ABB CM-ENS Level Relay

1. Product Overview

The ABB CM-ENS Level Relay is an industrial-grade liquid level control relay used for monitoring and controlling liquid levels in tanks, reservoirs, and vessels.
It detects changes in liquid level and triggers alarms, pump on/off actions, or control signals. The relay is easy to install, responsive, and reliable. It is compatible with standard conductive or capacitive level sensor signals and can interface with PLCs, controllers, and display units for precise level monitoring and control.

2. Technical Specifications

• Model: CM-ENS

• Type: Level Relay

• Brand: ABB

• Input Signal Type: Level sensors (conductive/capacitive) or switch contact

• Output Contacts: 1 Normally Open (NO) + 1 Normally Closed (NC) relay contact

• Rated Output Current: 5 A (AC 250 V / DC 30 V)

• Supply Voltage: AC 110–240 V (also available in 24 V DC version)

• Supply Frequency: 50/60 Hz

• Response Time: ≤ 50 ms

• Mounting: DIN rail 35 mm or panel mount

• Operating Temperature: -20 ℃ to +60 ℃

• Operating Humidity: 0–95% RH (non-condensing)

• Protection Class: IP20 (when installed in enclosure)

• Dimensions (approx.): 45 mm × 90 mm × 65 mm

• Weight (approx.): 0.15 kg

3. Key Advantages & Features

1. High Sensitivity Detection
   Fast response to liquid level changes for precise control actions.

2. Sensor Signal Compatibility
   Supports conductive, capacitive, and simple switch contact signals.

3. Standard Relay Output
   With rated contacts capable of driving pumps, valves, or control circuits.

4. Easy Installation
   DIN rail or panel mount simplifies integration into control systems.

5. Industrial Reliability
   Wide operating temperature range and strong anti-interference design for industrial environments.

4. Typical Applications

• Tank, reservoir, and vessel liquid level monitoring and control

• Wastewater and return water system automation

• Automatic pump start/stop control

• Cooling and heating system level protection

• Chemical, food, pharmaceutical, and HVAC systems

5. Installation & Usage Notes

1. Verify that the supply voltage matches the level relay’s rated voltage.

2. Disconnect power before wiring to ensure safety.

3. Keep sensor signal cables away from high-voltage noise sources.

4. Install in a well-ventilated control panel; avoid direct sunlight and damp locations.

5. During commissioning, set correct high/low level setpoints to avoid false alarms.

6. Periodically check the relay contacts and sensor connection integrity for long-term reliable operation.

The structure and details of the product：

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