Has anyone used a double-flange densitometer? What brand is it?
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Recently, due to process requirements, the factory needs to add a density control circuit. Since mass flow meters are too expensive, our chief engineer thought of the double-flange density meters that were used in the past; I’ve never heard of them before... If anyone has used them, please recommend some brands – I’d be extremely grateful! I think it’s similar to a double-flange pressure gauge; the only difference is the algorithm used~~
Measuring density with a mass flow meter is relatively inexpensive; there’s also another type of density meter that is much more costly, costing over one million. Domestic mass flow meters can be used
I haven’t used the double-flange densitometer you mentioned, but there are several manufacturers that produce it, such as Focus Technology, Meishan Online, and Rosemount; you might want to check with them.
Find a densitometer of the Emerson 7826 and 7828 types; the working principle is as follows: all HighPoint liquid density sensors operate on the same principle, which is similar to that of a mass-spring system. After a mass is loaded onto a spring and then released, the mass-spring system vibrates at its natural frequency until it comes to rest due to viscous damping. Resonance can be maintained by applying a driving force to the mass to overcome damping. When the density of the product under test changes, the vibrating mass in the density sensor also changes, which can be detected through a change in the resonant frequency.
Our unit uses a single-flange densitometer, from ABB
Double flange design, from E+H; the distance between the two flanges is fixed. As the density changes, the pressure also changes, and by measuring this pressure, the density can be determined. The prerequisite is that the liquid level must be above the upper flange. You’re right; it’s the differential pressure transmitter.
Actually, I also considered the solution mentioned above, but since my setup is connected to a return pipeline, and given that the pressure at the pump’s outlet is very high, the pressure of the material in the pipeline might be too low relative to that outlet pressure; as a result, it’s not possible to maintain a stable pressure at the pump outlet, nor to accurately measure the required data. That’s why I gave up on that approach.
The accuracy of this measurement method is indeed poor.
The pipeline differential pressure density meter is installed at the pump outlet; it can be placed in a straight section of pipe that is located some distance away. For situations with high flow rates, it is possible to use a density meter with a larger diameter or to install it via a bypass – as long as the flow rate remains relatively stable, measurement is possible. Most of the densitometers we use in wet flue gas desulfurization are installed at the outlet of the circulation pump.