Product review: Rheonik RHE08
Have you ever done a zero adjust in the field? Engineers new and old have tips for doing it, but the smart operator follows the vendor instructions. Some folks do zero adjusts to solve measurement misalignments or unstable measurements. Not the best way to solve any kind of problem!
Before you do anything, you need to make sure that your process follows all the basic requirements. Skipping a step can reduce your meter’s performance! You can break these rules if you fancy yourself a rebel, but you’ll lose more than your cool later when your process starts to suck and you don’t know why.
On to the review! Today we have another new brand at Visaya.Solutions. Rheonik’s products may seem unfamiliar, but they’ve been out there for a long time. We have the RHE08, combined with a standard flow sensor, to review here. Companies follow different philosophies on presenting their products, which can make it hard to pick a transmitter and sensor from one brand, much less all the names out in the market. We’re here to help with that.
With no more ado, let’s see the real power of this product! If you’ve never heard of Rheonik, then take a minute to take a look.
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?
First, you should keep your expectations low. Rheonik’s devices are kinda bare-bones compared to other brands. We’ll focus on sussing out its essential features and seeing if it can deliver high-level results, but in a review we need to comment on everything, including user experience.
Rheonik markets the RHE08 as a wall-mounted universal application. If you want another way to install your transmitter, then check the other models on the website. The RHE08 has a semi-compact design at 332 x 218 x 146 millimeters and a weight of 4.7 kilograms. It has a simple LCD display with 16 characters and 2 lines, where you can see the basic data on your flow measurement and do local configuration.
Speaking of which, three buttons on the front of the transmitter let you navigate through the menu. It’s easy, in an 80s kind of way. The local setup falls short in the user experience, but at least it’ll take care of you if you don’t have a field communicator.
As for integration, we have only HART over analog, RS485, RS422, and RS232. No sign of digital protocols here like FOUNDATION Fieldbus or PROFIBUS PA. Rheonik has another device with PROFIBUS DP if you’re okay with switching models. Oh, and for outputs, you have two analog, one frequency/pulse, and three digital status! Sound good?
What can it do?
No big surprises here. The RHE08 will deliver the same level of data as most devices like it – mass and volume flow, density, and temperature. Based on density information and other factors, you can also have measurements such as percent of concentration and Brix, which isn’t standard but is common for Coriolis meters.
I wish companies would organize their portfolios on some sort of standardized format. Ugh. Okay, I wanted one of their sensors to include here, and Rheonik sorts theirs by size and flow range. We’ll use the RHM20, a sensor sized from one to three inches.
First, the sensor has the “U” or omega design. This traditional shape helps prevent pressure drops but takes up extra room. The sensor provides an accuracy of 0.15 percent in flow measurement and 0.5 percent in density, modest values compared to the competition. However, remember that you only need a device with enough accuracy for your process and no more.
Why should I care?
Because it has a few rather nice points. You can use this sensor in temperatures from -196 to 350 degrees Celsius and pressures up to 392 bars. It provides a surprisingly rich list of possibilities for wetted materials, with options such as 316Ti, 904L, C22 alloy, tantalum, and still others on request.
It uses the traditional four wires for power and communication, but the transmitter can use power from different sources, either 24 volts direct current or 110/220 volts alternating. Furthermore, it has a protection level of IP65 and ATEX/CSA approvals for hazardous areas, and if you have a bath or filling application, then you can use this device without any problems.
The RHE08 and its sensors are a workable option on the market, bringing all the basic requirements of the industry and lacking in only a few points. You just need to set it against the requirements of your application and see if it fits.