What is an interface level

When and where should we do an interface level measurement

If two liquids have different specific gravity mixed in one tank then the separation line of them is an interface. When the tank is filled with two different specific gravity of liquid this level called interface level

Interface level measurement is common in the oil and gas, chemical industries. An interface is a limit between two immiscible liquids, due to its density difference. The interface measurement finds the limit between the two liquids, therefore, to calculate the measurement of both quantities of liquid