Radar Level Sensor

What is a Radar Level Sensor

A radar level sensor is a non contact level measurement instrument that uses microwave signals to determine the distance between the sensor and the surface of a liquid, solid, or slurry inside a tank or vessel. The sensor emits short microwave pulses toward the material surface. These pulses reflect back to the sensor, and the time of flight of the signal is used to calculate the exact level with high accuracy and repeatability.

Because radar level sensors operate on microwave technology, their measurement performance is unaffected by process temperature, pressure, vapour, dust, foam, or changes in the physical properties of the measured media such as density, viscosity, or conductivity. This makes the radar level sensor one of the most versatile and reliable level measurement technologies available for industrial process applications.

Types of Radar Level Sensors Available at TTS

TTS stocks the full VEGA VEGAPULS radar level sensor range, covering applications from simple storage tank monitoring to complex process vessels in hazardous environments. The available sensor types are:

80 GHz High Frequency Radar Level Sensors

VEGA VEGAPULS sensors operating at 80 GHz produce a narrow, focused microwave beam that delivers superior signal quality in challenging vessel geometries, tanks with internal obstructions, narrow bypass chambers, and vessels with agitators or heating coils. The narrow beam angle minimises interference from tank walls and internal fittings. The VEGAPULS 6X is the flagship 80 GHz radar level sensor in the VEGA range, covering measurement ranges up to 120 metres in liquids and bulk solids with a single instrument platform.

Compact and Cost-Effective Radar Level Sensors

The VEGAPULS C series and VEGAPULS Air series radar level sensors are designed for straightforward level measurement applications in standard process conditions. These compact units offer non contact radar level measurement at a lower instrument cost, making them appropriate for storage tanks, buffer vessels, water treatment applications, and general utility level monitoring where the full specification of a high-end process radar sensor is not required.

Process Radar Level Sensors for Challenging Environments

The VEGAPULS 60 series radar level sensors are designed for demanding process conditions including high temperature, high pressure, aggressive chemical media, and applications involving heavy vapour, steam, or condensation. These sensors carry ATEX and IECEx hazardous area certification and are available with a range of antenna and process connection options to match specific vessel and process requirements.

When to Specify a Radar Level Sensor Over Other Level Measurement Technologies

A radar level sensor is the technically correct selection over ultrasonic, float-based, or guided wave radar instruments when the following process conditions apply:

• The process media is corrosive, sticky, or abrasive and would damage or coat a contact-based level probe or float element
• The vessel contains foam, heavy vapour, steam, or condensation that degrades ultrasonic sensor signal quality and produces unreliable level readings
• The measurement range exceeds what ultrasonic technology can reliably cover, particularly in large storage tanks or silos
• The process media density, viscosity, or dielectric constant varies between batches or operating conditions and would affect the calibration of contact-based instruments
• The installation requires long-term maintenance-free operation with no wetted parts to inspect, clean, or replace during planned shutdowns
• The application involves bulk solids, powders, or granular materials where a guided wave radar probe stem would be buried or damaged by the material
• Hazardous area certification is required and a non contact measurement method reduces the number of process penetrations needed on the vessel

What is a non contact radar level sensor?

A non contact radar level sensor measures the level of liquids, bulk solids, or slurries by emitting microwave signals toward the material surface without any physical contact with the process media. The signal reflects off the surface and returns to the sensor, where the time of flight is used to calculate the exact level. Because the sensor never touches the process media, a non contact radar level sensor is suitable for corrosive, high-temperature, high-pressure, and hygienic applications where contact-based instruments are not practical.

Non Contact Radar Level Measurement: Key Process Advantages

All VEGAPULS radar level sensors on this page operate on the principle of non contact radar level measurement, meaning the sensor antenna never physically touches the process media inside the vessel. This single characteristic delivers several operational advantages that directly affect instrument reliability, maintenance cost, and process uptime:

• No wetted moving parts: Eliminates mechanical wear, seal degradation, and float fouling that affect contact-based level instruments over time
• No process media dependency: Radar level sensor accuracy is not affected by changes in liquid density, viscosity, conductivity, or colour, unlike guided wave radar in certain low-dielectric media or ultrasonic in variable temperature environments
• No contamination risk: The sensor does not introduce any foreign element into the process vessel, making it suitable for hygienic, pharmaceutical, and food-grade applications
• Minimal maintenance requirement: With no wetted parts to inspect or replace, radar level sensors operate reliably for years in continuous service without scheduled maintenance intervention
• Wide process compatibility: A single radar level sensor model can often be applied across liquids, slurries, and bulk solids, reducing the number of instrument types required across a plant

Radar Level Sensor vs Ultrasonic Level Sensor

Both radar and ultrasonic level sensors offer non contact level measurement, but their operating principles produce significantly different performance characteristics in industrial process conditions:

• Signal medium: Ultrasonic sensors transmit sound waves through air, making signal velocity sensitive to temperature gradients and air composition. Radar level sensors transmit microwave signals that are unaffected by air temperature, vapour pressure, or gas composition above the liquid surface.
• Foam and vapour performance: Ultrasonic signals are absorbed or scattered by foam layers and heavy vapour, producing lost signal or false readings. Radar microwave signals penetrate foam and vapour in most standard process conditions and maintain reliable contact with the true liquid surface.
• Temperature range: Ultrasonic sensor performance degrades at elevated temperatures due to changes in sound velocity. Radar level sensors maintain consistent accuracy across a wide temperature range without requiring temperature compensation.
• Measurement range: Radar level sensors cover significantly longer measurement ranges than ultrasonic, with high-frequency models such as the VEGAPULS 6X measuring up to 120 metres.
• Dust and particulate environments: In silos and hoppers containing dusty bulk solids, radar microwave signals are not attenuated by airborne dust. Ultrasonic sensors lose signal reliability in high-dust environments.

