ISO 11195:2018 specifies requirements for the performance and safety of stand-alone gas mixers intended for mixing oxygen with another gas for medical use.

ISO 11195:2018 does not apply to:

a) blocks of flowmeters with separate controls for the flow of each gas;

b) stand-alone gas mixers which mix oxygen with ambient air;

c) stand-alone gas mixers with more than two different gas inlets;

d) stand-alone gas mixers connected to an oxygen concentrator.