Product Review: Rosemount 5708 3D Solids Scanner
Nowadays, companies working with radar level measurement for bulk solids have a new nightmare to ruin their sleep, known as the 3D level scanner (today’s pick: the Rosemount 5708). This topic comes up more often now that Emerson has acquired APM. Before that, you didn’t hear much about this technology.
I’ve seen many conversations about it in the field, where radar vendors say 3D scanners are overkill for simple silo level measurements. On the other side, developers of this new tech keep insisting it can improve applications. Customers stuck in the middle have to figure out which solution will work best for them. And of course, what works for this one may not work for that one.
On the upside, a 3D level scanner like the Rosemount 5708 brings a bunch of advanced information and good level accuracy. On the downside, you need to spend a chunk more to get those features, because it’s an entire level solution rather than just a device to measure level.
So let’s dive into the 5708’s features and find out how it can support you in bulk solid applications!
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?
The first impression is quite good! The design of the Rosemount 5708 differs from other level measurement devices, but that’s not a bad thing.
It has an LCD display, protected by the front cover, which you can use to configure the device if you have the 5708L. The 5708V and 5708S only let you set up the polling address from that screen. To do the entire setup, you’ll need the Rosemount 3DVision software. Anyway, the local setup looks natural and straightforward; you have three push buttons to navigate the function menu.
You can choose from three models: average level, volume up to 12 meters in diameter, or volume with visualization. While the 5708 has a housing of polyurethane-covered aluminum, I couldn’t find much about it or other options. If you need something else, then reach out to your local rep.
Its antenna has several options, though: polyurethane-painted aluminum, PTFE-coated aluminum, and tons of high-temp versions. You’ll probably find what you need, but if you don’t, maybe poke your rep again?
What can it do?
Believe or not, it can measure the level and volume of bulk solids! It also offers extra data on the output, such as distance, mass, and temperature. It comes with a long list of units to choose from, so you can read your data in whatever format you like. Its easy installation provides several types of process connection, such as thread and angle adapters.
It uses three antennas to pick up its low-frequency acoustic waves, from 2.3 to 7 kilohertz. However, for a big vessel, you may need more than one transmitter. Fortunately, Emerson has a tool to guide you on that.
You can use the 5708 to measure up to 70 meters, but it has a dead zone of 0.5 m from the top of the antenna assembly. As for accuracy, distance measurement gets +-15 millimeters at reference conditions, directional has +-2 degrees, and volume will depend on the position of the device in relation to the product surface.
As a four-wire device, you need an external power supply from 18-32 volts. You can connect it to the control system using analog or Modbus RS-485. However, you have two other ways to get this data. You can convert the Modbus RS-485 to Modbus TCP/IP, or you can use wirelessHART, although that has limitations. Emerson’s THUM adapter can deliver data such as percentage, distance, and temperature, but you can’t set up the device with wirelessHART – yet?
Why should I care?
Because it gives you 3D data on your tank! Although you need the software for that. If you have only one vessel, then get the Rosemount 3DVision software; multiple tanks need the Rosemount 3DMultivision software.
You can also use it in process temps from -40 to 85 degrees Celsius (the high-temp version goes all the way to 180) and pressure ranges from -0.29 to 43.5 pounds per square inch.
This table compares the three models of the 5708. You can see whether one will fit better in your application than the others.
Usually, you’ll measure mass with the software, but you can do it manually in your control system as well. Finally, you have certifications to deploy it in hazardous locations, and it has an IP66/IP67 rating. For more details, check out Visaya’s device page.
The Rosemount 5708 3D Solids Scanner brings a lot of benefits for your application, but you need to decide whether it fits your needs before trying out those benefits. As I said, to get all the listed advantages, you have to deploy it as an entire solution. If you only want a simple solution, maybe other devices will suit you better.