Why Choose the ABB CM-ENS.23P Liquid Level Fill/Drain Monitoring Relay?
The ABB CM-ENS.23P is a compact and reliable liquid level monitoring relay designed for automatic filling and draining control in industrial tanks, reservoirs and pumping systems. As part of the ABB CM-ENS measuring and monitoring relay series, it monitors the level of electrically conductive liquids using connected electrodes, helping protect pumps against dry running and tanks against overflow.
This relay provides selectable fill (UP) and drain (DOWN) operating modes, with adjustable response sensitivity to accommodate liquids with different electrical conductivities. Front-mounted potentiometers simplify configuration, while three LED indicators provide clear visual feedback on operating conditions. Its maintenance-free Easy Connect Technology with push-in terminals enables quick, secure wiring without conventional screw connections.
With a rated control supply voltage of 110–130 V AC or 220–240 V AC, an adjustable measuring range of 0.1–1000 kΩ and one changeover (SPDT) output contact rated at 250 V / 4 A, the CM-ENS.23P is suitable for industrial liquid level automation. Its compact 22.5 mm-wide DIN rail housing allows straightforward integration into electrical control panels and pump control assemblies.
Key Advantages
- Reliable liquid level monitoring for automatic filling and draining applications.
- Selectable fill (UP) and drain (DOWN) operating modes for flexible pump control.
- Wide 0.1–1000 kΩ adjustable sensitivity range for conductive liquids.
- Supports 110–130 V AC and 220–240 V AC control supplies.
- One SPDT changeover output contact for switching control and signalling circuits.
- Helps prevent pump dry running and tank overflow through electrode-based level detection.
- Maintenance-free push-in terminal technology simplifies installation and servicing.
- Compact 22.5 mm DIN rail design saves valuable control cabinet space.
- Front-mounted adjustment controls and LED indicators simplify configuration and monitoring.
Key Features
- ABB CM-ENS liquid level monitoring relay series.
- Fill and drain monitoring for conductive liquids.
- 110–130 V AC / 220–240 V AC rated control supply.
- 0.1–1000 kΩ adjustable measuring range.
- 1 changeover (SPDT) output contact.
- 250 V / 4 A output contact rating.
- Selectable UP/DOWN operating principle using a front-mounted potentiometer.
- Adjustable response sensitivity for different liquid conductivities.
- Monitoring of minimum and maximum liquid levels using suitable electrodes.
- Three LED indicators for operational status indication.
- Easy Connect Technology with maintenance-free push-in terminals.
- High electromagnetic compatibility for industrial control environments.
- 22.5 mm housing width for compact installation.
- Tool-free mounting and removal from a DIN rail.
- Housing material with UL 94 V-0 fire protection classification.
Technical Specifications
- Manufacturer: ABB
- Series: CM-ENS Liquid Level Monitoring Relays
- Model: CM-ENS.23P
- ABB order code: 1SVR740850R2200
- Product group: Measuring & Monitoring Relays
- Product type: Liquid level fill/drain monitoring relay
- Monitoring function: Filling or draining of conductive liquids
- Operating modes: Fill (UP) / Drain (DOWN)
- Rated control supply voltage: 110–130 V AC / 220–240 V AC
- Supply frequency: 50 / 60 Hz
- Measuring range: 0.1–1000 kΩ
- Sensitivity adjustment: Front-mounted potentiometer
- Output contacts: 1 changeover (SPDT)
- Output contact rating: 250 V / 4 A
- Terminal type: Screwless push-in terminals
- Connection technology: ABB Easy Connect Technology
- Level detection: Conductive electrode measurement
- Status indication: 3 LED indicators
- Mounting type: DIN rail mounting
- Housing width: 22.5 mm
- Dimensions (H × W × D): 85.6 × 22.5 × 103.7 mm
- Net weight: Approximately 0.147 kg
- Operating ambient temperature: −25 to +60 °C
- Storage temperature: −40 to +85 °C
- Housing material classification: UL 94 V-0
- EAN: 4013614502835
Reliable Liquid Level Monitoring for Pump Control and Industrial Automation
Liquid level monitoring relays such as the ABB CM-ENS.23P use the electrical conductivity of a liquid to detect when its level reaches installed sensing electrodes. The relay evaluates the electrode signals and operates its output contact according to the selected filling or draining function. This allows external pump control equipment to maintain the required liquid level while reducing the risk of overflow or dry running.
The CM-ENS.23P supports level control between minimum and maximum sensing points, making it suitable for automated tank filling and emptying systems. Its adjustable sensitivity allows adaptation to different conductive fluids, while its changeover output can be integrated into contactor control circuits, alarm systems and industrial automation equipment. The compact DIN rail housing and push-in connections simplify installation in pump control panels and industrial distribution assemblies.
Typical Applications
- Automatic filling and draining of industrial storage tanks.
- Pump dry-running protection in water handling systems.
- Overflow prevention in reservoirs and process vessels.
- Water treatment and wastewater management installations.
- Industrial pump control panels and automation cabinets.
- Minimum and maximum liquid level monitoring.
- Cooling water and process water management systems.
- Conductive liquid storage and transfer applications.
- Level monitoring and alarm signalling in industrial processes.
- OEM machinery requiring automatic conductive liquid level control.
