For terminal operators, plant engineers, maintenance teams, and EPC specifiers who require dependable level monitoring in harsh or hazardous service, the Sonac 220 Ultrasonic Level Switch delivers a robust solution. This two-wire ultrasonic switch is engineered for reliable high- or low-level detection in liquids and slurries. Unlike mechanical floats or tuning forks, the Sonac 220 uses advanced ultrasonic technology with no moving parts, eliminating wear, reducing downtime, and providing long-term reliability and safety in demanding process and storage applications.
Eliminates mechanical failures, sticking, or clogging common with floats and levers, ensuring reliable activation.
Accurately detects high or low level in clean, viscous, or aerated liquids, and is immune to buildup, foam, or turbulence.
Available with approvals (UL, FM, ATEX) for safe installation in explosive atmospheres.
Solid-state electronics and a rugged design mean minimal servicing, no calibration drift, and a lower lifecycle cost.
Provides backup overfill or low-level alarms, reducing the risk of spills or pump damage.
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Technology |
Ultrasonic level switch, two-wire solid-state. |
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Operation |
Configurable for high-level or low-level detection (fail-safe selectable). |
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Accuracy |
Reliable switching independent of foam, turbulence, or viscosity. |
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Temperature Range |
–40 °F to +185 °F (–40 °C to +85 °C). |
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Pressure Rating |
Up to 150 PSIG (10 bar). |
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Materials of Construction
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Stainless Steel wetted parts; optional coatings available; sanitary configurations available. |
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Outputs
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2-wire loop-powered output. |
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Certifications |
Hazardous area approvals available (UL, FM, ATEX). |
Have a look at the flyer to get all the tech specs and product features.
Brochure
Read the manual for detailed information and instructions.
Manual
Check out a sample cert from our calibration lab.
Certificate
If you have a question that we have not covered then just get in touch and we’ll be happy to help.
We have tried to answer the most common questions we are asked here.
The Sonac 220 uses an ultrasonic sensor that sends a high-frequency sound wave across a small gap or down a probe tip. When the liquid level covers the sensor, the sound wave is dampened or reflected differently, which the solid-state electronics detect to instantly trigger the alarm. This non-mechanical operation prevents issues like sticking or clogging.
Yes. A key advantage of the ultrasonic technology used in the Sonac 220 is its immunity to viscosity, foam, and turbulence. Unlike devices that rely on mechanical movement or conductivity, the ultrasonic signal reliably detects the presence or absence of the liquid, even in challenging conditions.
The two-wire, loop-powered output simplifies wiring and reduces installation costs. The device draws its operating power directly from the same two wires used to transmit the alarm signal back to the control system, eliminating the need for a separate power supply cable.