Rosemount 848T vs SMAR TT481WH
Hey, gang! How’s it going? Last week we took a break from the product reviews, so we’re ready to get back to the ring, right? This month we want to focus on temperature, so we’ll align our product reviews and comparison with our hot topic! Haha, I made a funny.
The fighters today both come equipped with a really cool skill. Yup, they’re wireless and that’s awesome! I love wireless communication and am thrilled that more automation segments have adopted it as a standard.
Never mind that, though. You can read about wireless in other articles on Visaya. Here we want to talk about these transmitters and their features.
So let’s cut to the chase and welcome the competitors of the week! On the right, we have the Rosemount 848T from Emerson and on the left, the TT481WH from SMAR! Take a seat, grab a beer and popcorn, have a read, and draw your conclusions!
Full disclosure: 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!
The Rosemount 848T comes with a sharp design. It’ll make a good impression on you as soon as you see it and when you start playing with it. For instance, it makes cable entry and terminal connection simple. When you open the transmitter to access the cable terminal, you’ll see part of the input on the right, the battery in the middle, the HART input below, and the rest of the input on the left. Sounds simple, right?
It doesn’t have local configuration, but you can connect the device to your network with your handheld, then use the remote access to finish the configuration from your control room, if necessary.
The TT481WH has a simple design, an enclosure similar to a junction box, where you have the input and electronic components. On the plus side, it provides surprisingly good flexibility with its application and sensor options.
It has an internal display, which you can see if you open the enclosure. Not sure if it needs a local display, but if you need to do an intervention in the field, then that may make the difference for you.
Emerson has done a great job pushing wireless communication recently, creating a huge portfolio of wireless transmitters and developing different approaches to make your life easy in the field.
Most wireless transmitters have a range of almost 250 meters. A few have only 50 or 100, but you have options to reach further with them too. You can buy an extended range antenna, but while it’ll improve your range, it’ll eat more of your battery. You can also use a repeater, depending on your needs. Get your numbers together before you start shopping, people!
SMAR has an enviable wireless portfolio compared to even big vendors on the market. SMAR’s products can cover most applications, although they lack extended range antennas. You may have to go with a repeater for this one.
The Rosemount 848T has four configuration inputs and can support RTDs, thermocouples, volts, ohms, and 4-20 mA. However, if you need volts, then you’ll need an adapter. It looks like the factory installs it when you order one, but what if you want it later?
Here, the TT481WH has an advantage, because you can have four inputs or eight! You can use RTDs, thermocouples, millivolts, ohms, and 4-20 mA. Same problem here, though. If you order the transmitter with a specific input and need a different one later, can you change it? People, y’all need to clarify!
As soon as you hit the 848T’s specs list on the Emerson site, you’ll see accuracy as +-0.3 degree Celsius. However, the manual suggests different accuracies depending on the sensor! For example, if you have a pt50 with a range between -200 to 550 degrees Celsius, then you’ll get +-0.57 degree Celsius. But if you have thermocouple type K, you’ll get +-1.0 degree Celsius. Fortunately, they have calculations in the manual that can help you figure it out.
The same happens when you grab SMAR’s catalog. It starts with +-0.03 percent accuracy. The website says 0.2 percent, but it shifts according to which measurement you use.
In the end, the accuracy of either device should cover your application, but check your sensors before picking, okay?
Information and documentation
Okay, here Emerson does a good job! The smartphone-friendly site allows you to find documents easily. You can read the manual online or watch videos to learn more about the device. Some of the videos are kinda old, which adds another level of entertainment, if you like that sort of thing.
SMAR, on the other hand, needs to step up its game. The website isn’t mobile, and the documentation is hard to find and occasionally even sloppy! I found good articles written by Cesar Cassiolato, but he works for a different company now, so that’s a limited plus.
None here. On to the next topic! But before you go, read our article on why we do product reviews and comparisons.
The Rosemount 848T almost looks fancy compared to the TT481WH, but both devices can deliver the data if that’s all you need. You want fancy, you’ll need to keep shopping.
This table of features may help you compare: