As part of the VE control system upgrade at EX we had to redo the PI controller to maintain the level of the tank.  Though settings are not optimal they will certainly work with some small overshoot. Settings are Gain 6. Integral 360, Derivative 0.  ideally I would like to eliminate the overshoot but this system is so slow I want to let it run like this for a couple of days.  Will be good to see what happens Tuesday when the LN2 get delivered.