Selection of level gauges
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As the title says. The information is as follows: Composition of the upper layer liquid: large amounts of cyclohexane (with a small amount of ethanol dissolved in it) ； Composition of the lower layer liquid: large amounts of water (with some ethanol dissolved in it). Both phases are colorless and transparent, with only differences in density and refractive index; there are emulsion layers of varying thickness between the layers, at a temperature of 40°C. Purpose of selecting a level gauge: To control the bottom discharge valve based on the liquid level, in order to remove the aqueous phase while preventing the cyclohexane phase from being discharged. This process is continuous. Has anyone encountered similar selection issues? If so, please share your insights; thank you
Is anyone there? I need help :(
Is anyone there? I need help :(
I haven’t encountered situations where it’s necessary to measure two different densities that are immiscible with each other; are the interface fluctuations large? If it’s not very large, a regular double-flange differential pressure transmitter, along with two level switches that can measure density as a supplement, should work fine
This post was last edited by chenyuyan on 2019-6-17 11:42 using a float level gauge. Or a remote-transmission magnetic flap level gauge, with a float whose density is lower than that of water but higher than that of cyclohexane
Since there is a mixed-phase layer, there is no real two-phase interface; then what’s the point of using a level gauge? It will give incorrect readings, so how can such data be used to guide proper discharge? For reliable drainage, it is necessary to measure the density of the sediment layer.
Install two float level gauges; different densities result in different measured levels
Weighing and flow rate conversion can also be used to determine whether the water has run out; just write a program for that
The main thing is that this is a three-component mixture with an emulsion layer in between; it’s sufficient as long as the aqueous phase can be discharged smoothly. Is it okay to use differential pressure?