# Gas flow switch

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

A gas-flow switch changes contact state for a specified gas-flow condition.

## What it represents

A gas-flow switch changes contact state for a specified gas-flow condition. Its process connection and operating requirement belong in the equipment schedule as well as the control logic.

## How to read it

- Do not substitute liquid-flow characteristics for the selected gas device.
- 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

- Identify gas service
- Record operating condition
- Reference contact and reset action

## Important distinction

Gas-flow actuation is a process-specific input and is separate from the contact's electrical rating.

## Facts

- Drawing role: Actuated indication
- Representation scope: Functional concept; not an official standard graphic or a product footprint
- Public vendor block reference: HFS11S20, VFS11S20 (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.