Hello, all you lovely people. Ready to talk temperature transmitters? Good! Today, we’re gonna review a transmitter with a great feature. Yup, you guessed it, wireless communication built right in. We’ll check out the other features as we go too. Say hello to the Rosemount 848T.

The Rosemount 848T wireless temperature transmitter from Emerson Automation Solutions is one of their shiniest products of this line.

Take a seat, grab a juice today, have a read, and draw your conclusions!

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

Rosemount 848T specifications

The 848 has been around for a while. If you run a search for the Rosemount 848T, you can find videos from 6 years ago! Don’t fret, though. This transmitter is still relevant, even modern if you consider its abilities in data capture and the built-in wirelessHART. Words like robust, flexible, and seamless define the 848T.

Rosemount 848T
Courtesy of Emerson Automation Solutions

Depending on your company, you may have more or less wireless acceptance. The instrumentation world still has a lot of myths and misunderstandings about wireless solutions. Furthermore, the technology has yet to consolidate with control loops, but we’ll get there.

Wireless brings a lot of benefits and a wide range of possibilities in monitoring to explore. The 848T makes for a good example. You can have up to four sensors on one transmitter with no snake nest of cables from the field to the control room! The data can enter the system through different protocols like Modbus, EtherNet-IP, OPC, and others.

Rosemount 848T features

The 848T allows you to measure different process variables across the plant with minimum effort. You have four inputs, where you can connect RTDs, thermocouples, and analog signals. You can even get creative and change a standard cable application to wireless. Unfortunately, the transmitter won’t supply energy to your field device, and you can only read the variables mentioned above.

The 848T has a standard accuracy of +-0.3 degrees Celsius with 2 years of stability. Not bad. However, it only does remote monitoring. If you want an Emerson device with local display and remote monitoring, then you’ll need to pick a different transmitter. Kinda bad.

Rosemount 848T
Courtesy of Emerson Automation Solutions

If you have a third-party gateway based on wirelessHART, the 848T will connect with no problem. Afterwards, the gateway will send the data from the field to the control system with different standardized protocols.

As a bonus, the setup is simple. You only need a plant access management system or handheld with the correct device description file (DD) to have full access through the menu configuration.

Why should I care?

Depending on where you install a field device, you sometimes need a repeater, which costs extra. The 848T, on the other hand, offers an extended range option, which may make a repeater unnecessary!

Rosemount 848T
Courtesy of Emerson Automation Solutions

The 848T also has a great battery that can give you up to 10 years of juice. I simulated several situations using Emerson’s power module life estimator and got some good results. For example, with 16 seconds of update rate in a strong network, the power module could last 2.4 years.

In general, the 848T wireless offers plenty of benefits. If you want to know more about wireless, we have a bunch of technical content on Visaya to help you out.

Before we go, check out this old but gold video, where you can learn more about the Rosemount 848T:

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