Why Choose the ABB CM-ENE MIN Liquid Level Relay?
The ABB CM-ENE MIN (1SVR550850R9500) is a compact and reliable conductive liquid level monitoring relay designed to detect minimum liquid levels in industrial tanks, reservoirs and process vessels. As part of the ABB CM-ENE liquid level monitoring relay series, it provides dependable level detection using conductive electrodes, helping protect pumps and associated equipment against operation when insufficient liquid is available.
The CM-ENE MIN uses the electrical conductivity of the monitored liquid to detect whether the level has reached the installed sensing electrode. Its minimum-level monitoring function is particularly suitable for pump dry-running protection, low-level alarms and industrial process control. The relay provides an electrical switching signal that can be integrated with motor starters, contactors, alarm systems and automation equipment.
With a rated control supply of 110–130 V AC, the ABB CM-ENE MIN is designed for industrial installations using compatible AC control circuits. Its compact DIN rail-mounted housing enables straightforward installation inside electrical control panels, while its conductive sensing principle offers a practical solution for monitoring electrically conductive liquids.
Key Advantages
- Reliable minimum liquid level monitoring relay for industrial tanks and reservoirs.
- 110–130 V AC control supply suitable for compatible industrial electrical systems.
- Designed for conductive liquid level detection using external sensing electrodes.
- Provides minimum-level monitoring to identify insufficient liquid levels.
- Helps protect pumps against dry-running conditions caused by inadequate liquid supply.
- Integrated relay output supports connection to contactors, alarms and industrial control systems.
- Suitable for low-level monitoring in water storage and industrial process applications.
- Electrode-based sensing enables level detection without moving mechanical floats.
- Compact DIN rail-mounted design saves space in electrical control cabinets.
- Can be integrated with industrial automation systems for dependable liquid level supervision.
Key Features
- ABB CM-ENE liquid level monitoring relay series.
- CM-ENE MIN minimum-level monitoring configuration.
- 110–130 V AC rated control supply.
- Designed for monitoring electrically conductive liquids.
- Conductive electrode-based liquid level detection.
- Minimum-level monitoring for pump protection and low-level signalling.
- Integrated electromechanical output relay for control and alarm circuits.
- Detects changes in conductivity between connected sensing electrodes.
- Suitable for integration with external level sensing electrodes.
- Supports automatic low-level detection in industrial process systems.
- Compact modular housing for electrical control panel installation.
- DIN rail mounting for convenient installation.
- Terminal connections for control supply, sensing electrodes and relay output.
- Suitable for industrial pump control and liquid level monitoring applications.
Technical Specifications
- Manufacturer: ABB
- Series: CM-ENE Liquid Level Monitoring Relays
- Model: CM-ENE MIN
- ABB order code: 1SVR550850R9500
- ABB product group: 310921-Measuring & Monitoring Relays
- Product type: Liquid level monitoring relay
- Monitoring function: Minimum liquid level detection
- Rated control supply voltage: 110–130 V AC
- Supply type: Alternating current (AC)
- Measurement principle: Conductive liquid level sensing
- Sensor type: External conductive electrodes
- Monitored medium: Electrically conductive liquids
- Output type: Electromechanical relay
- Protective application: Pump dry-running prevention and minimum-level monitoring
- Control integration: Relay output for contactor, alarm or control circuit connection
- Mounting type: DIN rail mounting
- Installation location: Electrical control panels and industrial control cabinets
- Connection type: Terminal connections
- Application category: Industrial liquid level monitoring and pump protection
Reliable Minimum Liquid Level Monitoring for Industrial Automation
Industrial pumping and liquid handling systems require dependable level monitoring to prevent equipment damage and maintain stable operation. When a tank or reservoir reaches an excessively low liquid level, pumps may operate without sufficient liquid, potentially causing overheating, seal damage and premature mechanical wear. The ABB CM-ENE MIN liquid level relay helps address these risks by detecting minimum liquid levels through connected conductive electrodes.
The relay operates by evaluating the electrical conductivity between sensing electrodes installed in the monitored vessel. When conductive liquid establishes the required electrical path, the relay recognises the presence of liquid at the sensing position. When the liquid level falls below the minimum sensing electrode, the conductive path changes and the relay responds by switching its output contact.
This switching signal can be incorporated into a pump control circuit to stop a pump, prevent a start command or activate a low-level alarm. The CM-ENE MIN is specifically intended for minimum-level supervision, making it suitable for applications where maintaining an adequate liquid supply is essential.
The 110–130 V AC supply version can be integrated into compatible industrial control systems, while its DIN rail-mounted construction supports convenient installation alongside contactors, motor protection devices and automation components. Correct electrode positioning, suitable liquid conductivity and appropriate control circuit design are essential for dependable operation. The relay monitors liquid level through its sensing circuit and does not directly switch the main power supply of a pump motor.
Typical Applications
- Minimum liquid level monitoring in industrial storage tanks.
- Pump dry-running protection in water handling systems.
- Low-level detection in reservoirs and collection vessels.
- Industrial water supply and transfer systems.
- Wastewater handling systems with suitable conductive liquids.
- Process tanks and industrial liquid handling equipment.
- Cooling water circulation and supply monitoring.
- Industrial pump control panels and automation cabinets.
- Low-level alarm signalling in process control systems.
- OEM machinery incorporating conductive liquid level monitoring.
