Data sheet
Liquid level monitoring relay
CM-ENS.1x
The CM-ENS.1x serves to regulate and control
liquid levels and ratios of mixtures of conductive
fluids. It can be used for overflow protection, dry
running protection, filling or draining applications
as well as max- and min- level alarming. Suitable
electrodes are available as accessories.
Characteristics
–– Devices with wide range power supply 24-240 V AC/DC
–– Cascadable
–– High EMC immunity
–– Adjustable response sensitivity 5-100 kΩ
–– 3 LEDs for the indication of operational states
–– Screw connection technology or
Easy Connect Technology available
–– Housing material for highest fire protection classification
UL 94 V-0
–– Tool-free mounting and demounting on DIN rail
–– 22.5 mm (0.89 in) width
2CDC 251 001 V0015
The device is available with two different terminal
versions. You can choose between the proven
screw connection technology (double-chamber
cage connection terminals) and the completely
tool-free Easy Connect Technology (push-in
terminals).
Approvals
A UL 508, CAN/CSA C22.2 No.14
C
R
L
E
GL
T
DNV
(pending)
EAC
RMRS
(pending)
CCC
(pending)
Marks
a CE
b
RCM
Order data
Type
Rated control supply voltage
Output contacts
Connection technology
Order code
CM-ENS.11S
24-240 V AC/DC
1 c/o (SPDT) contact
Screw connection
1SVR730850R0100
CM-ENS.13S
110-130 / 220-240 V AC
CM-ENS.11P
24-240 V AC/DC
CM-ENS.13P
110-130 / 220-240 V AC
1SVR730850R2100
Push-in connection
1SVR740850R0100
1SVR740850R2100
Connection technology
CM-ENS.1xP
CM-ENS.1xS
2CDC 253 025 F0011
Approved screw connection technology with
double-chamber cage connection terminals
2CDC 253 026 F0011
Maintenance free Easy Connect Technology with
push-in terminals
Push-in terminals
Double-chamber cage connecting terminals
–– Tool-free connection of rigid and flexible wires with
wire end ferrule
–– Easy connection of flexible wires without wire end
ferrule by opening the terminals
–– No retightening necessary
–– One operation lever for opening both connecting
terminals
–– For triggering the lever and disconnecting of wires
you can use the same tool (Screwdriver according to
DIN ISO 2380-1 Form A 0.8 x 4 mm (0.0315 x 0.157
in), DIN ISO 8764-1 PZ1 ø 4.5 mm (0.177 in))
–– Constant spring force on terminal point independent
of the applied wire type, wire size or ambient
conditions (e. g. vibrations or temperature changes)
–– Opening for testing the electrical contacting
–– Gas-tight
–– Terminal spaces for different wire sizes
–– One screw for opening and closing of both cages
–– Pozidrive screws for pan- or crosshead screwdrivers
according to DIN ISO 2380-1 Form A 0.8 x 4 mm
(0.0315 x 0.157 in), DIN ISO 8764-1 PZ1 ø 4.5 mm
(0.177 in)
Both the Easy Connect Technology with push-in terminals and screw connection technology with double-chamber cage
connection terminals have the same connection geometry as well as terminal position.
2 - Liquid level monitoring relay CM-ENS.1x | Data sheet
Functions
Operating controls
1 Indication of operational states with LEDs
U: green LED - Status indication of control supply voltage
V control supply voltage applied
R: yellow LED - Status indication of the output relays
V energized
MIN/MAX: yellow LED - Status indication of the electrodes
V MIN and MAX wet
W MIN wet
2CDC 251 001 V0015
2 Adjustment of the response sensitivity
1
3 Marker label
2
3
Application / Monitoring function
The liquid level monitoring relay CM-ENS monitors and controls the liquid level and ratios of mixtures of conductive fluids. It
is used for filling or draining applications, to protect pumps against dry-running, tanks against overflow and for signalization
of the status of the monitored liquid level.
1SVC 110 000 F0161
1SVC 110 000 F0162
Application example
Liquid level control - fill
Liquid level control - drain
Data sheet | Liquid level monitoring relay CM-ENS.1x - 3
Operation mode with three electrodes
2CDC 252 013 F0015
The CM-ENS.1x measures the electrical resistance of the liquid between two immersion electrodes and a reference
electrode. If the relay is connected to the rated control supply voltage, the output relay changes its switching state as soon
as the liquid level reaches the MAX-electrode, while the minimum sensor is submerged. The relay returns to the original
state as soon as the minimum sensor is no longer in contact with the monitored medium. In order to exclude electrolytic
phenomena in the liquid, the sensors are supplied with alternating current.
