PLC I/O
PLC input / output
A controller interface point connecting field signals to an identified module channel.
Schematic
Symbols · FS LIQ
Liquid flow switch
A liquid-flow switch issues a contact state when a documented flow condition actuates it.
Schematic · FS LIQ
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
A distinction that matters
A flow switch gives a discrete condition; a flow transmitter gives a measured signal.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Level, flow, keyed and measurement switches
Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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