What is the interface liquid level measurement?
Measurement of the interface level is used to keep track of the level of two liquids with different specific gravity. When two liquids are in the same tank but can't mix, they are separated by an emulsion layer. When two materials that don't mix well together are put together, the liquid with the heavier molecules will sink to the bottom and the liquid with the lighter molecules will stay on top. Oil and water is a perfect example of this.
If two liquids in the same vessel or tank have different densities, or specific gravity, the denser liquid will sink to the bottom and the less dense liquid will float on top. The Interface is the place where these two liquids meet.
How is interface level calculated?
To figure out the transmitter's calibrated range, you should remember the following:
The total level should be at least as high as the upper (low pressure) tap or higher.
Either a remote seal system or a wet leg can be used to measure this.
The height and density (SG3) of the reference level must be constant.
At the lower range value (LRV), 4 mA, the tank is filled with lighter fluid (SG2).
At the upper range value (URV), 20 mA, the tank is filled with the heavier fluid (SG1).
A calibrated range of 4 to 20 mA is produced by a DP transmitter, which essentially measures the difference in pressure applied to H.P. and L.P. tap.
What is the interface liquid level measurement?
Measurement of the interface level is used to keep track of the level of two liquids with different specific gravity. When two liquids are in the same tank but can't mix, they are separated by an emulsion layer. When two materials that don't mix well together are put together, the liquid with the heavier molecules will sink to the bottom and the liquid with the lighter molecules will stay on top. Oil and water is a perfect example of this.
If two liquids in the same vessel or tank have different densities, or specific gravity, the denser liquid will sink to the bottom and the less dense liquid will float on top. The Interface is the place where these two liquids meet.
How is interface level calculated?
To figure out the transmitter's calibrated range, you should remember the following:
The total level should be at least as high as the upper (low pressure) tap or higher.
Either a remote seal system or a wet leg can be used to measure this.
The height and density (SG3) of the reference level must be constant.
At the lower range value (LRV), 4 mA, the tank is filled with lighter fluid (SG2).
At the upper range value (URV), 20 mA, the tank is filled with the heavier fluid (SG1).
A calibrated range of 4 to 20 mA is produced by a DP transmitter, which essentially measures the difference in pressure applied to H.P. and L.P. tap.
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