Ultrasonic Level Sensor

Ultrasonic level sensors provide a reliable and maintenance-free way to measure liquid and solid levels without direct contact with the process medium. Using sound wave reflection technology, they determine the distance between the sensor and material surface with exceptional accuracy even in challenging environments.

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How Ultrasonic Level Sensors Work

Ultrasonic sensors operate by emitting high-frequency sound waves toward the surface of the material being measured. The sensor calculates level based on the time it takes for the echo to return after hitting the surface.

Because measurement depends on time-of-flight rather than electrical or mechanical properties, ultrasonic level sensors provide stable readings regardless of medium composition, conductivity, or density.

As a non contact ultrasonic level sensor, the instrument never physically touches the process media, making it suitable for corrosive, hygienic, and general-purpose liquid level applications. This non-contact principle makes them ideal for liquids, slurries, and light bulk solids, offering a perfect balance of precision and simplicity for a wide range of industrial applications.

Performance and Technical Highlights

Each ultrasonic level sensor offered by TTS is designed for consistent accuracy, robust signal processing, and durability in demanding conditions.

Model-Dependent Specifications:
• Measurement Range: Up to 15 m (VEGASON 61/ VEGASON 62 models)
• Accuracy: ±5 mm or 0.2% of range
• Output Signals: 4–20 mA, HART, or Modbus communication
• Temperature Range: –20°C to +80°C
• Mounting Options: Threaded, flanged, or bracket installation
• Construction: Durable plastic or stainless-steel housing with corrosion protection
• Protection Rating: IP66/IP68 for harsh outdoor environments

With features like integrated temperature compensation and echo suppression, these sensors maintain reliable performance even when faced with process turbulence, foam, or buildup.

Where Ultrasonic Sensors Make the Difference

Ultrasonic level sensors stand out where reliability, cleanliness, and simplicity matter most.
They’re designed to overcome the very challenges that limit other level measurement technologies ensuring stable readings and minimal maintenance.

They excel in situations such as:
• Aerated or Foamy Liquids: Smart echo processing ensures accurate results despite surface turbulence.
• Aggressive or Corrosive Media: Non-contact sensing eliminates exposure-related damage.
• Hygienic and Sanitary Systems: Ideal for clean-in-place environments in food and beverage production.
• Remote and Outdoor Applications: Weatherproof construction ensures long-term stability in open tanks and reservoirs.
• Variable Media Conditions: Consistent accuracy across liquids, slurries, and light solids.

This versatility makes ultrasonic sensors a preferred choice for continuous, low-maintenance level measurement across both process and environmental industries.

With expert configuration support, fast availability, and access to globally recognized sensor technology, TTS ensures your level measurement solution performs accurately from setup to operation.

Ultrasonic Liquid Level Measurement: Application Suitability

Ultrasonic liquid level measurement performs reliably in open tanks, sumps, reservoirs, and standard process vessels where the air space above the liquid is free from heavy vapour, steam, or dense dust. It is the preferred non-contact selection for water and wastewater applications, chemical storage tanks with mild media, food-grade liquid vessels, and environmental monitoring installations where simplicity, low maintenance, and cost-effectiveness are the primary selection drivers.

Ultrasonic liquid level measurement is not recommended where heavy steam, condensation, or vapour blankets form above the liquid surface, as these conditions attenuate the sound signal before it reaches the liquid surface and produce unreliable readings. For such process conditions, radar level sensors are the appropriate alternative.

Industries Using Ultrasonic Level Sensors

  • Water and Wastewater Treatment: Reservoir monitoring, sump level control, pump station automation, and open channel flow measurement
  • Food and Beverage: Hygienic storage tank level monitoring where non-contact sensing prevents liquid contamination
  • Chemical Processing: Corrosive liquid storage tanks where non-contact measurement eliminates chemical attack on wetted sensor components
  • Pharmaceutical: Purified water and solvent storage vessels requiring contamination-free level detection
  • Environmental Monitoring: Rivers, canals, and outdoor reservoirs where IP66/IP68 rated ultrasonic sensors operate reliably in all weather conditions
  • Oil and Gas: Utility water tanks and non-critical liquid storage where ultrasonic liquid level measurement provides reliable performance at lower instrument cost

Frequently Asked Questions (FAQ's)

What is an ultrasonic level sensor used for?

It measures the level of liquids or solids by sending ultrasonic waves and calculating the echo time for accurate, non-contact level monitoring.

Can ultrasonic level sensors measure solids as well as liquids?

Yes, they can measure bulk solids like grains, powders, and pellets, provided the surface reflects ultrasonic waves effectively.

How do ultrasonic level sensors handle foam or vapor?

VEGASON sensors use intelligent signal processing and echo suppression to provide stable readings even with foam or vapor presence.

Are ultrasonic sensors affected by temperature?

Integrated temperature compensation ensures consistent accuracy despite temperature variations.

What is ultrasonic liquid level measurement?

Ultrasonic liquid level measurement is a non-contact method that uses high-frequency sound pulses to determine the distance between the sensor and the liquid surface inside a tank or vessel. The sensor emits a pulse, measures the time taken for the echo to return from the liquid surface, and converts this into a continuous level reading output as a 4-20 mA signal. Because the sensor does not contact the liquid, it is suitable for corrosive, hygienic, and general-purpose liquid level applications across industrial and environmental installations.

When should I choose ultrasonic liquid level measurement over radar?

Ultrasonic liquid level measurement is the correct selection for standard open-tank liquid applications without heavy vapour, steam, or extreme temperature conditions particularly where instrument cost is a key factor. Radar is the preferred selection when the process involves heavy vapour, foam, high pressure, extreme temperature, or measurement ranges beyond what ultrasonic technology can reliably cover.