Can i use DP transmitter to measure interface level?

Hai guys, i have a problem in my job. Anyone can explain how to measure interface level with DP? Actually now we are using displacer type. But the transmitter sometimes error.

Thanks

A simple method to measure the interface level with Dp transmitter:
Fill the tank 100% with low specific gravity fluid and set the zero.
Fill the tank 100% with high specific gravity fluid and set the span.
Doneā€¦ a best simplest method.

If you cannot fill the tank for your calibration.
Set the zero and span based on gravity of low and high fluid keeping the height of the tank same.