For standard open-air water or wastewater applications with no vapour, foam, or extreme temperature, ultrasonic level sensors remain a cost-effective option. For all other process conditions, a radar level sensor delivers more reliable and accurate non contact radar level measurement.

VEGA VEGAPULS Radar Level Sensors: Why TTS Stocks This Range

VEGA is one of the leading manufacturers of radar level sensors globally, with over 30 years of radar level measurement development. The VEGAPULS product range covers the full spectrum of industrial level measurement requirements from compact general-purpose sensors to high-specification process instruments rated for extreme conditions. VEGA radar sensors are manufactured in Germany and carry internationally recognised hazardous area approvals including ATEX, IECEx, FM, and CSA.

TTS stocks VEGA VEGAPULS radar level sensors because they represent proven, field-tested technology with a consistent record of reliable performance in demanding applications across oil and gas, chemical processing, water treatment, food and beverage, pharmaceutical, and power generation industries. Our inventory covers the most commonly specified VEGAPULS models, allowing us to support both planned procurement and urgent replacement requirements with fast dispatch.

Industries Using Radar Level Sensors

VEGAPULS radar level sensors supplied by TTS are deployed across the following industries where non contact radar level measurement is the standard or preferred technology:

• Oil and Gas: Crude oil storage tanks, separator vessels, condensate receivers, produced water tanks, and offshore platform process vessels
• Chemical Processing: Acid storage, solvent tanks, reactor vessels, and chemical dosing tanks where corrosive media disqualifies contact-based instruments
• Water and Wastewater Treatment: Clarifiers, sludge tanks, chemical dosing vessels, and clean water storage reservoirs
• Food and Beverage: Hygienic storage tanks, ingredient silos, and process vessels requiring CIP-compatible non contact level measurement
• Pharmaceutical: Purified water tanks, solvent storage, and process reactors requiring contamination-free level measurement
• Power Generation: Fuel oil storage, condensate tanks, cooling water systems, and ash silo level monitoring
• Cement and Bulk Solids: Cement silos, clinker hoppers, and raw material storage where dust-filled atmospheres make ultrasonic measurement impractical

Frequently Asked Questions

What is the difference between a radar level sensor and a guided wave radar level sensor?

A radar level sensor is a non contact instrument where the microwave signal travels through open air space from the antenna to the material surface. A guided wave radar level sensor uses a probe rod or cable inserted into the process media to guide the microwave signal directly to the liquid surface. Non contact radar level sensors are preferred when probe insertion is not practical due to media properties, vessel geometry, or maintenance access constraints. Guided wave radar is preferred for applications with low dielectric media, turbulent surfaces, or installations requiring measurement very close to the vessel wall.

Can a radar level sensor measure bulk solids and powders?

Yes. Radar level sensors are widely used for bulk solid level measurement in silos, hoppers, and storage bins. High-frequency 80 GHz radar level sensors such as the VEGAPULS 6X are particularly effective for bulk solid applications due to their narrow beam angle, which reduces wall interference and signal scattering from uneven solid surfaces. The sensor selection for bulk solid applications must account for the dust concentration inside the vessel and the reflectivity of the specific material being measured.

Do radar level sensors require calibration after installation?

VEGA VEGAPULS radar level sensors require a basic setup on installation to define the empty distance (tank height) and the span (measurement range), which is typically completed using the sensor display or a handheld HART communicator. After initial setup, radar level sensors maintain their measurement accuracy without regular recalibration, as there are no drift-prone mechanical or resistive elements in the signal path. Periodic functional verification is recommended for safety-critical or custody transfer applications as part of the site maintenance schedule.

Are VEGAPULS radar level sensors suitable for hazardous area installations?

Yes. VEGA VEGAPULS radar level sensors are available with ATEX, IECEx, FM, and CSA hazardous area certifications covering Zone 0, Zone 1, Zone 2, Division 1, and Division 2 classified locations. The specific certification required depends on the area classification and the applicable regional standard for the installation site. TTS can confirm the correct certified model for your hazardous area classification before purchase.

What output signal do VEGA radar level sensors provide?

VEGA VEGAPULS radar level sensors are available with 4-20 mA two-wire loop-powered output, 4-20 mA with HART protocol for digital communication and diagnostics, Foundation Fieldbus, and Profibus PA for fully digital field instrument architectures. The correct output selection depends on the control system input card type and the site field instrument communication standard. TTS can confirm output compatibility with your control system before order placement.

Request a Quote for VEGA Radar Level Sensors

TTS maintains stock of the most commonly specified VEGAPULS radar level sensor models and can provide competitive pricing on factory new units with fast delivery. For application-specific selection support, our instrumentation team can recommend the correct VEGAPULS model based on your process conditions, vessel geometry, media properties, and output signal requirements.

Submit an RFQ with your application details and receive a response from TTS within one business day. You can also reach our team directly at +1-888-964-8837 or email sales@transmittershop.com.