ABB TSP300-W vs Rosemount 648

Guess who’s back? Okay, it’s just me with the last comparison for March. We tried to cover most of the relevant temperature technology on the market, but of course we can’t cover everything in one month. Don’t worry. We’ll come back to temperature soon.

Today, we have two fancy transmitters with some sweet advantages. On the left, the underdog SensyTemp TSP300-W from ABB! And on the right, the crowd favorite in this battle, Emerson’s Rosemount 648! By now, most of y’all know what we do next. But for the newcomers, we compare the most important features, highlighting the pros and cons of each device.

So take a seat, grab a Guaraná and popcorn, have a read, and draw your conclusions!

Note: This comparison covers only the features of the device, not the performance. If any community members have installed and used these devices, please comment below with your experiences so we all can learn more. Thanks!


You’ll never guess what I found when I unboxed the TSP300-W. Nothing special! This transmitter brings the same design and concept as all the other devices from ABB. Its simple design and functional display provide only what you need. You can choose from a variety of sensors, and the device will come to you with the sensor already connected. Yay.

Rosemount 648
Courtesy of ABB and Emerson Automation Solutions

On the other hand, unboxing the 648 gave me a surprise. Hey, it looks like all the other Rosemount devices! Fantastic, right? Not at all. Why did I write this? Nobody cares. Anyway, yeah. You get a standard Rosemount wireless with the same display and concept found in the rest of the Rosemount portfolio. The 648 also supports different sensors, but Emerson gave this device a new function. We’ll get to that later, though.


Although the TSP300-W is simpler than the 648, the ABB device offers an LCD display so you can set up in the field without a field communicator. If you don’t have a field communicator, you’ll benefit big-time from this feature. And even if you do, it still simplifies your setup, so I’m calling this one a definite plus.

Rosemount 648
Courtesy of ABB

You can order the 648 with a local LCD display, which you can install in different positions, as it rotates 90 degrees. This display will show you your process variables and diagnostics. Unfortunately, it won’t let you set up locally. You may not care, if you already have a field communicator. It is, after all, a digital transmitter, so once you set up, you can do everything remotely. Still, I like having the option.


The TSP300-W can take different sensors like thermocouples, RTDs, ohms, and millivolts. You can also install two sensors, either for a redundancy or to use the second sensor for basic calculation. A nice feature! You can do a standard installation, using a thermowell welded in the pipe. However, you may want to consider the surface installation. We’ll talk about that in a minute.

On the other side, the 648 keeps up in flexibility. It too can support thermocouples, RTDs, ohms, and millivolts. And like the TSP300-W, the 648 can combine with a surface sensor. Yes, yes, we’re almost there!

Surface monitoring technology

Here we go! The TSP300-W offers an easy way to monitor and control your temperature, but for some reason you can’t find any mention of it in the documents. Using the surface sensor can simplify installation, but most people worry about the accuracy of this method. ABB confirms, saying in the instructions that the surface sensor offers less accuracy than a traditional setup. Booo.

ABB SensyTemp TSP300-W
Courtesy of ABB

You can use this sensor from -196 to 600 degrees Celsius. But if you want to use the energy harvester, then you’ll have a different min/max, which sucks! The clamp for the sensor has a range of 6 to 20 inches, pretty good coverage. I still haven’t found any concrete numbers on the accuracy, though. Hmmm.

Rosemount 648
Courtesy of Emerson Automation Solutions

The 648 with the 0085 pipe clamp sensor, on the other hand, gives you cake and pie. Emerson makes it completely clear where and how to use its technology. I read an interview with Melissa Ruths from Emerson, and she said that you can use the Rosemount 648 in nearly any application except fast control loops, safety loops, and custody transfer.

When the interviewer asked her about accuracy, she said it has a built-in calculator that combines surface temperature, ambient temperature, and pipe information to give you an accurate reading. That’s nice, but still no numbers. Hmmmmm.

Wireless communication

The TSP300-W only has one option for wireless range. The omnidirectional antenna can cover up to 300 meters in an open area. You can set up the update time from 4 seconds to 60 minutes, and ABB recommends 16 seconds.

The 648 has a standard external antenna, but if you want long range, then you can get an extension. The update time ranges from 1 second to 60 minutes.

Battery life

ABB claims the battery on the TSP300-W can last seven years. However, you can buy an option that eliminates the need to change the battery. We’ll get to that in the next part.

The Rosemount 648 promises up to 10 years, but even better, you can use the power module life estimator, the Emerson’s online tool, to simulate your conditions and get an actual calculation. For example, if you set your 648 to transmit every second in an environment of 30 degrees Celsius, you’ll get less than a year. If you switch to 16 seconds, then you’ll bump it up to nearly seven years. Big difference!

Fancy features

The TSP300-W brings an advanced feature that can eliminate your need for a new battery, the energy harvester! Basically, the device has a thermoelectric generator (micro-TEG) that recharges your battery through differences in process and ambient temperatures. However, using the energy harvester crushes your temperature range down to between -40 and 150 degrees Celsius. Massive loss there.

ABB SensyTemp TSP300-W
Courtesy of ABB

The Rosemount 648 has the built-in temperature calculator mentioned earlier as its fancy feature.


The pros and cons on these two devices turn this comparison into an apples-and-oranges kind of thing. I really like the energy harvester, but its chopped range badly limits its applications, which puts it back on the same level as the 648.

Either of these can fit perfectly in certain processes. So what’s your choice?

Courtesy of

This table should help you analyze the features:

Table of content ABB vs Emerson

If you want a different device, then browse the list below:

Recommended articles

Product Review: Ecofrog from E-Sensorix

Featured Level Product Review

Product Review: NOVUS Logbox Wi-Fi

Articles Product Review