8. Zero/Span Adjust.
Adjusts the valve's zero point and span.
There are two methods of adjustment:
Angle adjustment or manual adjustment.
With angle adjustment, the zero or span
signal is applied, and the valve travel is
adjusted based on the resulting angle.
This method is recommended over
manual adjustment.
Manual adjustment involves setting the
zero point and span point manually to
record their position. Use this method
when manual control is possible.