This document specifies requirements for flow control devices that can be connected by the user either directly, by means of a probe or a gas-specific connector, or indirectly by means of a low-pressure hose assembly conforming with ISO 5359 to:
a)    a terminal unit conforming with ISO 9170-1 of a medical gas pipeline system conforming with ISO 7396-1:2016;
b)    the pressure outlet of a regulator conforming with ISO 10524-1:2018; or
c)    to the pressure outlet of a valve integrated pressure regulator (VIPR) conforming with ISO 10524-3 (see 5.2 gas inlets).
This document applies to the following types of flow control devices (FCDs):
a)    flowmeters;
b)    flowgauge FCDs; and
c)    fixed orifice FCDs.
NOTE       Flow control devices that are classed as medical electrical equipment can be subject to additional requirements of IEC 60601-1.
This document applies to flow control devices for the following gases:
—    oxygen;
—    oxygen 93 %;
—    nitrous oxide;
—    medical air;
—    carbon dioxide;
—    oxygen/nitrous oxide mixture 50/50 (% volume fraction);
—    oxygen-enriched air;
—    helium;
—    xenon; and
—    specified mixtures of the gases listed above.
NOTE Flow control devices can be available for other gases.
This document does not apply to flow control devices that are:
a)    for use with gases for driving surgical tools;
b)    an integral part of a regulator (see ISO 10524-1:2018); or
c)           an integral part of a valve with integrated pressure regulator (VIPR) (see ISO 10524-3).