Operation with three electrodes
Operation mode with two electrodes
2CDC 252 073 F0004
If only one level should be controlled, only the MAX-electrode shall be connected at the monitoring relay (see picture
Operation with two electrodes).
Operation with two electrodes
4 - Liquid level monitoring relay CM-ENS.1x | Data sheet
Cascading of several devices
With the CM-ENS.1x it is possible to use two devices in one tank. This enables, to realize a pre-warning with additional
electrodes. In this way, two additional alarm outputs for exceeding or dropping below the normal level can be implemented
in addition to the filling levels MAX and MIN. Also reserve pump can be connected to the additional device.
Pump control
Alarm, empty
Device A
Device B
MAX
MIN
C
MAX
Reserve pump
for filling
Device A
Device B
MIN
Alarm
Fillling with alarm empty
Pump control
MAX
Alarm, full
C
MAX
MIN
Pump control
Reserve pump
for draining
MAX
Device A
Device B
MIN
Draining with alarm full
MIN
C
MAX
MIN
Reserve pump
2CDC 252 018 F0215
2CDC 252 017 F0215
Alarm
MAX
Control pump
C
Control pump
C
Reserve pump
Device B
MIN
MIN
Filling with reserve pump
Device A
C
MAX
Control pump
2CDC 252 015 F0215
Control pump
C
2CDC 252 016 F0215
C
Pump control
Draining with reserve pump
Electrical connection
11
MAX
MIN
C MAX MIN
11
A1
14
A2
12 14
12
A2
A1–A2
Control supply voltage
11–12/14
1 c/o (SPDT) contact
C
Reference electrode
MAX
Maximum level electrode
MIN
Minimum level electrode
A1–A2
Control supply voltage 220-240 V AC
A3-A2
Control supply voltage 110-130 V AC
11 – 12/14
1 c/o (SPDT) contact
C
Reference electrode
MAX
Maximum level electrode
MIN
Minimum level electrode
2CDC 252 006 F0015
A1
C
A1
C
11
MAX
A3
MIN
C MAX MIN
11
A1 A3
14
A2
12 14
12
A2
2CDC 252 005 F0015
Connection diagram CM-ENS.11
Connection diagram CM-ENS.13
Data sheet | Liquid level monitoring relay CM-ENS.1x - 5
Function diagrams
A1-A2/A2-A3
Liquid level
max.
min.
2CDC 252 004 F0215
11-14
11-12
U: green LED
R: yellow LED
MIN/MAX: yellow LED
CM-ENS.1x
Technical data
Data at Ta = 25 °C and rated values, unless otherwise indicated
Input circuit
Type
CM-ENS.1x
Supply circuit
Rated control supply voltage Us
CM-ENS.11: A1-A2
24-240 V AC/DC
CM-ENS.13: A1-A2
220-240 V AC
CM-ENS.13: A3-A2
110-130 V AC
Rated control supply voltage Us tolerance
-15...+10 %
Rated frequency
50/60 Hz
Frequency range
47-63 Hz
Typical current / power consumption
24 V AC
25 mA / 0.6 W
110-130 V AC
20 mA / 2.6 VA
220-240 V AC
8.5 mA / 2.1 VA
24-240 V AC/DC
Power failure buffering time
Start-up time ts
min.
