1.1 This International Standard is applicable to:
flow-metering devices which are connected, either directly or by means of flexible connecting asemblies, and disconnected by the operator at terminal units of a medical gas pipeline system for measurement and delivery of medical gases.
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:
air for breathing,
specified mixtures of the gases listed above,
oxygen/nitrous oxide mixture 50/50 (% volume fraction).
1.3 This International Standard is not applicable to electrical or electronic flow-metering devices.