Buyer guide: Rosemount 5300 and Honeywell SLG 700 SmartLine

In the instrumentation world, physical data is king, and you need the proper subjects to handle his demands and convey his royal decrees. We here at Visaya stand ready to offer you counsel! Thus, we command to the throne the Rosemount 5300 and Honeywell SLG 700 SmartLine. May these guided wave radars serve your king’s every need. 

But you’re not into all that. So let’s get to it!

Rosemount 5300

All of our regulars should feel fairly comfy with level measurement and know a thing or two about radar by now. So we know that guided wave radar works well for low dielectric constants (DCs) or interface levels. And Emerson’s Rosemount 5300 is a good example of said radar, so let’s review its features and abilities.


The 5300 uses the time-of-flight (ToF) principle, calculating the time it taken for waves to travel through a product and back, like a bat does. But biologists call ToF echolocation.

Courtesy of Emerson

Anyway, the 5300 feels like any other Emerson device – great for familiarity and accuracy, not so much if you want to set up locally. You’ll need a handheld or field network to set up remotely.

In general, it’ll handle temps from -196 to 400 degrees Celsius, although the pressures depend on your tank connections. So remember to read the materials for those details.


The 5300 works in various DC values according to probe type. If you want a coaxial probe, then you’ll need at least 1.2. And these two factors also set your maximum range. The manual claims up to 50 meters, but only with a flexible single lead probe in a DC of more than 6. However, it also claims an accuracy of 3 millimeters or 0.03 percent of the measured distance.

Besides level, the 5300 can also measure the interface level, level rate, temperature, and volume of your process. On the other hand, Emerson also offers a list of no-nos for the device, like buildup or vapor.

You can pick one of five standard probes – rigid single lead, single flexible lead, coaxial, rigid twin lead, and flexible twin lead. And don’t eeny meeny miney mo it, either. If you have fibrous liquids, then you need the rigid single lead or flexible single lead. The others will fail to give you the readings you want.


The 5300 comes with analog, HART, Foundation Fieldbus (FF), and Modbus protocols. You can also connect a wireless adapter to send data to the system. As usual, no PROFIBUS here. If you want PROFIBUS, then you’ll need a converter.   

image for Rosemount 5300
Courtesy of Emerson

So will you consider the Rosemount 5300 for your next application? If so, then you may want to compare it with other players on the market.

Honeywell SLG 700 SmartLine

Now let’s turn to theHoneywell SLG 700 SmartLine. Honeywell has been around a bit, so let’s see if this device can help you.


At first glance, the 700 looks good – compact, with an optional three-button local configuration. The display can show process data, bar graphs, trend graphs, and signal quality, all in multiple languages.

image of Honeywell SLG 700 SmartLine
Courtesy of Honeywell

It can handle -60 to 450 degrees Celsius and pressures of -1 to 400 bar. It also works in liquids, slurries, and solids up to 50 meters at an accuracy of +-3 millimeters.


The 700 measures level, volume, or interface with one of three probes – single wire, single rod, and coaxial. You can also scale it out with the SmartLine tool using your smartphone or laptop. Pretty nifty!


The 700 runs on loop power and connects with analog, HART, or FF. If you need a different protocol or output, then you won’t find it here. But it comes with advanced diagnostics, which lets you take a peek inside the tank with the echo curve.

image of Honeywell SLG 700 SmartLine
Courtesy of Honeywell

Overall, the SLG 700 has some useful features that just may fit in your application.

Table of comparison


Rosemount 5300

SLG 700 




familiar design but no local configuration, need a handheld simple, compact design with push buttons




standard  LCD;  echo curve analysis; 15-parameter table, but only two rows on screen

LCD with advanced graphics; can install in various positions



Measurement range and probes

50 meters in solids, slurries, and liquids; five probe types


-60 to 450 degrees Celsius, -1 to 400 bar; three probe types



Materials, process connections, and protocols

PTFE, stainless steel, aluminum; analog, HART, FF, and Modbus  PTFE, stainless steel, aluminum; analog, HART, and FF



Information and documentation

decent website, even on mobile; good documentation; no online tools slightly difficult website; clear but slow documentation; good online tool



These devices seem evenly matched and fall in the “good enough” category. So check your needs and budget and scale them both. You may find one suits you better than the other.


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