Cognesense - Measure, Monitor, Protect

Sonac 220

The Sonac 220 Ultrasonic Level Switch is designed for terminal operators, plant engineers, maintenance teams, and EPC specifiers who require dependable level monitoring in harsh or hazardous environments.

This two-wire ultrasonic switch provides reliable high- or low-level detection in liquids and slurries.

Unlike mechanical floats or tuning fork switches that rely on moving parts, the Sonac 220 uses advanced ultrasonic technology with solid-state electronics. With no moving components, the switch eliminates mechanical wear, reduces maintenance downtime, and provides long-term reliability and safety in demanding storage and process applications.

Sonac 220 Ultrasonic Level Switch

Applications

Petroleum and Petrochemical: Used for high- and low-level alarms in crude oil, fuel, and chemical storage tanks.
Wastewater Treatment: Reliable monitoring of sludge, foam, and mixed liquor without fouling issues.
Chemical Processing: Ideal for aggressive, corrosive, or viscous products where mechanical switches may fail.
General Industrial Applications: Used for overflow protection, pump protection, and leak detection in utility tanks and process vessels.

Technical Specifications

Parameter

Description

Technology

Ultrasonic level switch, two-wire solid-state

Operation

Configurable for high-level or low-level detection (fail-safe selectable)

Accuracy

Reliable switching independent of foam, turbulence, or viscosity

Temperature Range

–40 °F to +185 °F (–40 °C to +85 °C)

Pressure Rating

Up to 150 PSIG (10 bar)

Materials of Construction

Stainless steel wetted parts; optional coatings and sanitary configurations available

Outputs

Two-wire loop-powered output

Certifications

Hazardous area approvals available including UL, FM, and ATEX

2026 COST ESTIMATE

Support

If you have questions not covered here, please contact the Cognesense support team for assistance.

How does the Sonac 220 operate without moving parts?

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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.

Can this switch be used with highly viscous or foamy products?

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.

What are the benefits of the two-wire loop-powered design?

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.