Expert’s answer: Radar level measurement

So you’re wondering how radar level measurement works? We can certainly explain this. Radar level meters work based on the time of flight (TOF) method or time domain reflectometry (TDR). To start with, you measure the distance from the reference point to the surface of your liquid. Then the meter sends a high-frequency signal from an antenna or along a probe.

Radar level measurement 5300
Radar – Courtesy of Emerson Automation Solutions

When the product surface reflects the pulse, the meter receives the reflection. Then the device calculates how long it took the pulse to return and translates that time delay into level measurement.

Before you apply a radar meter, you need to know the dielectric constant (DC) of your product, as that has a direct impact on the quality of the reflections. Product with high DC values will reflect strong, clear pulses.

On the other hand, a product with a low DC value will absorb more of the pulse, reflecting less and reducing accurate readings.


Where can you get more information about radar level measurement?

If you want more information on how radar level measurement works or want to find the right radar for you, we’ve collected some links for you below.

Radars on the market:

Other resources that might interest you

Wireless radar
What do you need to know about wireless applications with the radar for a level measurement application?

Radar buildup
How do you avoid buildup in your radar antennas?

Basic radar setup
What’s the best configuration for a new level radar?


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