Challenges：
Connect two PTs together through digital communication to calculate the DP value through pressure measurement.
Realize data transmission between instruments through standard two wire (4-20) mA+HART communication.
Solutions：
In high container, capillary length will be greater than 10m * 2, therefore suffering a great impact from ambient temperature.
Using double flange PT may bring slow response time and chances of error.
Advantage：
Its suitable for level measurement of high containers.
High accuracy, small ambient temperature impact, fast response, and good stability.
