{"schemaVersion":1,"slug":"thermocouple","name":"Thermocouple","kind":"symbol","abbreviation":"TC","aliases":["HTC1L","VTC1L"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A thermocouple produces a temperature-dependent voltage associated with its dissimilar-metal junction system.","description":["A thermocouple produces a temperature-dependent voltage associated with its dissimilar-metal junction system. Correct type, polarity and extension wiring matter when connecting it to an instrument."],"readingNotes":["Trace the thermocouple terminals and specified extension cable together.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["State thermocouple type","Mark polarity","Reference input and compensation arrangement"],"distinction":"A thermocouple generates a voltage signal; an RTD changes resistance.","facts":[{"label":"Drawing role","value":"Actuated indication"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HTC1L, VTC1L (Autodesk identifiers; not IEC symbol numbers)"},{"label":"Identifier status","value":"The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name."}],"references":[{"sourceId":"pub-symbol-instrumentation","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."},{"sourceId":"pub-symbol-temperature-input","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["plc-io","normally-open-contact"],"artwork":"edu-thermocouple","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/thermocouple","illustration":{"url":"https://eloragrid.ai/library/illustrations/thermocouple.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-symbol-instrumentation","title":"AutoCAD Electrical: Instrumentation and sensors","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-773A36C3-44C6-43EB-9BD0-E0297816B9B2.htm","type":"cad-reference","scope":"Public vendor catalogue naming and functional variants. Vendor block names are not IEC identifiers. Linked for reference; no graphics or CAD files are redistributed.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."},{"id":"pub-symbol-temperature-input","title":"RTD and thermocouple temperature transducer inputs","publisher":"Phoenix Contact","url":"https://www.phoenixcontact.com/en-gb/products/temperature-measuring-transducer-macx-mcr-1ts-i-olp-1145192?type=pdf","type":"manufacturer","scope":"Public manufacturer explanation of the equipment function and selection context.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}]}