Why Choose the ABB CM-ENE MAX Liquid Level Relay?
The ABB CM-ENE MAX (1SVR550851R9400) is a compact and dependable liquid level monitoring relay designed for maximum-level detection, filling supervision and overflow protection in industrial tanks, reservoirs and process vessels. As part of the ABB CM-ENE liquid level monitoring relay series, it uses conductive sensing electrodes to monitor liquid levels and provide a switching signal for industrial control systems.
This maximum liquid level relay detects when an electrically conductive liquid reaches a designated upper-level sensing point. It is particularly suitable for preventing tank overflow, controlling filling operations and providing high-level alarm signals. Its integrated normally open relay output allows straightforward integration with pumps, solenoid valves, contactors and automation equipment.
Designed for a 220–240 V AC control supply, the ABB CM-ENE MAX offers reliable monitoring for compatible industrial electrical installations. Its fixed 0–100 kΩ sensing range, closed-circuit operating principle and compact 22.5 mm DIN rail-mounted housing make it a practical solution for liquid level control panels and industrial process automation.
Key Advantages
- Reliable maximum liquid level monitoring relay for industrial tanks and reservoirs.
- 220–240 V AC rated control supply for compatible industrial control systems.
- Designed for overflow protection and filling monitoring.
- Uses conductive liquid sensing electrodes to detect high liquid levels.
- Fixed 0–100 kΩ sensing range simplifies configuration and installation.
- Integrated one normally open (1 n/o) relay contact for control and signalling.
- Closed-circuit operating principle provides defined switching behaviour.
- Helps prevent tank overflow, liquid spillage and unnecessary process interruptions.
- Supports automatic filling control through compatible pump or valve circuits.
- Electrode-based sensing avoids moving mechanical float components at the sensing point.
- Compact 22.5 mm housing width saves space in electrical control cabinets.
- DIN rail mounting enables convenient installation alongside industrial control equipment.
- Suitable for integration into water handling, process automation and industrial liquid management systems.
Key Features
- ABB CM-ENE liquid level monitoring relay series.
- CM-ENE MAX maximum-level monitoring configuration.
- 220–240 V AC rated control supply voltage.
- Designed for electrically conductive liquid level monitoring.
- Maximum-level detection for overflow protection.
- Suitable for filling monitoring and high-level control.
- Fixed 0–100 kΩ measuring range.
- Conductivity-based sensing using external electrodes.
- One normally open relay output contact.
- Closed-circuit operating principle.
- Supports switching of compatible external pump, valve and alarm control circuits.
- Screw-terminal connections for electrical installation.
- Compact modular housing with a 22.5 mm width.
- DIN rail mounting for industrial control panel integration.
- Suitable for automated liquid handling and tank filling applications.
Technical Specifications
- Manufacturer: ABB
- Series: CM-ENE Liquid Level Monitoring Relays
- Model: CM-ENE MAX
- ABB order code: 1SVR550851R9400
- ABB product group: 310921-Measuring & Monitoring Relays
- Product type: Liquid level monitoring relay
- Monitoring function: Maximum liquid level detection
- Primary functions: Filling monitoring and overflow protection
- Rated control supply voltage: 220–240 V AC
- Supply type: Alternating current (AC)
- Measuring range: 0–100 kΩ
- Sensitivity adjustment: Fixed
- Measurement principle: Conductive liquid level sensing
- Sensor type: External conductive electrodes
- Monitored medium: Electrically conductive liquids
- Output contacts: 1 normally open contact
- Contact configuration: SPST-NO (1 n/o)
- Operating principle: Closed-circuit principle
- Terminal type: Screw terminals
- Mounting type: DIN rail mounting
- Dimensions (H × W × D): 78 × 22.5 × 78.5 mm
- Net weight: 0.106 kg
- EAN: 4013614348075
- RoHS compliance: Following EU Directive 2011/65/EU
- Application category: Industrial liquid level monitoring and overflow protection
Reliable Maximum Liquid Level Monitoring for Industrial Automation
Industrial tanks, reservoirs and liquid handling systems require dependable level monitoring to prevent overflow and maintain stable process operation. Excessive liquid levels can cause spillage, equipment damage, environmental contamination and unnecessary production downtime. The ABB CM-ENE MAX liquid level relay helps address these risks by detecting when an electrically conductive liquid reaches a designated maximum-level electrode.
The relay evaluates the electrical conductivity between connected sensing electrodes. When the liquid reaches the upper sensing position, it establishes a conductive path that the relay detects. The CM-ENE MAX then changes its output state according to its closed-circuit operating principle, allowing the connected control system to respond to the maximum-level condition.
In a typical filling application, the relay output can be integrated into a pump starter or valve control circuit. When the monitored tank reaches its maximum level, the control circuit can stop the filling pump or close a suitable inlet valve. The same switching signal can also be used to activate a high-level alarm or provide a status input to a programmable logic controller.
The fixed 0–100 kΩ measuring range provides a straightforward sensing arrangement for suitable conductive liquids without requiring adjustable sensitivity settings. The 220–240 V AC supply version is designed for compatible industrial control circuits, while its compact DIN rail-mounted housing allows convenient installation alongside contactors, motor protection devices and automation components.
For dependable operation, the sensing electrodes must be positioned correctly and the monitored liquid must have sufficient electrical conductivity. The CM-ENE MAX is a monitoring and signalling device; its relay contact should operate an appropriately rated contactor, valve controller or other switching device rather than directly controlling loads that exceed the contact rating.
Typical Applications
- Maximum liquid level monitoring in industrial storage tanks.
- Overflow protection for water tanks and reservoirs.
- Automatic tank filling control systems.
- High-level alarm signalling in industrial process vessels.
- Industrial water supply and distribution systems.
- Wastewater and effluent handling systems with suitable conductive liquids.
- Cooling water storage and circulation systems.
- Process tanks in manufacturing and production facilities.
- Pump and solenoid valve control panels.
- Industrial liquid transfer and storage equipment.
- OEM machinery requiring conductive maximum-level detection.
