Earthsafe UM5rar DEF Urea Engine Reservoir Auto Refill

UM5-RAR DEF Engine Reservoir Auto-Refill

Generator SCR Emissions Control

The UM5-RR DEF Urea Reservoir Refill Unit provides automatic refilling on engine on-board DEF reservoirs from UM5DT Day Tanks or remote bulk storage tanks and pumps.  The unit is installed adjacent to the the engine reservoir to monitor and maintain the DEF Urea level.  Controls interface with generator systems with High, Low, Leak contacts or optional Modbus / BACnet connectivity.

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Data Sheet: UM5RAR Data Sheet


  • Material: Stainless Steel 304 
  • Capacity: 1-5 GPM
  • Power 120-230 VAC, 1 Phase, 50-60 Hz
  • Controller: UL 508, PLC Basis with HMI
  • Interface: Output Relays for High, Low, Leak and Modbus (Optional BACnet)


  • Inlet Solenoid Valves with Strainer and Ball Valve
  • High Level Sensor and Leak Sensor
  • Level Transmitter
  • Standard Vent
  • Direct Read Level Gauge
  • DEF Supply and Return Connections

DEF Urea Systems Built for Generators: 

The UM5 DEF Urea Day Tank Products are specifically designed for generator SCR systems.  The cubic design is space saving within enclosures or generator rooms.  Available in Stanless Steel 304 or cost saving and lightweight HDPE plastic.   

Integrated Building Management Systems: 

Earthsafe advanced controllers allow for the communication of vital tank operating information to other building systems. These systems may include Building Automation Systems, generator controls, switchgear and other power controls, security and fire alarm systems.

Readily Adaptable for Special Operation: 

Earthsafe day tanks can be readily adapted for special operation characteristics such as: dual inlet valves, monitored valve positions, high level / overflow pumping, emergency evacuation, auto-commissioning, fluid metering, high temperature control.