Alternative Air Source – New Guidelines

In Europe divers should be aware that there have been changes to European Standard EN250. This Standard concerns the manufacture of underwater breathing apparatus. The changes concern how alternate air sources are used.

As equipment manufactured under the requirements of the previous version of the standard will be around for many years, the implentation of these changes will be slow. However, divers should be aware of these changes and know when to implement some of the changes concerning the configuration of alternate air sources.

The main changes that will affect any regulators manufactured in accordance with the new (2014) version of the standard are as follows:

  • An octopus rig is not a preferred option if the depth is greater than 30m or the water temperature is less than 10°C, instead an alternative fully independent system is advised.
  • Regulator first stages which are not designed for cold water performance shall be marked with “>10°C”.
  • Regulator first stages may be marked with a lower working temperature if specified by the manufacturer.
  • Regulators first stages will be stamped with an “A” if they are compatible to be fitted with an alternate air source (octopus rig).

These changes will come into effect gradually as more regulators are manufactured according to the revised standard. If you have any questions on how you can use a particular regulator, you should approach the manufacturer for advice.

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