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Sonac 220

Ultrasonic Level Switch

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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
Sonac 220 Ultrasonic Level Switch
SONAC 220

Features

Solid-State Ultrasonics

Provides non-intrusive level detection without moving parts, ensuring consistent switching performance even when products foam, coat, or rapidly change density.

Drift-Free Measurement

Acoustic feedback sensing eliminates mechanical wear and calibration drift, maintaining dependable actuation accuracy throughout changing temperature, viscosity, or turbulence conditions.

Fail-Safe Protection

Selectable high- or low-level fail-safe modes ensure safe alarm behavior during power loss, wiring faults, or unexpected signal failures in hazardous applications.

Built-In Self-Test

Internal diagnostic circuitry verifies sensor and relay operation on demand, enabling quick functional checks during startup or routine field maintenance.

Dual Time Delays

Independent make and break delays minimize false trips caused by splashing, falling material, or flow variations, improving reliability in dynamic process environments.

Hazardous-Area Compliance

Available UL, FM, and ATEX approvals ensure safe installation in explosive atmospheres, supporting global deployment across petrochemical and industrial facilities.

Applications

  • Petroleum Storage: Provides reliable high/low point detection in crude, fuels, and chemical tanks where mechanical switches may foul or fail under harsh conditions.
  • Wastewater Basins: Delivers consistent level alarms in sludge, mixed liquor, and aerated basins, remaining unaffected by foam, turbulence, or solid carryover.
  • Chemical Vessels: Handles corrosive, viscous, or aggressive liquids using sealed ultrasonic sensing, maintaining alarm accuracy where mechanical devices cannot operate reliably.
  • Food & Beverage: Supports hygienic processes with non-intrusive sensing, enabling dependable point-level control in sanitary tanks and pipelines with fast-changing products.
  • Bulk Solids Handling: Detects light or stringy solids such as plastics, fibers, and powders, enabling high/low level alarms or plugged-chute monitoring.
  • Pump Protection: Provides dry-run or overfill indication for centrifugal and transfer pumps, preventing equipment damage and reducing downtime during abnormal operating conditions.
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Specifications

Technology

Ultrasonic level switch, two-wire solid-state

Operation

Configurable for high-level or low-level detection

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 available

Outputs

2-wire loop-powered output; fail-safe selectable

Connections

Threaded or flanged process connections

Certifications

Hazardous area approvals available (UL, FM, ATEX for EU)

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

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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?

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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?

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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.

Summary

With over a century of tank safety and measurement expertise, Cognesense delivers proven reliability across critical industries. The Sonac 220 Ultrasonic Level Switch combines solid-state sensing, rugged design, and global certifications to provide safe, low-maintenance, and cost-effective level monitoring. By choosing Cognesense, you gain more than a switch — you gain trusted engineering and long-term protection for your people, product, and facilities.

L&J
Measure.
Monitor.
Protect.