the proportion of oxygen in the chamber following the inert gas injection, and 5) checking that the pressure inside the chamber is the same as atmospheric. Stages 1) and 2) are repeated as necessary, and an alarm system sets off a signal when there is a fault in any of the stages.