{"schemaVersion":1,"slug":"iec-optical-beam-detector-plan-symbol","name":"Optical beam smoke detector plan symbol","kind":"symbol","abbreviation":"BD","aliases":["beam detector","linear smoke detector","projected beam detector"],"category":"installation-communications","drawingTypes":["GA"],"referenceFamilies":["IEC"],"summary":"Plan symbol for a linear optical beam smoke detector, showing transmitter, receiver or reflector and the beam path.","description":["Optical beam detectors protect large open spaces such as warehouses and atriums by projecting an infrared beam across the space. Plans show a transmitter and receiver, or a combined unit and reflector, linked by a dashed beam line drawn to length.","The beam path must remain clear of obstructions, and mounting surfaces must be stable so the beam stays aligned. The plan helps coordinate with racking, cranes and structure. The symbol does not state beam length limits or alignment tolerance. Product data sets these."],"readingNotes":["Check the beam path is clear.","Identify transmitter, receiver or reflector ends."],"drawingChecklist":["Show both ends and beam line.","State beam length.","Check mounting stability."],"distinction":"A point smoke detector covers a radius; a beam detector covers a line across a space.","facts":[{"label":"Coverage","value":"Line of sight across open space"},{"label":"Components","value":"Transmitter and receiver, or unit and reflector"},{"label":"Exact standard graphic","value":"Not reproduced here; confirm the form against IEC 60617 and the project legend"}],"references":[{"sourceId":"iec-diagrams","relevance":"IEC graphical symbol context for installation plans; independently drawn here."},{"sourceId":"iec-public-radiation","relevance":"Public IEC-oriented radiation qualifiers relevant to optical and infrared detection marks."}],"related":["iec-smoke-detector-plan-symbol","iec-signal-transmission-qualifier"],"artwork":"s28-iec-optical-beam-detector-plan-symbol","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEC","form":"Optical beam detector","reference":"IEC 60617 installation-plan style (architectural and topographical installation symbols); independently drawn, not certified IEC geometry or a database identifier."},"plainEnglish":{"title":"What does Optical beam smoke detector plan mean?","introduction":"Optical beam detectors protect large open spaces such as warehouses and atriums by projecting an infrared beam across the space. Plans show a transmitter and receiver, or a combined unit and reflector, linked by a dashed beam line drawn to length.","example":"The beam path must remain clear of obstructions, and mounting surfaces must be stable so the beam stays aligned. The plan helps coordinate with racking, cranes and structure. The symbol does not state beam length limits or alignment tolerance. Product data sets these.","drawings":"Check the beam path is clear. Identify transmitter, receiver or reflector ends. A point smoke detector covers a radius; a beam detector covers a line across a space.","terms":[{"name":"Schematic","meaning":"A drawing showing function and connections rather than physical appearance."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"IEC graphical symbols for diagrams","url":"https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/"},{"label":"Autodesk IEC-60617 preview: Radiation qualifiers","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EABC81B4-549D-49C9-A0F5-086DD204A689.htm"}],"detail":"Plan symbol for a linear optical beam smoke detector, showing transmitter, receiver or reflector and the beam path. A point smoke detector covers a radius; a beam detector covers a line across a space.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/iec-optical-beam-detector-plan-symbol","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/iec-optical-beam-detector-plan-symbol.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"iec-diagrams","title":"IEC graphical symbols for diagrams","publisher":"IEC","url":"https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/","type":"standard","scope":"IEC 60617 and related symbol-design publications. Full database access requires a subscription.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"IEC graphical symbol context for installation plans; independently drawn here."},{"id":"iec-public-radiation","title":"Autodesk IEC-60617 preview: Radiation qualifiers","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-EABC81B4-549D-49C9-A0F5-086DD204A689.htm","type":"cad-reference","scope":"Public publisher IEC-context family names and vendor block references. No vendor images or CAD library files are reproduced, and vendor tokens are not presented as verified IEC database identifiers.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEC-oriented radiation qualifiers relevant to optical and infrared detection marks."}]}