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Anaesthetic and analgesic machines - Anaesthetic machines of the on-demand type supplied with nitrous oxide and oxygen from separate containers Ingestion-build-52208 BS EN 60601‑2‑40 on the1 Scope Part 1 of this British Standard specifies basic requirements primarily from the standpoint of performance and safety, for anaesthetic machines of the on demand type supplied with nitrous oxide and oxygen from separate containers, as used in dentistry and midwifery. Appendix B gives recommendations for periodic field testing of apparatus. NOTE BS 4272 2deals with analgesic machines of the on demand type supplied with premixed nitrous oxide and