Radar or pressure transmitter?

Level Pressure Q&A

Nowadays, I see a lot of recommendations to use radar for level measurement. Would it benefit me to switch from a pressure transmitter to a radar level meter?

Expert’s answer: Radar or pressure transmitter?

So, the question is whether you should choose a radar or pressure transmitter? And the answer is: Maybe, but maybe not. So, let’s find out…

Some process applications have conditions where a pressure transmitter will work better than a radar. And we need to keep in mind most advantages and limitations apply only to certain applications.

Usually, the companies that promote radar point to the fact that pressure
transmitters don’t measure directly. And that’s true! A pressure transmitter derives its level measurement from the relation of height and density. So, if your product has density changes, a pressure transmitter won’t provide good level measurements. That is unless you accurately factor in the variations.

Radar or pressure transmitter
Level transmitter – Copyright Endress+Hauser

Also, when you have a pressure transmitter using capillary, the temperature can affect the measurement. Plus, an incorrect installation can decrease the accuracy.

Emerson Pressure
Wireless Solutions – Copyright Emerson Automation Solutions

On the other hand, the radar meter measures the level directly without density influence. But, it has a much more complex setup. It also depends on the dielectric constant to work. Therefore, choose according to your application instead of recommendations. You know your situation and needs best.

DP pressure transmitters on the market:

Radars on the market:

Other resources that might interest you

Pressure transmitter basics
What are the different types of pressure sensors available in the market?

Offset and slope for differential pressure transmitter?
I have to install and calibrate a Rosemount differential pressure transmitter. So, how do I do the offset and slope adjustment?

Wireless radar
I have a new level measurement application. But the vendor wants to sell me wireless stuff with the radar. So, what kind of concerns should I have?

Related tags: Differential of pressure DP level level application Level device level measurement limitation Pressure transmitter Radar radars
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