““How to measure the dielectric constant of diesel with a density of 0.93 and water with a density of 1?” — Answer from Leit user
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. . ““How to measure the interface between diesel with a density of 0.93 and water with a density of 1?” – Answer from Leit: It’s difficult to determine this interface, so there’s no need to try to measure it. Think of things in a different way; don’t focus on where the interface lies. Taking a hydrometer as an example, if its reading is higher than 0.99 grams per cubic centimeter, it means that the interface is far away from the drain outlet, so just drain the water boldly :lol.
It’s a good method; it’s not possible to achieve high clarity at the interface, and using differential pressure to measure density provides greater accuracy compared to using a float.
Double flanges can be used to measure interfaces, and there are many other instruments that can measure cross-sections, such as guide radar
The double-flange type should work; the density difference between 0.93 and 1 is relatively small, so frequent calibration is required.
The original poster really has a broad mind; I admire that. At first, I thought of using guided-wave radar to measure the interface, as we learned during training that Siemens’ guided-wave radar has similar applications; however, the density under these operating conditions is too high, so it’s likely that measurement would be very difficult.
Buying a genuine EJA double-flange should work
It can be measured using a magnetic expansion level gauge; a double-flange level gauge could also be considered. The zero point is reached when the entire flange area is filled with diesel, while the full measurement range is achieved when the entire flange area is filled with water. In fact, the pressure difference is generated by the difference in densities between the two fluids and the distance between the flanges. This pressure difference is quite small; measurements are more accurate when the distance between the flanges is large, but less accurate when the distance is small. For example, if the resulting pressure difference is 0.5 KPa and the transmitter’s minimum measurement range is 2.5 KPa, then, if the transmitter has sufficient precision, the signal can be amplified in the DCS system