Delivery Unit: Notes
The delivery unit is located on the reservoir at the top end of the function unit. Among other things, the delivery unit comprises the pump that transfers the urea-water solution from the active reservoir to the metering module. The delivery unit is also heated by a PTC element
The heating element in the delivery unit is connected to the heater for the metering line to form one heating circuit. a power semiconductor supplies the current for this heating circuit. The power semiconductor is controlled by the DDE. The DDE can determine the current that flows across the heating elements and can therefore monitor operation.