Introduction to Radar Level Measurement

The efficient operation of process plants relies on accurate and reliable level measurement instruments. These measurements are important for optimizing process control, inventory management, and custody transfer, all of which can affect profitability. Level measurement also plays a critical role in safety applications such as overfill prevention. Radar level meter systems are available in contacting and non-contacting versions.


Contacting:

Contacting is generally a good fit for small spaces and is an easy replacement of older technology such as displacers and capacitance probes. Contacting devices, called guided-wave radar (GWR), are slightly more prevalent primarily because they are capable of providing interface level instrument (e.g. oil and water), as well as standard direct level measurements.

Guided wave radar measurement is based on the time difference between sending and receiving a microwave pulse sent down a probe and reflected back to the media surface.

For level and interface measurement of liquids or solids

Suitable for wide range of temperature and pressure requirements

Unaffected by media density, viscosity, conductivity, turbulence, foam, and dust

Get highly accurate and reliable direct level and interface measurements

Solve challenges of small vessels, difficult tank geometries, and internal obstructions

Ideal for chamber applications and for replacing older technologies


Handle most liquid storage and monitoring applications with ease

Smart, loop-powered guided wave radar technology

High reliability and performance

Ideal solution for your new or remote measurements with no wiring and easy commissioning

Built on proven technologies ensuring reliable performance and high accuracy

Minimal maintenance and long-lasting nine-year battery life


Non-contacting:

Non-contacting is generally a better fit for dirty, viscous and/or corrosive applications and when agitators are present. Non-contacting radar transmitters perform level measuring instruments by using frequency modulated continuous wave (FMCW) technology. Rosemount's unique energy-efficient two-wire FMCW radar level sensor technology provides optimal performance.

A microwave signal launched into the tank is reflected back from the media surface. The level is derived from the time or frequency difference between the sending and receiving of the signal.

For liquid or solid tank levels with wide range of temperature and pressure requirements

Top mounted; can be isolated by valves

Unaffected by media density, viscosity, dirty coatings, and corrosiveness

MultiVariable output with level, distance, volume and/or signal strength

Immune to changing density, conductivity, temperature, pressure, viscosity and pH

Compatible with a wide selection of materials, process connections, antenna styles and accessories

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