1. New liquid level monitoring relays
EPR Product presentation
CM-ENS
New liquid level monitoring relays

2. Liquid level monitoring and control relays
CM-ENS are the new liquid level monitoring relays
They replace the former ENS and ENN relays
Liquid level monitoring relays are typically used in pump applications
Depending on the application they control pumps to fill or empty containers with liquid
In such applications the liquid level is detected by electrodes in conductive fluids
© ABB Group
November 10, 2018

3. Liquid level monitoring and control relays
New CM-ENS – features and benefits
Benefits
High EMC immunity due to advanced measurement technology leads to reliability in harsh conditions
Wide-range supply design reducing the number of variants
Compact 22,5 mm (0.89 in) wide housing
Housing material according highest fire protection classification UL 94 V-0
All materials fulfill the highest environmental standards
2 wiring technologies
Screw connection
Easy connect
Tool-free mounting and demounting on DIN rail
Easy to adjust via front side potentiometer
© ABB Group
November 10, 2018

4. Liquid level monitoring and control relays
New CM-ENS – features and benefits
General features:
Temperature range -25…+60°C
3 Status LEDs
Approvals cULus 508, CB, GL/DNV, EAC, RMRS, CCC
Marks CE, RCM
© ABB Group
November 10, 2018

5. Liquid level monitoring and control relays
New CM-ENS - 3 types
CM-ENS.1xx CM-ENS.2xx CM-ENS.31x
© ABB Group
November 10, 2018

6. Liquid level monitoring and control relays
CM-ENS.1xx for drain protection
Supply voltage
CM-ENS.11x 24 – 240 V AC/DC
CM-ENS.13x 110 – 130 / 220 – 240 V AC
Connection technology
CM-ENS.1xP Easy connect with push-in
CM-ENS.1xS Screw connection
Adjustable response sensitivity kΩ
© ABB Group
November 10, 2018

7. Liquid level monitoring and control relays
CM-ENS.2xx for fill and drain protection
Supply voltage
CM-ENS.21x 24 – 240 V AC/DC
CM-ENS.23x 110 – 130 / 220 – 240 V AC
Connection technology
CM-ENS.2xP Easy connect with push-in
CM-ENS.2xS Screw connection
Adjustable response sensitivity 0, kΩ
Control of one or two liquid levels (min/max)
Fill (UP) or Drain (DOWN) selectable
© ABB Group
November 10, 2018

8. Liquid level monitoring and control relays
CM-ENS.31x for fill and drain protection
Supply voltage
CM-ENS.31x 24 – 240 V AC/DC
Connection technology
CM-ENS.31P Easy connect with push-in
CM-ENS.31S Screw connection
Adjustable response sensitivity 0, kΩ
Control of one or two liquid levels (min/max)
Fill (UP) or Drain (DOWN) selectable
Selectable ON- or OFF-delay
2 c/o contacts
© ABB Group
November 10, 2018

9. Liquid level monitoring and control relays
CM-ENS – working principle
Emptying a
tank = draining
Conductive measuring principle:
The liquid level monitoring relay puts an AC voltage onto the electrodes and monitors if a current is flowing or not
This principle works only with conductive liquids such as: water, drinking water, sea water, waste water, acids, base, liquid fertilizers, milk, beer, coffee, low-percentage alcohol, etc.
Not suitable for:
Chemically pure water, oils, paraffins, or explosive fluids: Fuel/petrol, explosive liquids, ethylene glycol, high percentage alcohol
Common electrode:
When using a metal tank the electrode -C is not required. The cable can be connected directly to the metallic surface of the tank.
Filling a tank
© ABB Group
November 10, 2018

10. Liquid level monitoring and control relays
CM-ENS – advanced
Cascading: The electrode inputs can be intercon-nected as required, which ensures a simple monitoring of different liquid levels
© ABB Group
November 10, 2018

11. Liquid level monitoring and control relays
Applications
Typical applications for liquid level monitoring relays
Protection of pumps against dry running
Protection against container overflow
Control of liquid levels
Detection of leaks
Control of mixing ratios
Use of liquid level monitoring relays
All kind of motor starter solutions like
Star-Delta starters
Softstarter
Drives
© ABB Group
November 10, 2018

12. Liquid level monitoring and control relays Domestic applications
Pump control through level monitoring in domestic water tanks.
Water level control for swimming-pools to prevent dry-running or spillover when filling o draining the pool.
© ABB Group
November 10, 2018

13. Liquid level monitoring and control relays Mining Industry
Protection of submersible pumps for water extraction
Tank spillover protection for waste mining water processing (environmental hazard)
© ABB Group
November 10, 2018

14. Liquid level monitoring and control relays Oil Industry
Protection of pump cavitations for water reinjection for:
- water disposal
- secondary recovery
- formation fracture
Protection of spillover of injection water (environmental hazard)
© ABB Group
November 10, 2018

15. Liquid level monitoring and control relays Food Industry
Filling control of cistern trucks
Fill control of ingredients for food processing.
© ABB Group
November 10, 2018

16. Liquid level monitoring and control relays Special applications for pure and ultra pure water
Water as close as possible to H2O
The specific resistivity of the pure water varies between 0.1 MΩ.cm and 15MΩ.cm
Food industry: Preparation of beverage
Pharmaceutical and cosmetics: Preparation of buffers and culture media, glassware washing.
Medical applications: Water for dialysis.
Semi-conductor industry: cleaning the surfaces of semiconductor wafers and liquid crystal panels.
© ABB Group
November 10, 2018

17. Liquid level monitoring and control relays Electrodes
Bar electrode
For general-purpose use, such as water supply lines
For areas with limited space
When mounting strength is required
Suspension electrode
For installation at long distances from the liquid level
© ABB Group
November 10, 2018

18. Liquid level monitoring and control relays
Bar electrodes
© ABB Group
November 10, 2018

19. Liquid level monitoring and control relays
Suspension electrodes
New CM-HC Suspension electrode Art.-No. 1SVR R1000
New CM-HCT Suspension electrode, suitable for drinking water Art.-No. 1SVR R2000
CM-HE Suspension electrode Art.-No. 1SVR R0000
© ABB Group
November 10, 2018