Liquid-level actuation qualifier

What it represents

This qualifier identifies actuation responding to liquid level. Level is the process condition that initiates operation. It should be distinguished from a drawing of the level instrument, the electrical output contact and the control action that follows.

In a generator fuel system, for example, a level input may participate in pump control or an alarm. The qualifier identifies the input principle while the cause-and-effect schedule states what happens.

How to read it

• State the sensed vessel or level point and the associated contact condition.
• A level-actuation qualifier does not provide a setpoint or switch mounting height.

Information to show or reference

• Identify the associated device, circuit or diagram boundary.
• State the sensed vessel or level point and the associated contact condition.
• 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