Earthsafe CAT DEF Urea Buffer Tank Interface

UM5-BTI Cat DEF Buffer Tank Refill Interface

Generator SCR Emissions Control

The UM5BTI Cat DEF Urea Buffer Tank Refill Interface provides automatic refilling for Caterpillar SCR DEF Urea Buffer Tanks from remote bulk storage tanks and pumps.  The unit is installed adjacent to the the buffer tank to provide the required low pressure feed to the buffer tank.  Controls interface with generator systems with High, Low, Leak contacts or optional Modbus / BACnet connectivity.

Get The Data Sheet


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: Pump Request Signal to Remote


  • Inlet Solenoid Valves with Ball Valve
  • Solenoid Valve
  • Pressure Regulating Valve
  • 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.