# ANSI/IEEE Three-wire ultrasonic sensor form Canonical URL: https://eloragrid.ai/symbols/ansi-three-wire-ultrasonic-sensor Publisher: Elora Grid Updated: 2026-10-28 Lookup label: HPX11U3 Drawing use: Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: Normally Open 3 Wire Autodesk IEEE Symbol Preview: Ultrasonic Switches, block HPX11U3. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier. Related representation: [Three-wire ultrasonic sensor](https://eloragrid.ai/symbols/iec-three-wire-ultrasonic-sensor) IEEE-library form of three-wire ultrasonic sensor: this representation distinguishes a three-wire ultrasonic sensor interface from a simple contact depiction. ## In plain English ### What does ANSI/IEEE Three-wire ultrasonic sensor form mean? This reference locates three-wire ultrasonic sensor in Autodesk's IEEE-oriented ultrasonic switches family. This representation distinguishes a three-wire ultrasonic sensor interface from a simple contact depiction. The public library uses HPX11U3 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number. ### A simple example Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence. ### What the drawings help you do Identify supply, return and output from the selected device's terminal diagram. Three wires do not determine whether the output is sourcing, sinking or a particular voltage. Identify supply, return and output from the selected device's terminal diagram. Three wires do not determine whether the output is sourcing, sinking or a particular voltage. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted. ### This particular reference IEEE-library form of three-wire ultrasonic sensor: this representation distinguishes a three-wire ultrasonic sensor interface from a simple contact depiction. Three wires do not determine whether the output is sourcing, sinking or a particular voltage. ### Terms - Normally open / normally closed: The contact state in the normal condition defined for the drawing. - Terminal: An identified point where a conductor connects. - Signal: Electrical information passed between devices, rather than necessarily the main power supply. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Autodesk IEEE Symbol Preview: Ultrasonic Switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-B9F9E342-BC89-4736-B60A-5A2F326BF3BF.htm) ## What it represents This reference locates three-wire ultrasonic sensor in Autodesk's IEEE-oriented ultrasonic switches family. This representation distinguishes a three-wire ultrasonic sensor interface from a simple contact depiction. The public library uses HPX11U3 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number. Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence. Identify supply, return and output from the selected device's terminal diagram. Three wires do not determine whether the output is sourcing, sinking or a particular voltage. Identify supply, return and output from the selected device's terminal diagram. Three wires do not determine whether the output is sourcing, sinking or a particular voltage. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted. ## How to read it - Identify supply, return and output from the selected device's terminal diagram. - Three wires do not determine whether the output is sourcing, sinking or a particular voltage. ## Information to show or reference - Identify the associated device, circuit or diagram boundary. - Identify supply, return and output from the selected device's terminal diagram. - Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form. ## Important distinction Three wires do not determine whether the output is sourcing, sinking or a particular voltage. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: Ultrasonic Switches; published form: Normally Open 3 Wire. - Public vendor block: HPX11U3. Vendor library token, not an IEEE symbol number. - Information added: Identify supply, return and output from the selected device's terminal diagram. - Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic - Artwork scope: Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified. ## Public references - [Autodesk IEEE Symbol Preview: Ultrasonic Switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-B9F9E342-BC89-4736-B60A-5A2F326BF3BF.htm) — Autodesk. Public IEEE-oriented Ultrasonic Switches table explicitly lists HPX11U3 as Normally Open 3 Wire. This supports the vendor convention context, not reproduction of the publisher graphic. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.