Hi, I´m trying to set PID-controller to following: If temperature is too high, a flow rate should increase, as well. If temperature is too low, flow rate should decrease. So far, PID- controllers usually do right the other way round: If temperature too low, increase flow rate. In my system, I want to heat an air flow in a cross flow heat exchanger. If the air flow rate is too high, it exceeds the heat exchangers power, and the outlet temperature can´t reach the desired temperature. Thanks Tom |