Radar or pressure: Which is the best level principle?

Level Q&A

Hi, Could you explain what is the best level principle? Is it better for me to implement a radar rather than a pressure transmitter for level measurement?

Expert’s answer: Which is the best level principle – radar or pressure?

Whether you should opt for radar or pressure depends on your application. In short, the radar offers a wide range of benefits in comparison with a pressure transmitter. But on the negative side, the price for a radar can sometimes be higher than a pressure transmitter.

For the last decade, the pressure transmitter was the standard solution to solve measurement application issues. That’s why nowadays, it’s common that the pressure transmitter is the first solution that pops into your mind. But what you should know is that you can find a better solution on the market.

Radar or pressure
Courtesy of Endress+Hauser

The problem with using a pressure transmitter to a level application is that product can’t be measured with an unstable density. As you might know, the calculation of the level is basically height x density. If you have unconstant density, you’re goning to have a problem with the level measurement.

Second, the mechanical installation, capillary, seal pot and more are factors that increase the error in your level measurement. However, you have a new type of pressure transmitter with electronic sensors to avoid this sort of problems with installations.

Radar or pressure
Courtesy of Emerson Automation Solutions

The radar brings more benefits, because the installation is in most cases simplified in comparison with a pressure transmitter. For example, the density, foam and vapor aren’t a problem when the radar measures the level. Most of the applications will work with a simple basic setup. But if you have an application where you need more details in the setting up, the radar is complicated compared to setting up a pressure transmitter.

My advice is to check the accuracy and all the efforts necessary to install both technologies to decide the solution that is the best for your application.

Both options have pros and cons!

Want to learn more? Below you have a list of radars on the market:

This is a list of DP pressure transmitter:

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