{"schemaVersion":1,"slug":"ansi-temperature-indicator","name":"ANSI/IEEE thermometer symbol","kind":"symbol","abbreviation":"T","aliases":["IEEE thermometer symbol","ANSI temperature indicator symbol","HIN1THM"],"category":"measurement-protection","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library thermometer instrument form for a local or panel temperature reading taken from a sensor input.","description":["The thermometer form is an indicating instrument circle whose input is a temperature sensor rather than a power circuit. On control schematics it sits at the end of a thermocouple, RTD or transmitter loop, so the important connections are the sensor wiring and any compensation or lead-resistance arrangement.","The symbol identifies indication only. Alarm and trip set points belong to separate switch or relay contacts, and the measuring range, sensor type and accuracy class must be read from the instrument schedule because the circle carries none of that information."],"readingNotes":["Follow the input back to the sensor and note its type (thermocouple, RTD or transmitter).","Look for separate contacts if the instrument also gives alarms."],"drawingChecklist":["Name the sensor and its location","State the range and units","Reference any alarm or trip contacts"],"distinction":"A thermometer indicates temperature; a temperature switch changes contact state at a set point and may have no display at all.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview, Instrumentation and Sensors"},{"label":"Public vendor block name","value":"HIN1THM / VIN1THM (Autodesk identifier; not an IEEE symbol number)"},{"label":"Typical inputs","value":"Thermocouple, RTD or 4-20 mA transmitter"},{"label":"Artwork scope","value":"Original functional illustration; exact standard glyph and compliance are not certified"}],"references":[{"sourceId":"ansi-autodesk-f44d5059-4728-40bd-b9ba-0de7cfdfaacf","relevance":"Public IEEE-oriented Instrumentation and Sensors preview listing the Thermometer block and its vendor identifier."},{"sourceId":"ieee-315","relevance":"Graphic-symbol standards context and official status; not a source of reproduced artwork."}],"related":["temperature-indicator","thermocouple","resistance-temperature-detector"],"artwork":"s28-ansi-temperature-indicator","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Autodesk IEEE-oriented Instrumentation and Sensors form: Thermometer","counterpart":"temperature-indicator","reference":"Autodesk publishes this block under its IEEE Symbol Preview. The counterpart is the matching functional concept in the library; no equivalence of every detailed standard graphic is asserted."},"plainEnglish":{"title":"What does ANSI/IEEE thermometer mean?","introduction":"The thermometer form is an indicating instrument circle whose input is a temperature sensor rather than a power circuit. On control schematics it sits at the end of a thermocouple, RTD or transmitter loop, so the important connections are the sensor wiring and any compensation or lead-resistance arrangement.","example":"The symbol identifies indication only. Alarm and trip set points belong to separate switch or relay contacts, and the measuring range, sensor type and accuracy class must be read from the instrument schedule because the circle carries none of that information.","drawings":"Follow the input back to the sensor and note its type (thermocouple, RTD or transmitter). Look for separate contacts if the instrument also gives alarms. A thermometer indicates temperature; a temperature switch changes contact state at a set point and may have no display at all.","terms":[{"name":"Normally open / normally closed","meaning":"The contact state in the normal condition defined for the drawing."},{"name":"Coil","meaning":"A wound conductor that can produce a magnetic field when energised."},{"name":"Terminal","meaning":"An identified point where a conductor connects."}],"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":"Autodesk IEEE Symbol Preview — Instrumentation and Sensors","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-F44D5059-4728-40BD-B9BA-0DE7CFDFAACF.htm"},{"label":"IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams","url":"https://standards.ieee.org/ieee/315/515/"}],"detail":"IEEE-library thermometer instrument form for a local or panel temperature reading taken from a sensor input. A thermometer indicates temperature; a temperature switch changes contact state at a set point and may have no display at all.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-temperature-indicator","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-temperature-indicator.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"ansi-autodesk-f44d5059-4728-40bd-b9ba-0de7cfdfaacf","title":"Autodesk IEEE Symbol Preview — Instrumentation and Sensors","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-F44D5059-4728-40BD-B9BA-0DE7CFDFAACF.htm","type":"cad-reference","scope":"Verified public IEEE-oriented vendor catalogue. Block names identify vendor symbols, not IEEE standard symbol numbers. Linked only; graphics and CAD files are not redistributed. IEEE/ANSI 315-1975 is a historical graphics reference with Inactive-Reserved status; this page does not certify current standards compliance.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEEE-oriented Instrumentation and Sensors preview listing the Thermometer block and its vendor identifier."},{"id":"ieee-315","title":"IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams","publisher":"IEEE Standards Association","url":"https://standards.ieee.org/ieee/315/515/","type":"standard","scope":"Graphic symbols and designation letters. IEEE lists this edition as Inactive-Reserved; it is a historical reference, not a claim of current compliance.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Graphic-symbol standards context and official status; not a source of reproduced artwork."}]}