That's my point why even consider a PID even if you strangle it to a P & limit it's range. However, as a learning curve a P controller is not a bad idea, whether it will work efficiently or not will depend on a lot of factors. but also on this point a P only controller will almost be like doing a simple bit of maths so as the error reduces so does the speed, again this leads to a long fill time.
I have been in this game for over 37 years now & would never use a PID in a batching process unless it was just to control a given feed rate not amount. often used in making Mayonnaise where oil addition has to be controlled at a given rate, the amount is always done either with load cells or flow meters so the PID is purely to get the flow rate right.
I have been in this game for over 37 years now & would never use a PID in a batching process unless it was just to control a given feed rate not amount. often used in making Mayonnaise where oil addition has to be controlled at a given rate, the amount is always done either with load cells or flow meters so the PID is purely to get the flow rate right.