How to measure interfaces with very similar densities
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Dear teachers, the density of organic substances is 1020, while that of water is 997. What instrument should be used to measure the interface of organic substances? Ask for the model
You can use a densitometer to measure interfaces with very similar densities, and it is also necessary to choose a high-precision densitometer to ensure the accuracy of the measurements. For this situation, it is recommended to choose the DMA 5000 M or DMA 4100 M density meters from Anton Paar. Both models feature high precision and stability, and can be used with necessary accessories such as temperature controllers to achieve more accurate measurement results. Additionally, they are equipped with user-friendly interfaces that make density measurement simpler and more convenient. -
To measure the interface between aqueous and organic liquids with similar densities, differential pressure interfacemeters, which are based on the principle of gravity difference between the two phases, are generally not suitable. A capacitive interface gauge can be considered, but its measurement accuracy decreases in situations where the temperature of the material varies significantly or where the organic and water components are partially miscible.
Such a similar density is too low to be distinguished using density; neither differential pressure level gauges nor servo level gauges are able to measure it. Capacitive types can also be used because there is a significant difference in dielectric constants between water and organic substances, but they may not work as well; I haven’t seen any of them used here. Personal suggestion: If the two media can be easily distinguished by eye and there are no control requirements, it is simplest, most stable, and most reliable to use a glass plate as a bypass pipe, allowing direct visual inspection at the site.
In addition to density detection, the two media can also be distinguished by considering differences in other physical parameters such as dielectric constant, thermal conductivity, color, and refractive index.
When the densities are too similar, it’s not easy for them to separate into layers. Things like float balls are relatively difficult. Is it extraction? An overflow tank? What are organic substances, and what is their viscosity like? If adhesion is not a problem, guided wave radar can be used.
If the dielectric constants differ significantly, can guided-wave radar be used?