range 5-100 kΩ
11 mA / 2.6 VA
20 ms
max. 1.3 s
Measuring circuit
MAX-MIN-C
Sensor type
electrode
Monitoring functions
drain
Measuring principle
conductivity measurement
Number of electrodes
3
Response sensitivity
adjustable: 5-100 kΩ
Maximum electrode voltage
6 V AC
Maximum electrode current
Electrode supply line
1 mA
max. cable capacity
max. cable length
Max. measuring cycle
range 5-100 kΩ
10 nF
100 m
1000 ms
User interface
Indication of operational states
Control supply voltage
U
green LED
Output relay energized
R
yellow LED
MAX/MIN
yellow LED
Electrode / alarm status
6 - Liquid level monitoring relay CM-ENS.1x | Data sheet
Output circuits
Kind of output
11-12/14
relay, 1 c/o (SPDT) contact
Operating principle
open-circuit principle
Contact material
AgNi alloy, Cd free
Rated operational voltage Ue
250 V AC
Minimum switching voltage / Minimum switchting current
12 V / 10 mA
Maximum switchting voltage / Maximum switching current
See ‘Load limit curves’ on page <OV>
Rated operational current Ie
AC-12 (resistive) at 230 V
4A
AC-15 (inductive) at 230 V
3A
DC-12 (resistive) at 24 V
4A
DC-13 (inductive) at 24 V
2A
AC rating (UL 508)
Utilization category
B 300, pilot duty general purpose (250 V, 4 A, cos
ϕ 0.75)
(Control Circuit Rating Code)
max. rated operational voltage
max. continuous thermal current at B 300
max. making/breaking apparent power at B 300
Mechanical lifetime
300 V AC
5A
3600/360 VA
10 x 106 switching cycles
Electrical lifetime
AC-12, 230 V, 4 A
0.1 x 106 switching cycles
Maximum fuse rating to achieve
n/c contact
6 A fast-acting
short-circuit protection
n/o contact
10 A fast-acting
Conventional thermal current Ith
4A
General data
MTBF
on request
Duty time
100 %
Dimensions (W x H x D)
product dimensions
packaging dimensions
Weight
net weight
gross weight
22.5 x 85.6 x 103.7 mm (0.89 x 3.37 x 4.08 in)
30 x 97 x 109 mm (1.18 x 3.82 x 4.29 in)
Screw connection
Easy Connect Technology
technology
(push-in)
CM-ENS.11
0.124 kg (0.273 lb)
0.117 kg (0.258 lb)
CM-ENS.13
0.153 kg (0.337 lb)
0.145 kg (0.320 lb)
CM-ENS.11
0.148 kg (0.326 lb)
0.142 kg (0.313 lb)
CM-ENS.13
0.177 kg (0.390 lb)
0.170 kg (0.375 lb)
Mounting
DIN rail (IEC/EN 60715), snap-on mounting without any tool
Mounting position
any
CM-ENS.11: not necessary
Minimum distance to other units
CM-ENS.13: 10 mm if contact current > 2 A
Material of housing
Degree of protection
UL 94 V-0
housing
IP50
terminals
IP20
Electrical connection
Connecting capacity
Screw connection
technology
Easy Connect
Technology (push-in)
fine‑strand with(out)
1 x 0.5-2.5 mm²
2 x 0.5-1.5 mm²
wire end ferrule
(1 x 18-14 AWG)
(2 x 18-16 AWG)
2 x 0.5-1.5 mm²
(2 x 18-16 AWG)
rigid
1 x 0.5-4 mm²
2 x 0.5-1.5 mm²
(1 x 20-12 AWG)
(2 x 20-16 AWG)
2 x 0.5-2.5 mm²
(2 x 20-14 AWG)
Stripping length
8 mm (0.32 in)
Tightening torque
0.6 - 0.8 Nm
-
(7.08 lb.in)
Data sheet | Liquid level monitoring relay CM-ENS.1x - 7
Environmental data
operation -25...+60 °C (-13...+140 °F)
Ambient temperature ranges
storage -40...+85 °C (-40...+185 °F)
Damp heat, cyclic (IEC/EN 60068-2-30)
6 x 24 h cycle, 55 °C, 95 % RH
Climatic class (IEC/EN 60721-3-3)
3K5 (no condensation, no ice formation)
Vibration, sinusoidal
Class 2
Shock, half-sine
Class 2
Isolation data
Rated impulse withstand voltage Uimp
Rated insulation voltage Ui
Basic insulation
Protective separation
supply circuit / measuring circuit
4 kV
supply circuit / output circuits
4 kV
measuring circuit / output circuits
4 kV
output circuit 1 / output circuit 2
4 kV
supply circuit / measuring circuit
300 V
supply circuit / output circuits
300 V
measuring circuit / output circuits
300 V
output circuit 1 / output circuit 2
