How do you get a 32% Nitrox mix?

An integral part of extended range diving is the use of different gas mixes. In some cases this might mean filling a tank with just a 28% Oxygen mix, in another case you might use both air and a 50% mix. In technical diving divers may use tri-mix which is composed of Helium, Nitrogen and Oxygen. If you plan to dive with such mixes it is important to understand how they are mixed, why different gas mixes are used and what the optimal mixes are for the dive that you are planning.

The SSI Extended Range Gas Blender certification is a non-diving speciality that is open to both certified and non-certified divers over the age of 18. This is a knowledge based course that concentrates on the physics maths and techniques that you need to be able to safely and correctly mix different breathing gases including tri-mix gases. If you are interested in becoming a technical diver or working in a dive centre this is a very useful specialisation to have.

• The SSI Extended Range Gas Blender speciality costs 250€. The course can be completed in two days and is open to divers and non-divers aged 18 and over.