Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

IEEE / ANSI

ANSI/IEEE thermocouple with terminal board symbol

This form adds the terminal board in the thermocouple head to the basic junction symbol. It is useful on loop and wiring diagrams because the terminal board marks the boundary between the element, which is replaced with the sensor, and the field extension cable, which stays in place.

Drawing use: Schematic
Application: Metering & protection
Reference family: IEEE / ANSI / Manufacturer
Form evidence: Autodesk IEEE-oriented Instrumentation and Sensors form: Thermocouple with Terminal Board. 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.

A distinction that matters

The terminal-board form shows the head connection point; the plain thermocouple form shows only the junction and leads.

Full reference

HTC1LTB

IEC

Thermocouple with terminal board

This representation distinguishes a thermocouple circuit expanded to show its terminal-board interface.

Drawing use: Schematic
Application: Metering & protection
Reference family: IEC / Manufacturer
Form evidence: Thermocouple with terminal board. Autodesk IEC-60617 Symbol Preview — Instrumentation and sensor family reference; vendor family reference, not certified IEC geometry or database identifier.

A distinction that matters

Adding a terminal board does not make a thermocouple circuit an ordinary copper voltage circuit.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.