ABB CM-ENS.13S Level Monitoring Relay, 24-240 V AC/DC, 1 Changeover Contact, DIN Rail 1SVR730850R2100

The ABB CM-ENS.13S is a level monitoring relay engineered for conductive liquid level control. Its standout capability is precise detection of minimum and maximum levels using a three-electrode conductive measurement principle, ensuring reliable operation in tanks, wells, and industrial processes.

Advantages

This relay offers a wide supply voltage range of 24-240 V AC/DC, making it adaptable to various power systems. The adjustable sensitivity from 0.25 kΩ to 100 kΩ allows fine-tuning for different liquid conductivities, while the ON/OFF delay (0.5–10 s) prevents false switching due to turbulence. A single changeover contact rated at 4 A / 250 V AC provides robust control of pumps, valves, or alarms. DIN rail mounting and a compact 22.5 mm housing simplify installation in control cabinets.

Suitable for

• Fill or empty control of conductive liquids (water, wastewater, chemicals)
• Overflow and dry-run protection for pumps
• Level alarm in storage tanks and reservoirs
• Industrial automation and building services

Key specifications

• Supply voltage: 24-240 V AC/DC
• Output: 1 changeover contact, 4 A / 250 V AC
• Sensitivity range: 0.25 kΩ to 100 kΩ
• Time delay: 0.5 s to 10 s (ON/OFF)
• Electrodes: 3 (Min, Max, Common)
• Mounting: DIN rail, width 22.5 mm
• Protection: IP50 housing, IP20 terminals
• Operating temperature: -25 to +60 °C
• Standards: IEC/EN 60255-6, UL 508, CSA 22.2 No. 14

Recommendations

For reliable conductive level monitoring in demanding environments, pair the CM-ENS.13S with appropriate electrodes and ensure proper grounding of the liquid. Always verify conductivity against the sensitivity range for optimal performance.