On-site medical gas production plant and associated operating method

An on-site medical gas production plant (100), comprising:

• a gas purification unit (50) configured to produce a purified gas from a less pure supply gas source,
• a first compartment (A) for storing the purified gas, and
• a main gas line (10) fluidically connecting the gas purification unit (50) to the first storage compartment (A) so as to supply the said first storage compartment (A) with the purified gas coming from the gas purification unit (50),
• wherein the main gas line furthermore comprises:
• a actuated valve (VA) arranged on the main gas line (10) between the gas purification unit (50) and the first storage compartment (A), and furthermore connected to the atmosphere (at 12) via a vent line (11),
• an operating device (4) which controls the at least one actuated valve (VA),
• at least a first gas analysis device (D1) of which a first measurement line (29) is fluidically connected (at 28) to the main line (10), upstream of the actuated valve (VA), and which is electrically connected (200) to the operating device (4),
• and in which the operating device (4) is designed and adapted to act on the actuated valve (VA) in response to a signal received (210) from the gas analysis device (D1), so as to divert a gas present in the main pipe (10) to pass to the vent line (11) when the signal received (210) from the gas analysis device (D1) corresponds to a contamination signal based on an analysis of the gas in the main pipe (10), and simultaneously to prevent the gas present in the main pipe (10) from being sent to the said first storage compartment (A), and wherein the on-site medical gas production plant further comprises a valve controlled (110) bypass line (120) arranged to allow the purified gas from the gas purification unit (50) to bypass the main line (10) actuated valve (VA) and create a fluid communication directly from the gas purification unit (50) to the first storage compartment (A).