Liquid-flow actuation qualifier

What it represents

A liquid-flow qualifier identifies the process input operating a device. A flow-operated device responds to the movement of liquid through a documented process path. It can supply a switching condition without being a quantitative flow meter.

For a cooling-water interlock, keep the process connection, switch output and permissive logic separately identifiable. The circuit symbol does not supply the selected flow setting.

How to read it

• Show the process connection and the contact normal state separately.
• The qualifier does not establish a flow threshold or measuring accuracy.

Information to show or reference

• Identify the associated device, circuit or diagram boundary.
• Show the process connection and the contact normal state separately.
• Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.

Sources you can follow

These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.

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.

Entry JSON · Entry Markdown · Last editorial update: 14 October 2026