Product Review: Yokogawa YTA320

This month, we had a ton of reviews on temperature devices, low-end and high-end both. Now you know the differences among these devices and can size up the brands with the features and accuracy that fit your needs.

Today, we have Yokogawa here at Visaya again! The YTA320 is a high-end field transmitter with dual channels, advanced diagnostics, and fancy features. Let’s see how it might fit in a new application and discuss its features. Enjoy!

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?

Yokogawa does a thing I don’t like with its portfolio where it has models based on field protocol and input. So the YTA310 has one input, the YTA320 has two, yadda yadda, you get the picture. Hope this company strategy works for y’all, because it doesn’t for me. Anyway, we’ll focus on the YTA320 because it has dual inputs and more protocols.


Yokogawa YTA320
Courtesy of Yokogawa

This device sports the Yokogawa green and the same housing design as several of Yokogawa’s other lines. And the housing has two parts; you can open the back, to connect sensors and loop power, and the front, to access the electronics and display.

The display offers process variables, alarms, warning messages, and bar graphs to show the measuring ranges. For housing materials, you can get low copper cast-aluminum alloy or stainless steel, and these options cover applications in many segments. But I didn’t see a hygienic version. If you know more, then please drop me a line!

Yokogawa YTA320
Courtesy of Yokogawa

You have three field protocols for integration: HART, BRAIN, and FOUNDATION Fieldbus. BRAIN is Yokogawa’s proprietary protocol that only sends its digital data on Yokogawa control systems and needs a Yokogawa handheld to set up! If you’re a big Yo fan, then you’ll do fine with this. If you want to use something else, like PROFIBUS PA, then back on the hunt you go!

What can it do?

The YTA320’s dual input can read thermocouples, resistance temperature detectors (RTDs), resistance, or voltage. It’s common to find temp devices using different sensors in the field, because resistance and voltage allow transmitters to read a wide range of sensors, and the YTA320 has this capacity too.

Yokogawa YTA320
Courtesy of Yokogawa

And now for something completely different – accuracy! As I mentioned in earlier articles, this depends on the sensors you choose. For instance, a type-K thermocouple with an input range from -50 to 400 degrees Celsius has a digital accuracy of +-0.14 degrees Celsius. Not bad, huh?

Voltage supports -10 to 100 millivolts, and resistance 0 to 2000 ohms. In the manual, you can see the entire list of sensors to find accuracy, measuring range, and other stuff.

Why should I care?

The YTA320 has good features, accuracy, and flexibility to fit common field sensors. Now, depending on your segment, it should have special approvals and protections to work in the field, right? Well, it brings a long list of approvals from the Canadian Standards Association (CSA), Factory Mutual (FM), IECEX, and more. You can read the full list here. And on the protection side, the device has IP66, IP67, and NEMA4X ratings.

As for fancy features, it doesn’t have anything beyond what other brands have, but hey, at least it has those, right? First, you can do a differential or average of your measurements using both sensors. Second, it has a backup function where a sensor failure will make the transmitter switch to the other sensor and send you a diagnostic.


The YTA320 has the option to read two sensors at the same time, which provides a variety of benefits. It also has advanced functions and diagnostics that can help sustain process measurement in your application. If this sounds good to you, then scale it out!

I looked for a related Yokogawa video but didn’t find one, so have a Visaya video on temperature measurement instead:

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