Russell offers two energy-saving refrigeration controllers for walk-in freezers or coolers — Surveillant and KE2 Evap OEM. Both have remote monitoring and diagnostics.
Surveillant Controller
Surveillant Controller

Standard features
- Eliminates unnecessary defrosts
- Maximizes energy efficiency with less compressor run time
- Reduces liability by eliminating icing issues
- Demand defrost reduces temperature fluctuations for improved product quality
- Remote monitoring and system control
KE2 EVAP OEM
- For use with Russell’s Next-Gen All-Temp Unit Coolers – controller is factory-installed inside the unit
- For quick start guide, master view screens and more information, visit http://ke2therm.com/product/ke2-evap-oem
Surveillant
- First product to perform true demand defrosts utilizing real-time measurements of the system’s performance to determine when to initiate defrost
- Easily integrates with Energy Management Systems
- For use with Russell’s Ceiling-Temp Low Height Unit Coolers – controller is factory-installed on the exterior of the unit