{"schemaVersion":1,"slug":"61-density-switch-or-sensor","name":"Density switch or sensor","kind":"function","abbreviation":"61","aliases":["gas density sensor","density monitor","ANSI 61","IEEE device 61"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEEE / ANSI"],"summary":"Monitors the density of a medium used by electrical equipment.","description":["Monitors the density of a medium used by electrical equipment.","In a drafting package, connect this reference to the density sensor and monitored compartment. The associated drawing should trace the density alarm, lockout or operating permission; the number identifies the role and does not specify the terminal arrangement, ratings or operating settings."],"readingNotes":["Identify the density sensor and monitored compartment.","Trace the density alarm, lockout or operating permission."],"drawingChecklist":["Label the density sensor and monitored compartment.","Cross-reference the density alarm, lockout or operating permission.","Identify the device tag, manual revision and logic drawing that define this implementation."],"distinction":"Density is distinct from pressure; temperature-compensated gas-density supervision should not be relabelled as 63 solely because a gauge is present.","facts":[{"label":"ANSI / IEEE function number","value":"61"},{"label":"Drawing context","value":"The density sensor and monitored compartment"},{"label":"Application scope","value":"Protection or apparatus-control role; exact implementation is defined by the equipment documentation."}],"references":[{"sourceId":"pub-function-abb-secogear","relevance":"Public manufacturer number/name association. Drafting explanations are independently written."},{"sourceId":"ieee-functions","relevance":"Normative device-number publication; exact edition wording and compliance require the licensed standard."}],"related":["switchgear-panel","52-ac-circuit-breaker"],"artwork":"pub-function-box","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/protection-functions/61-density-switch-or-sensor","illustration":{"url":"https://eloragrid.ai/library/illustrations/61-density-switch-or-sensor.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-function-abb-secogear","title":"SecoGear medium-voltage switchgear application and technical guide, DET-882","publisher":"ABB","url":"https://library.e.abb.com/public/a06cf4cf38b34800b27bb337ab12f74f/DET-882%20SecoGear%205kV-15kV%20IEEE%20Metal%20Clad%20Switchgear_Application%20and%20installation%20guide.pdf","type":"manufacturer","scope":"Public switchgear application guide with a device-number reference table. Used to cross-check 54, 61, 62 and specialist labels. Text, photographs and manufacturer diagrams are linked only and are not redistributed.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public manufacturer number/name association. Drafting explanations are independently written."},{"id":"ieee-functions","title":"IEEE C37.2-2022: power-system device function numbers","publisher":"IEEE","url":"https://ieeexplore.ieee.org/document/9984140","type":"standard","scope":"Device function numbers, acronyms and contact designations. The full publication may require access through IEEE.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Normative device-number publication; exact edition wording and compliance require the licensed standard."}]}