Tescom ER3000 User Manual page 39

What can be done to eliminate the offset is the addition of integral term. The
resulting response follows:
The application should now be tuned for the system working in the mode of
toggling between 625 and 1875 psi. The system can be fine tuned to optimize
speed or stability by adjusting the tuning parameters. The system can be further
tuned by selecting different pressure settings and testing the response. The final
tuning should be done at pressures that are representative of how the system will
be operated.
38 ER3000 User Manual