01
Cubic, space-saving design
The cubic day-tank form fits crowded generator rooms and enclosures, and the refill modules mount compactly right beside the engine.
Choose your flow class
Sized to the tank in front of you.
Select a model to see where it fits in the family. Every class shares the same filtration, controls, and enclosure — only the flow rate changes.
UM5-DTP
Day Tank · HDPE25-100 GAL (100 - 400L)
The same cubic DEF day tank in corrosion-proof HDPE plastic — a lightweight, cost-saving alternative to stainless for generator SCR storage. Space-saving in enclosures and generator rooms, and customizable with the same instrumentation, heaters, and pumps as the stainless UM5-DTS.
Power
120-230 VAC, 1 Phase
Controller
UL 508, PLC Basis with HMI
Best for
Lightweight, cost-saving DEF storage
UM5-DTS
Day Tank · Stainless25-100 GAL (100 - 400L)
A cubic stainless-steel DEF day tank that provides safe storage for generator SCR emissions control. The space-saving cubic design fits crowded generator rooms and enclosures, and can be customized with instrumentation, heaters, and pumps in single-wall, double-wall, or double-wall insulated construction.
Power
120-230 VAC, 1 Phase
Controller
UL 508, PLC Basis with HMI
Best for
Corrosion-proof DEF storage in the genset room
UM5-BTI
Cat Buffer Tank Interface1–5 GPM
A refill interface engineered for Caterpillar SCR DEF buffer tanks, delivering the low-pressure feed they require from remote bulk storage and pumps. A pressure-regulating valve and pump-request signaling maintain the buffer tank automatically, installed right beside the engine.
Power
120-230 VAC, 1 Phase
Controller
UL 508, PLC Basis with HMI
Best for
Low-pressure feed to Cat SCR buffer tanks
UM5-RAR
Reservoir Auto-Refill1–5 GPM
A refill module that automatically maintains DEF level in an engine's on-board reservoir, drawing from UM5 day tanks or remote bulk storage and pumps. Installed right beside the reservoir, it monitors level and refills on demand for uninterrupted SCR operation.
Power
120-230 VAC, 1 Phase
Controller
UL 508, PLC Basis with HMI
Best for
Refilling engine on-board DEF reservoirs
Flow range
Family span · 0–300 GPM
0
25
50
75
100 GAL
Shared technology
The same engineering in every module.
02
Built for generator SCR
Designed specifically for generator SCR systems — safe DEF storage and delivery to keep emissions controls supplied on demand.
03
Corrosion-proof materials
Tanks in 304 stainless steel or cost-saving, lightweight HDPE, in single-wall, double-wall, or double-wall insulated construction.
04
Controls & BMS integration
UL 508 PLC controls with HMI communicate tank status to BAS, generator controls, switchgear, security, and fire-alarm systems.
Model comparison
The whole family, side by side.
Model
Flow
Capacity
Power
Controller
Best for
UM5-DTP
Day Tank · HDPE
None
25-100 GAL (100 - 400L)
120-230 VAC, 1 Phase
UL 508, PLC Basis with HMI
Lightweight, cost-saving DEF storage
UM5-DTS
Day Tank · Stainless
None
25-100 GAL (100 - 400L)
120-230 VAC, 1 Phase
UL 508, PLC Basis with HMI
Corrosion-proof DEF storage in the genset room
UM5-BTI
Cat Buffer Tank Interface
1–5 GPM
None
120-230 VAC, 1 Phase
UL 508, PLC Basis with HMI
Low-pressure feed to Cat SCR buffer tanks
UM5-RAR
Reservoir Auto-Refill
1–5 GPM
None
120-230 VAC, 1 Phase
UL 508, PLC Basis with HMI
Refilling engine on-board DEF reservoirs
All models filter water + particulate to 1 micron · ISO 18/16/13 · NEMA 4 (IP65) · C81 controller, BACnet / Modbus
Built for DEF at the engine
From the genset room to the reservoir.
Day storage in the genset room
Cubic UM5-DT tanks store 25–100 gallons of DEF in stainless or HDPE, saving space in crowded enclosures and rooms.
Auto-refill engine reservoirs
The UM5-RAR mounts beside the engine reservoir and automatically maintains its DEF level from day tanks or bulk storage.
Caterpillar buffer-tank feed
The UM5-BTI delivers the low-pressure feed Caterpillar SCR buffer tanks require, refilling them from remote bulk storage.
Adaptable for special operation
Dual inlet valves, monitored valve positions, overflow pumping, emergency evacuation, fluid metering, and high-temp control.
Equipment & options
Configured for your install.
Every UM5 module ships with a complete valve, gauge, sensor, and connection package for DEF, and adapts to the material, wall type, and control requirements of the site.
Standard equipment
Inlet solenoid valves with strainer & ball valve
4- or 5-point level sensor + leak sensor
Standard vents
Direct-read level gauge
Inspection port & cap
DEF supply & return connections
UL 508 PLC controller with HMI
Options
Single / double wall / DW insulated
Stainless steel or HDPE construction
Level & temperature transmitters
Pressure-regulating valve (BTI)
Overflow pumping / emergency evacuation
Modbus / BACnet connectivity