Liquid level monitoring relays

High-performance monitoring of liquid levels

ABB's liquid level monitoring relays are used for regulation and control of liquid levels and mixture ratios for conductive fluids. The range includes single function and multifunctional devices that can be used for overflow, dry-running protection of pumps, filling and draining applications as well as maximum and minimum level alarms. A wide selection of accessories complete the offer.

Main benefits

• Latest approvals for reliable use worldwide 
• High EMC immunity due to advanced measurement technology supports reliability in harsh conditions
• Easy to adjust via front side potentiometer
• Easy to install with Easy Connect push-in technology
• Tool-free mounting and demounting

Main features

• Wide range power supplies such as 24–240 V AC/DC
• Adjustable measurement sensitivity 
• Adjustable response sensitivity
• Compact housing, 22.5 mm wide

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Our assortment

New CM-ENS range
Economic CM-ENE range
Innovative Connection Technology


  • Wide range power supplies like 24–240 V AC/DC reduce drastically the number of variants and ensure a worldwide use
  • High immunitiy against electromagnetic disturbances due to advanced measuring technology
  • Adjustable sensitivity of the measuring system
  • Adjustable response sensitivities
  • Fill (UP) or Drain (DOWN), adjustable
  • Control of one or two liquid levels (min/max)
  • 2 c/o (SPDT) contacts
  • Selectable ON- or OFF-delay


  • Compact housing, 22.5 mm (0.89 in) wide
  • Housing material for highest fire protection classification UL 94 V-0
  • All materials fulfill the highest environmental standards


  • Simplifies planning, maintenance and service
  • 2 wiring technologies: Screw terminals or Easy Connect Technology
  • Tool-free mounting and demounting on DIN rail
  • 3 LEDs for the indication of operational states
  • Easy adjustment via front side potentiometers
  • Electrodes are available as accessories


  • Monitoring of pump systems for dry running (ENE MIN) and overflow (ENE MAX)
  • Connection of 2 electrodes possible at C and MIN/MAX
  • 3 supply voltage versions
  • Optimal price / performance ratio
  • 1 n/o contact: Open-circuit principle for CM-ENE MIN, closed-circuit principle for CM-ENE MAX
  • LED for status indication

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