"By constantly monitoring motor parameters and coolant temperature, a sophisticated algorithm is used by the controller unit to calculated the current coolant flow rate. The accuracy does not match the accuracy of an external flow sensor, but is entirely sufficient for monitoring purposes. Alternatively, a mechanical flow sensor can be connected to the fan output for a more accurate flow measurement.
A temperature sensor directly connected to the stainless steel housing of the pump ensures a very accurate coolant temperature sensing."- I was wondering because of this text in D5 description....