300 V
supply circuit / measuring circuit
250 V AC / 300 V DC
supply circuit / output circuits
250 V AC / 300 V DC
measuring circuit / output circuits
250 V AC / 300 V DC
output circuit 1 / output circuit 2
250 V AC / 300 V DC
supply circuit / measuring circuit
250 V AC / 300 V DC
supply circuit / output circuits
250 V AC / 300 V DC
measuring circuit / output circuits
250 V AC / 300 V DC
(IEC/EN 61140, EN 50178)
Pollution degree
3
Overvoltage category
III
Standards / Directives
Standards
IEC/EN 60947-5-1, IEC/EN 60255-27
Low Voltage Directive
2014/35/EU
EMC Directive
2014/30/EU
RoHS Directive
2011/65/EU
Electromagnetic compatibility
Interference immunity to
IEC/EN 61000-6-2, IEC/EN 60255-26
electrostatic discharge
IEC/EN 61000-4-2
Level 3 (6 kV / 8 kV)
radiated, radio-frequency,
IEC/EN 61000-4-3
Level 3 (10 V/m)
electrical fast transient / burst
IEC/EN 61000-4-4
Level 3, 2 KV / 5 kHz
surge
IEC/EN 61000-4-5
Level 3, installation class 3, supply circuit and measuring circuit
conducted disturbances, induced by
IEC/EN 61000-4-6
electromagnetic field
1 kV L-L, 2 kV L-earth
Level 3, 10 V
radio-frequency fields
voltage dips, short interruptions and
IEC/EN 61000-4-11
Class 3
voltage variations
Interference emission
IEC/EN 61000-6-3
high-frequency radiated
IEC/CISPR 22, EN 55022
Class A
high-frequency conducted
IEC/CISPR 22, EN 55022
Class A
8 - Liquid level monitoring relay CM-ENS.1x | Data sheet
Technical diagrams
Load limit curves
V
300
V
300
V 200
V 200
resistive load
resistive load
100
80
60
50
40
30
100
80
60
50
40
30
0.2
0.5
1
2
I
4
6
10
A
AC load (resistive)
10
0.1
0.2
0.5
1
2
I
4
6
10
A
2CDC 252 193 F0205
10
0.1
2CDC 252 194 F0205
20
20
Switching cycles
DC load (resistive)
1.0
0.9
250 V
resistive load
0.8
F
0.7
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
cos ϕ
Reduction factor F for inductive AC load
Switching current [A]
2CDC 252 148 F0206
0.5
2CDC 252 192 F0205
0.6
Contact life time / number of operations N
220 V 50 Hz 1 AC, 360 operations/h
Data sheet | Liquid level monitoring relay CM-ENS.1x - 9
Dimensions
in mm and inches
113.4 4.47”
105.9 4.17”
2CDC 252 009 F0011
85.6 3.37”
22.5 0.89”
103.7 4.08”
Accessories
in mm and inches
8 0.32”
4.8 0.19”
68 2.68”
11.5
0.453”
ADP.01 ‑ Adapter for screw mounting
MAR.12 ‑ Marker label for devices
with DIP switches
front to back
110.5 4.31”
COV.11 ‑ Sealable transparent cover
Further documentation
Document title
Document type
Document number
Electronic products and relays
Technical catalogue
2CDC 110 004 C02xx
Operating and installation instructions CM-ENS
Instruction manual
1SVC 730 680 M0000
You can find the documentation on the internet at www.abb.com/lowvoltage
-> Automation, control and protection -> Electronic relays and controls -> Measuring and monitoring relays.
CAD system files
You can find the CAD files for CAD systems at http://abb-control-products.partcommunity.com
-> Low Voltage Products & Systems -> Control Products -> Electronic Relays and Controls.
10 - Liquid level monitoring relay CM-ENS.1x | Data sheet
2CDC 252 010 F0011
19.9
0.783”
2CDC 252 020 F0011
4T22
7.85
22.2
0.874”
0.309”
60 2.362”
70 2.756”
2CDC 252 008 F0010
62.5 2.461”
10
0.394”
20
0.787”
6.5
0.256”
22.5 0.89”
Contact us
Document number 2CDC 112 228 D0201 (07/2016)
ABB STOTZ-KONTAKT GmbH
P. O. Box 10 16 80
69006 Heidelberg, Germany
Phone: +49 (0) 6221 7 01-0
Fax: +49 (0) 6221 7 01-13 25
E-mail: info.desto@de.abb.com
You can find the address of your
local sales organisation on the
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-> Low Voltage Products and Systems
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