Alicat Flow Vision SC - Manual (Page 20)

20
Valve Tuning — If you require specialized valve tuning, you may do this via
the “Control” section in the “Advanced” section.
Adjustment of PD&I values will change how the valve responds, valve stability
and valve speed.
It is strongly recommended that adjustments to PD&I settings not be made
unless you have some experience with proportional valve tuning.
Adjusting The PD&I Settings Without Prior Training May Result In
Permanent Damage To Your Control Valve.
Valve offset or preload is a setting to compensate for the mechanical pressure
effects that gas pressure may exert on the control valve. Gas pressure in the
system exerts a mechanical force on the control valve that, depending upon
the gas pressure, may slow its response when opening.
By increasing valve offset, a signal is sent to the valve that will increase its
force when opening.
Adjusting valve offset may help your Alicat controller respond more quickly
when moving away from a zero set-point.
Valve offset is a value between 0 and 100, 0 being little to no offset and 100
being maximum offset.
If your controller uses an Alicat medium sized valve, the offset effect is reversed.
0 being maximum offset and 100 being little to no offset.
Valve offset has no effect at a zero set-point.
Info Tab
The info tab provides specific information about the unit.
This information is helpful when requesting telephone support or authorization
for recalibration or repair.