Emerson Oil Management System

The OMB maintains the proper oil level in the compressor crankcase for low voltage applications. It is ideal for all brands of semi-hermetic compressors and recommended for Copeland Scroll™ compressors.


  • Precision oil level measurement for maximum protection
  • Easy monitoring with alarm and status lights
  • Foam resistant design prevents nuisance trips unlike optical sensor designs
  • Contaminant proof operation ensures accurate control
  • Only approved oil level control for Copeland Scroll Compressors
  • 5-time lockout feature protects compressor from repeated low oil level condition
  • Self-contained unit with oil level sensor and integral solenoid to manage oil level supply
  • Reverse Hall-effect sensor for precise measurement of oil level and protection from sensor magnetic debris contamination
  • SPDT output contact for compressor shut-down and alarming
  • Easy installation by sight-glass replacement


Maximum Working Pressure
870 PSI

350 PSI

Supply Voltage
24 Vac, 50/60 Hz

Solenoid Coil
ASC 2L, 24 Vac, 50/60 Hz


Time Delay for Low Level Signaling
5-10 seconds

Time Delay Alter Set-Point Recovery
5-10 seconds

Alarm Delay Time
120 seconds

Alarm Switch

Alarm Contact Rating
10A @ 125 Vac, 5A @ 220 Vac 50/60 Hz

No. Description
EMER-OS-OMB-JB1 OMB-JB24 / OMB-JB1 (PCN: 065365)