Product Review: KROHNE OPTIWAVE 7300 C

Hey, let’s continue our journey through the level devices! Not all applications are simple, you know. High temperature, foam, tank design, and other things can create big challenges in level measurement. Some companies tackle these challenges with radar.

Radar transmitters have gained ground in level applications, even nudging differential pressure transmitters from the top spot in some areas. However, some places resist change, even beneficial change.

I once worked on a level measurement project for a food company that wanted to test radar and wireless communication. To show that radar can work in a tank with a stirrer if the dielectric constant could support it, we tested both the wireless communication and the radar device over a week. Both technologies passed with flying colors.

However, the customer had a bias against the radar because the rest of the plant ran with differential pressure transmitters. Long story short, the customer chose to stick with the old solution, even with the need to build the cable structure for it and the density problem because of the pressure principle.

Courtesy of Giphy

This experience shows that people avoid unfamiliar tech, even if it proves useful. We need to break barriers to push these devices in processes where they supply more benefits. Of course, some devices and solutions need certifying, but engineers should keep their minds open to these ideas.

Okay, rant over! On to the review. Say hello to the OPTIWAVE 7300 C from KROHNE! We’ll check the features and possibilities with this transmitter and how you can improve your level measurement thinking.

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Back to the review! Take a seat, grab a cola, have a read, and draw your conclusions!

Disclaimer: This product review examines only features, not performance. If you’ve used this device, feel free to share your experience in the comments.

Whatcha got there?

KROHNE offers some good flexibility with the OPTIWAVE 7300 C. You can use it to measure ranges up to 80 meters. Although it defaults to liquid, you can use it in pastes and slurry products too. As a loop-powered device, it gets its power and communication through the same pair of cables, with a K-band between 24 and 26 GH. At least that’s what the manual says.

It also has plenty of antenna options to cover various signal distances and beam angles. I found the graphic for the antenna distance weirdly hard to read, but you can find your answer if you have your product’s dielectric constant and tank diameter. On the other hand, the beam angle gave me less trouble. For example, if you choose a DN40 horn, you get a beam angle of 20 degrees. Then, if you need a DN80 antenna drop, you get an angle of 8 degrees.

Kourtesy of Krohne

Furthermore, you can use the OPTIWAVE 7300 C in a process connection from -50 to 150 degrees Celsius. The special option gives you -50 to 200 degrees Celsius, if you need that kind of range. As for pressure, you can get from -1 to 16 bar or -1 to 40 bars, depend on the type of antenna you choose.

What can it do?

Well, it does a good job of measuring the difference between the emitted signal and the received signal. Of course, the secondary values mean more to you, right? The OPTIWAVE 7300 C will provide level, volume, distance, mass, and more. Good, right?

You also need chemical compatibility between the wetted part of the radar and your process product. The OPTIWAVE 7300 C comes in materials like stainless steel, Hastelloy C-22, or PEEK for hygienic applications. Even the gaskets come in different materials, so you have plenty of ways to fit this device into your process.

Kourtesy of Krohne

Most of the time, you install the radar on top of the vessel to avoid waiting for a scheduled downtime. Maybe you have a way around this problem, but since it comes up a lot in these applications, the OPTIWAVE 7300 C also has different process connections to suit your needs.

Why should I care?

Because it addresses the integration issue fairly well, and that issue alone may tip the scales between two vendors. When it comes to protocols, the OPTIWAVE 7300 C has HART, Foundation Fieldbus, and PROFIBUS PA. These common protocols will probably fit your process easily.

You can also have up to two analog outputs to directly connect to your control system. You can set up the output through the local display or a handheld. Best of all, the display navigation doesn’t require a technical manual in your other hand.

Kourtesy of Krohne

It also has a step-by-step guide for a quick setup. Of course, your application may need advanced configuration and analysis. You can check the reflection graph to do a deep analysis to clear signal interference or measure tanks with curved or conical bottoms.

So there you have it, the OPTIWAVE 7300 C from KROHNE! Check it out and see if it suits your process.

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