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1SVR730850R2200 ABB CM-ENS.23S Liquid Level Filling and Draining Monitoring Relay
ABB CM-ENS.23S (1SVR730850R2200) liquid level monitoring relay with 110–130 V AC or 220–240 V AC control supply, selectable filling and draining functions, 0.1–1000 kΩ adjustable sensitivity, three-electrode minimum and maximum level monitoring and one changeover contact for pump protection and automatic tank control.
£78.55
Why Choose the ABB CM-ENS.23S Liquid Level Monitoring Relay?
The ABB CM-ENS.23S (1SVR730850R2200) is a versatile liquid level monitoring relay designed for automatic filling and draining control in industrial electrical systems. Part of the ABB CM-ENS measuring and monitoring relay range, it monitors the level of electrically conductive liquids using electrodes, helping protect pumps against dry running and tanks against overflow.
The CM-ENS.23S provides selectable filling (UP) and draining (DOWN) functions, allowing one relay to support different liquid level control applications. It can monitor minimum and maximum liquid levels using suitable conductive electrodes, with an adjustable response sensitivity of 0.1–1000 kΩ to accommodate liquids with different electrical conductivities.
Designed for 110–130 V AC or 220–240 V AC control supplies, the relay features one changeover (SPDT) output contact rated at 250 V / 4 A. Its compact 22.5 mm DIN rail housing, screw terminal connections and front-mounted adjustment controls make it suitable for water treatment installations, pumping stations, industrial tanks and automated liquid handling systems.
Key Advantages
- Reliable automatic liquid level monitoring for conductive fluids.
- Selectable filling and draining control using a front-mounted adjustment control.
- 110–130 V AC or 220–240 V AC control supply for industrial electrical installations.
- Adjustable sensitivity from 0.1–1000 kΩ to accommodate different conductive liquids.
- Supports minimum and maximum liquid level monitoring for automatic tank control.
- Helps protect pumps against dry running and tanks against overflow.
- One changeover (SPDT) output contact rated at 250 V / 4 A.
- Uses conductive electrode measurement without requiring mechanical float switches.
- Three LED indicators provide clear operating and relay status information.
- Front-mounted controls simplify configuration and commissioning.
- Compact 22.5 mm housing width saves space in electrical control panels.
- DIN rail mounting and screw terminals support straightforward installation.
- Suitable for integration with pump contactors, PLCs and industrial alarm systems.
Key Features
- ABB CM-ENS.23S liquid level monitoring relay.
- Manufacturer part number: 1SVR730850R2200.
- Rated control supply: 110–130 V AC or 220–240 V AC.
- Rated supply frequency: 50/60 Hz.
- Monitoring medium: Electrically conductive liquids.
- Selectable operating modes: Filling (UP) or draining (DOWN).
- Liquid level monitoring: Minimum and maximum levels.
- Adjustable response sensitivity: 0.1–1000 kΩ.
- Electrode configuration: Three electrodes for two-level monitoring.
- Output: One changeover (SPDT) relay contact.
- Contact rating: 250 V / 4 A.
- Status indication: Three LEDs.
- Terminal technology: Screw connections with double-chamber cage terminals.
- Mounting: DIN rail installation.
- Housing width: 22.5 mm.
- High electromagnetic compatibility for industrial environments.
- Cascadable design for extended liquid level control applications.
- Flame-retardant housing material classified UL 94 V-0.
- Optional compatible electrodes and sealable transparent protective cover.
Technical Specifications
- Manufacturer: ABB
- Series: CM-ENS Liquid Level Monitoring Relays
- Model: CM-ENS.23S
- ABB order code: 1SVR730850R2200
- ABB product group: 310921-Measuring & Monitoring Relays
- Product type: Liquid level filling and draining monitoring relay
- Rated control supply voltage: 110–130 V AC / 220–240 V AC
- Rated frequency: 50/60 Hz
- Monitoring function: Filling or draining
- Monitored medium: Conductive liquids
- Level monitoring: Minimum and maximum liquid levels
- Number of electrodes: 3
- Measuring range: 0.1–1000 kΩ
- Sensitivity adjustment: Front-mounted potentiometer
- Operating mode selection: Filling (UP) / draining (DOWN)
- Output contacts: 1 changeover (SPDT) contact
- Contact rating: 250 V / 4 A
- Rated operational current AC-12: 4 A at 230 V
- Rated operational current AC-15: 3 A at 230 V
- Rated operational current DC-12: 4 A at 24 V
- Rated operational current DC-13: 2 A at 24 V
- Minimum switching capacity: 12 V / 10 mA
- UL/CSA contact rating: B300
- Maximum output operating voltage (UL/CSA): 300 V AC
- Rated insulation voltage: 300 V
- Rated impulse withstand voltage: 4 kV
- Status indication: 3 LEDs
- Terminal type: Screw terminals with double-chamber cage connections
- Terminal tightening torque: 0.8 N·m
- Protection rating: IP50 housing / IP20 terminals
- Mounting type: DIN rail mounting
- Housing flammability classification: UL 94 V-0
- Operating ambient temperature: −25 to +60 °C
- Storage temperature: −40 to +85 °C
- Dimensions (H × W × D): 85.6 × 22.5 × 103.7 mm
- Net weight: 0.154 kg
- EAN: 4013614502897
- Customs tariff number: 85364900
Reliable Liquid Level Control and Pump Protection
The ABB CM-ENS.23S monitors the electrical conductivity between electrodes installed at selected liquid levels inside a tank or vessel. As the liquid rises or falls, contact with the electrodes changes the monitored electrical resistance. The relay uses this information to determine whether the liquid has reached the configured minimum or maximum level and to switch its output contact accordingly.
