Ophthalmic instruments. Perimeters Ingestion-build-89079 2nd or 3rd family gases

2nd or 3rd family gases in dwellings

BS EN 50085-2-2 does not apply to conduit systems

Industrial manufacturers of Batch control

BS EN 60439-3 gives supplementary requirements for enclosed distribution boards (DBU) which are stationary

Ophthalmic instruments. Perimeters Ingestion-build-89079 2nd or 3rd family gases1 Scope This International Standard specifies requirements and test methods for instruments designed to assess differential light sensitivity in the visual field by the subjective detection of the presence of test stimuli on a defined background. It does not apply to clinical methodologies and other psychophysical tests of the visual field. This International Standard takes precedence over ISO 15004, if differences exist.