Radar level sensors – find manufacturers and suppliers

Radar level sensors are used for continuous and non-contact level measurement of liquids, solids or bulk materials.

They work with high-frequency electromagnetic waves that are reflected by the material surface and evaluated by a receiver. This technology is used in numerous industrial sectors such as chemicals, food, water and waste water management as well as in energy generation.

Below you will find how radar level sensors work, how they are used and an overview of their advantages:

How radar level sensors work:

Radar level sensors are based on the time-of-flight measurement of electromagnetic waves. There are two main technologies:

Time-of-flight (ToF)

1. A radar pulse is emitted and hits the surface of the measured medium.
2. The reflected wave is received back to the sensor.
3. The transit time of the signal is recorded and converted into a level.

Frequency modulated continuous wave (FMCW):

1. The sensor transmits a continuous signal with a linearly increasing frequency.
2. The reflected wave has a frequency shift (Doppler effect).
3. The frequency difference between the transmitted and received signal is measured to calculate the distance to the medium.

Typical applications of radar level sensors:

1. Chemical and pharmaceutical industry:
Measurement of aggressive liquids in reactors or storage tanks.

2. Food industry:
Hygiene-compliant level measurement in tanks and silos.

3. Water and waste water technology:
monitoring of levels in sewage treatment plants or reservoirs.

4. Power generation:
Monitoring of bulk material levels in coal or biomass plants.

5. Oil and gas industry:
Measurement of fuels and chemicals in tanks.

Advantages of radar level sensors:

• No direct contact with the medium, ideal for aggressive or hygienically critical applications.
• Precise measured values regardless of temperature, pressure or medium properties.
• Versatile use for liquids, bulk solids and chemical substances.
• No moving parts, therefore durable and reliable.
• Also works with dust, steam, foam or temperature fluctuations.

Radar level sensors offer a reliable, precise and low-maintenance solution for level measurement in a wide range of industries. Thanks to the non-contact measuring method, they are particularly indispensable in demanding environments. The choice of the right sensor depends on the specific requirements of the application.

Here are the most important aspects to look out for when purchasing radar level sensors:

Purchasing radar level sensors requires a precise analysis of the technical requirements, environmental conditions and economic factors.

• Before making a purchase decision, the technical requirements for level measurement must be analyzed in detail.
• Radar level sensors operate at different frequencies, which vary depending on the application:
• 6 GHz: Suitable for bulk materials with coarse surfaces.
• 26 GHz: Standard for liquids and many bulk materials.
• 80 GHz: Particularly precise measurement for small containers and demanding conditions.
• 80 GHz sensors are often the best choice for high-precision measurements in narrow tanks or with low-reflective media.
• The range typically extends from a few centimetres to 100 meters.
• High-quality sensors achieve an accuracy in the millimeter range.
• The process conditions (pressure and temperature) must be taken into account:
• High temperature resistant sensors are required for applications in hot media (> 200 °C).
• High-pressure sensors are required for processes with pressures above 10 bar.
• check whether the housing material and antenna technology are suitable for aggressive or extreme conditions.
• Dusty, foaming or vaporous environments can influence the measurement signal.
• Low values of the dielectric constant of the medium can lead to weaker reflections (e.g. with oils).
• For difficult measuring conditions, select sensors with focused signal routing or specially optimized software.
• The process connections and mounting, such as flange, thread or compression fitting, depend on the tank design.
• Parabolic, horn or rod antennas should be selected depending on the reflection properties of the medium.
• Note whether the sensor needs to be retrofitted into an existing system.
• Which communication interfaces are supported by the sensors?
• Analog (4-20 mA): Standard for many industrial applications.
• Digital (HART, PROFIBUS, Modbus, Ethernet/IP): For intelligent control systems.
• Wireless technology: For mobile or difficult-to-access applications.
• Sensors with a digital interface facilitate remote monitoring and process automation.
• Note whether the sensor needs to be retrofitted into an existing system.
• In addition to the purchase price, long-term costs should be taken into account:
• The maintenance effort: (Radar is usually maintenance-free). Energy consumption.
• Higher-quality sensors with a longer service life are often more economical than cheaper models with frequent failures.
• Check availability with the manufacturer or dealer at an early stage.
• Observe the manufacturer's certifications and quality standards:
• Depending on the industry, special requirements may apply:
• ATEX/IECEx for potentially explosive atmospheres.
• FDA/EHEDG for the food and pharmaceutical industries.
• SIL certification for safety-critical applications.
• Pay attention to the technical support. Training and spare parts availability are crucial.

The purchase of a radar level sensor should not only be based on price, but also on technical requirements, environmental conditions and long-term costs. Careful selection guarantees reliable and efficient level measurement.

Radar level sensors can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Radar level sensors from all over the world can be found on Exportpages.