Selection, use, and calibration of stratified liquid level measurement sensors?
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I wonder if anyone has encountered situations where it is necessary to measure the level of layered liquids. For example, in a storage tank containing an oil-water mixture, leaving it undisturbed for an extended period can cause the oil layer and the water layer to separate. The first approach is to detect when the depth of the lower layer exceeds a certain value; in such cases, recirculation is necessary, that is, the liquid from the lower layer is drawn back to the feed inlet so that it can be mixed again with the other substances ； 2. Or, discharge the sediment from the lower layer and inject new material. In this case, it is impossible to avoid the lower depth of the detection layer; since automatic control is required, primary instruments such as observation windows cannot be used. We tried using Siemens ultrasonic level sensors, but the tuning results were once again not very satisfactory. Do any of you have any solutions or experiences you’ve used, or any tips on sensor calibration?
What is the conductivity? At the interface, the conductivity value often experiences a sudden change; therefore, it can generally be determined qualitatively, but not quantitatively with precision
Thank you, that’s an excellent approach; I’ve learned a lot from it. I hadn’t considered this aspect before; I had only thought about how differences in density lead to different reflectivities. Indeed, the stratification is gradual, with no very clear boundaries between layers. Actually, the control precision doesn’t need to be extremely high either, but there still needs to be a benchmark (1cm?) Or 10cm? ). But are there any application solutions for the differences in electrical properties such as conductivity between the upper and lower layers? Forgot to mention that there is a low-speed stirrer that remains on at the middle and lower levels inside the tank……
How about the floating ball? Level gauge?
For 3Q, the main goal is still to use two types of instruments; ideally, a method with high versatility would be best. After checking some information, it seems that the differential pressure method is more suitable. Are there any disadvantages to the differential pressure method in practical field applications?
If the density difference is quite large, magnetostriction could be an option; we have encountered this situation as well where the density difference is too small, making it difficult to decide on a suitable method. Currently, we are using conductivity measurements and interfacial analysis tools, and will evaluate the results in the end.
The oil/water interface is relatively easy to measure. Our company’s STU10 liquid stratification detector is primarily used to measure the thickness of the oil layer and the emulsion layer in settlement tanks and storage tanks in oil fields. Another STU01 liquid level detection switch is primarily used to detect changes in the liquid level within the drainage pipe, thereby enabling automated drainage
The details for STU01 are in the attachment.
What is the actual performance in use? Can a prototype be provided for testing? We are using toluene and water
Toluene and water are fine. It can be tried for free. But a trial contract needs to be signed
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