In filling mode (UP), the relay can be used to control a pump or inlet valve so that a tank is refilled when the liquid reaches its minimum level and filling stops when the maximum level is reached. In draining mode (DOWN), it can be used to activate a discharge pump when the liquid reaches the upper level and stop pumping once the lower level is reached. These functions support automatic tank operation without continuous manual intervention.
The adjustable sensitivity range of 0.1–1000 kΩ allows the CM-ENS.23S to accommodate different conductive liquids and electrode arrangements. This makes it suitable for applications involving water, wastewater and other electrically conductive process liquids. The relay is not intended for non-conductive liquids such as oils or fuels, and the compatibility of the electrodes with the liquid must be considered during installation.
Its single changeover output contact provides a switching signal for pump contactors, control relays, PLC inputs or alarm circuits. The relay is designed for monitoring and control rather than directly switching high-power pump motors, so an appropriately rated contactor or other switching device should be used where the load exceeds the relay contact rating.
With a compact DIN rail housing, three LED status indicators and accessible front-mounted controls, the CM-ENS.23S provides a practical solution for automated filling, draining, overflow prevention and pump dry-running protection in industrial and commercial liquid handling installations.
Typical Applications
- Automatic filling of water storage tanks and reservoirs.
- Automatic draining of collection tanks and sumps.
- Pump dry-running protection in water handling systems.
- Tank overflow protection and high-level monitoring.
- Minimum and maximum liquid level supervision.
- Water treatment and wastewater processing installations.
- Industrial pumping stations and drainage systems.
- Process tanks containing electrically conductive liquids.
- Commercial and industrial water storage systems.
- Liquid level monitoring in manufacturing and processing equipment.
- PLC-controlled pump automation and alarm signalling.
- OEM machinery incorporating automatic liquid level control.
Technical Specifications
Tick the specs you need, then view products that match.
| Monitoring Function | Liquid level | |
|---|---|---|
| Signal / Input Range | 0.1–1000 kΩ |
Frequently Asked Questions
What is the ABB CM-ENS.23S used for?
The ABB CM-ENS.23S is a liquid level monitoring relay used for automatic filling and draining control of tanks containing electrically conductive liquids. It can also support pump dry-running protection, tank overflow prevention and minimum or maximum liquid level monitoring.
What supply voltage does the ABB CM-ENS.23S require?
The CM-ENS.23S, ABB order code 1SVR730850R2200, is designed for 110–130 V AC or 220–240 V AC control supplies at 50/60 Hz. It is an AC-powered version and should not be confused with the CM-ENS.21S, which uses a 24–240 V AC/DC supply.
Can the CM-ENS.23S control both filling and draining?
Yes. The relay provides selectable filling (UP) and draining (DOWN) operating modes. In filling mode, it can control refilling between minimum and maximum liquid levels. In draining mode, it can control liquid removal between the same level limits.
What is the sensitivity range of the CM-ENS.23S?
The relay has an adjustable response sensitivity of 0.1–1000 kΩ. This setting allows it to detect conductive liquids with different electrical resistance characteristics and can be adjusted using a front-mounted potentiometer.
How many electrodes does the CM-ENS.23S use?
The CM-ENS.23S supports a three-electrode configuration for monitoring minimum and maximum liquid levels. The electrodes provide a common reference and two level detection points for automatic filling or draining control. Suitable electrodes are available separately.
Can the ABB CM-ENS.23S protect pumps against dry running?
Yes. When installed with suitable electrodes and a correctly configured control circuit, the CM-ENS.23S can detect a low liquid level and provide an output signal to stop or inhibit pump operation. This helps prevent dry running where insufficient liquid is available.
Can the CM-ENS.23S be used for tank overflow protection?
Yes. The relay can monitor an upper liquid level and provide a switching signal when that level is reached. In a suitable control system, this signal can stop a filling pump, close an inlet valve or activate an alarm to help prevent tank overflow.
Does the CM-ENS.23S work with all liquids?
No. The relay is designed for electrically conductive liquids, such as many types of water and wastewater. It is generally unsuitable for non-conductive liquids such as oils and fuels. Electrode material compatibility and the electrical conductivity of the liquid must be checked for the intended application.
How many output contacts does the relay have?
The ABB CM-ENS.23S features one changeover (SPDT) output contact rated at 250 V / 4 A. This contact can be used for pump contactor control, alarm signalling or connection to a PLC input, subject to the electrical load requirements.
What is the difference between the CM-ENS.21S and CM-ENS.23S?
Both models support conductive liquid level monitoring, filling and draining control, adjustable sensitivity and one changeover output contact. The main difference is the control supply voltage: the CM-ENS.21S uses 24–240 V AC/DC, while the CM-ENS.23S uses 110–130 V AC or 220–240 V AC.
What type of electrical connections does the CM-ENS.23S use?
The relay uses screw terminals with double-chamber cage connections. These provide secure connections for the control supply, electrode measurement circuit and changeover relay output.
Where is the ABB CM-ENS.23S typically installed?
The CM-ENS.23S is designed for DIN rail mounting inside electrical control panels, pump control cabinets and industrial automation enclosures. Its compact 22.5 mm housing width helps conserve installation space.
Trusted by Industrial Automation Professionals Worldwide
ABB CM-ENS liquid level monitoring relays provide dependable solutions for automatic tank filling, draining, overflow prevention and pump dry-running protection. With selectable filling and draining functions, adjustable sensitivity, conductive electrode monitoring and compact DIN rail installation, the CM-ENS.23S supports reliable liquid level control in industrial pumping, water treatment and process automation systems.
