ISO 15002:2008 is applicable to: flow-metering devices that are connected, either directly or by means of flexible connecting assemblies, and disconnected by the operator at terminal units of a medical gas pipeline system for flow adjustment, measurement and delivery of medical gases; flow-metering devices that are connected and disconnected by the operator at gas-specific connection points of devices such as pressure regulators. ISO 15002:2008 is applicable to: flow-metering devices intended to be used with the following medical gases: oxygen; nitrous oxide; medical air; carbon dioxide; oxygen/nitrous oxide mixture [50 %/50 % (by volume)] specified mixtures of the gases listed above; flow-metering devices intended to be used with the following gases: oxygen-enriched air; helium; xenon.