When you have a question about process automation that needs a short answer, let us know with #WishIknew and #Visaya! We’ll reply with a #WishIknew post. It’ll give a quick explanation, then some related articles, videos, or reviews if you want to know more.

I wish I knew what the best level measurement principle is!

A few months ago, I read an article on flow meters where the author wisely concluded by saying there is no best level measurement principle for flow meters. I completely agree. One flow meter or level meter or whatever can’t cover all conditions! Same goes for brands; some have more features than others, but you may not need those features.

We can discuss pros and cons, but your process data dictate what device will give you the accuracy or lifespan or stability you need. However, I can give you the relevant points about the most common level devices on the market. Beyond that, you can find more content on Visaya that explains each in detail.

  • Differential pressure transmitter: Classic but limited in unstable densities and has mechanical structure in most applications
  • Free space radar: Non-contact and requires a minimum dielectric value
  • Guided wave radar: Makes contact with the product, has specific installation requirements but can install in low dielectric values
  • Capacitance level transmitter: Needs two capacitor plates (either the vessel wall or another probe), makes contact with the product, and limited media

List of the non-contact level transmitter on the Visaya eShop:


These articles will tell you more about those level measurement principles:

Non-contact radar level transmitters and their frequency bands! – Hey, all right? Today we’re learning more about non-contact radar level transmitters, also known as free space radars. Yep, same device, just a different name. And you’ll find that they have various frequency options as well. Which should you choose? Let’s learn a little more!

Guided wave radar and you! – Here we are again to chat some more about radar! Today, the star of the article is the guided wave radar. Do you know when you should apply a guided wave radar rather than a non-contact radar? If you don’t, then keep reading! If you do, then keep reading anyway. You might see something new or find something to argue about with me.

The definitive guide to time of flight (ToF) devices – Here we go again with another guide! If you haven’t read our definitive guide to pressure transmitters, then definitely check it out. This topic actually relates to what you learned in our previous guide. Time of flight (ToF) devices measure level, just like differential pressure (DP) transmitters. Of course, they do it in a different way, meaning new pros and cons.


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