Hearing aids - Specification for dimensions of the nipple and sealing device for insert earphones1 Scope This standard is applicable to insert earphones which can be fitted to an earmould inserted into the ear canal.

whether the dust is in a cloud or layer

BS EN 4186 provides specifications on unions

Note:  Safety requirements are not covered by BS EN 62756-1

BS ISO 464:2015 includes some technical and editorial changes with respect to BS ISO 464:1995

The quality plans are to be applied as specified in the contract documents

Explanations for the long-term safety factors incorporated into the GRP system standards based on simplified probabilistic methods are provided in Annex G

the current subject field may be indicated in angle brackets

Ageing tests are also covered

BS EN ISO 780:2015 supersedes BS EN ISO 780:1999

ISO 235002

together with general dimensions

The sensing element can be the fibre itself or an optically powered element inserted along the optical path