BAS EN 13220:2003

1.1 This European Standard applies to: - Flow-metering devices which are connected and disconnected by the operator at terminal units of a medical gas pipeline system for measurement and delivery of medical gases. They can be connected either directly or by means of flexible connecting assemblies. - Flow-metering devices which are connected and disconnected by the operator at gas-specific connection points of devices such as pressure regulators. 1.2 It applies only to flow-metering devices for the following medical gases: - oxygen - nitrous oxide - air for breathing - carbon dioxide - helium - xenon - specified mixtures of the gases listed above - oxygen/nitrous oxide mixture (50/50 % V/V). 1.3 Electrical or electronic flow-metering devices are excluded from the scope of this standard.