# Liquid flow switch

Canonical URL: https://eloragrid.ai/symbols/liquid-flow-switch
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: FS LIQ
Drawing use: Schematic
Reference families: IEC, Manufacturer

A liquid-flow switch issues a contact state when a documented flow condition actuates it.

## What it represents

A liquid-flow switch issues a contact state when a documented flow condition actuates it. It is used in cooling or auxiliary systems where flow confirmation participates in permissives or alarms.

## How to read it

- Identify whether the contact indicates sufficient flow or loss of flow.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.

## Information to show or reference

- Name fluid circuit
- State operate flow condition
- Show contact destination

## Important distinction

A flow switch gives a discrete condition; a flow transmitter gives a measured signal.

## Facts

- Drawing role: Actuated indication
- Representation scope: Functional concept; not an official standard graphic or a product footprint
- Public vendor block reference: HFS11, VFS11 (Autodesk identifiers; not IEC symbol numbers)
- Identifier status: 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.

## Public references

- [AutoCAD Electrical: Level, flow, keyed and measurement switches](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1FB94435-C954-4479-BD97-25796DB8F728.htm) — Autodesk. Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source 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.