Omron E2K-L User manual

1
CSM_E2K-L_DS_E_4_1
Liquid Level Sensor
E2K-L
Liquid Level Sensor That Is
Unaffected by the Color of the Pipe or
Liquid
• Mount to bypass pipes.
• Fit a wide range of pipe diameters: 8 to 11 mm or 12 to 26 mm
• Built-in Amplifiers to save space.
Be sure to read Safety Precautions on
page 3.
Ordering Information
Sensors [Refer to Dimensions on page 4.]
Sensing method Applicable pipe diameters Appearance Output configuration/Operation mode Model
Capacitive
8 to 11 mm
NPN open-collector output NO
E2K-L13MC1 2M
12 to 26 mm E2K-L26MC1 2M

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2
Ratings and Specifications
* Stable detection will not be possible in the following cases. Confirm detection capability with the Sensor installed before actual application.
1. If the specific inductive capacity or the specific electric conductivity of the liquid is too low, the liquid position may not be detected since this sensor is a capacitive
sensor.
2. If the quantity of liquid is too low or the change in quantity is too low in comparison to the change in liquid level because the pipe is too thin or the walls of the pipe
are too thick
3. If there is a viscous film on the inner pipe wall, large quantities of foam or air bubbles, or excessive buildup of dirt on the inner pipe wall
Engineering Data (Typical)
Item Model E2K-L13MC1 E2K-L26MC1
Applicable
pipes
Materials Non-metal
Size
Diame-
ter 8 to 11 mm 12 to 26 mm
Thick-
ness 1 mm max. 1.5 mm max.
Detectable object Liquid *
Repeat accuracy ±0.2 mm max.
Differential travel
(Reference value, varies with pipe
size and liquid.)
0.6 to 5 mm 0.3 to 3 mm
Power supply voltage
(operating voltage range) 12 to 24 VDC (10.8 to 30 VDC), ripple (p-p): 10% max.
Current consumption 12 mA max.
Control output Load current 100 mA max.
Residual voltage 1 V max. (Load current: 100 mA, Cable length: 2 m)
Sensing liquid position Indented mark position (For details, refer to Technical Guide (Operational version).)
Indicators Detection indicator (orange)
Ambient temperature range Operating: 0 to 55°C (with no icing or condensation), Storage: −10 to 65°C (with no icing or condensation)
Ambient humidity range Operating/Storage: 25% to 85% (with no condensation)
Temperature influence
±4 mm of detection level at 23°C in the temperature range of 0 to 55°C (with pure water or 20% saline
solution)
(±6 mm for E2K-L13MC1 with pure water and a pipe diameter of 8 mm)
Voltage influence ±0.5 mm of detection level at the rated voltage in rated voltage ±10% range
Insulation resistance 50 MΩmin. (at 500 VDC) between current-carrying parts and case
Dielectric strength 500 VAC, 50/60 Hz for 1 min between current-carrying parts and case
Vibration resistance Destruction: 10 to 55 Hz, 1.5-mm double amplitude for 2 hours each in X, Y, and Z directions
Shock resistance Destruction: 500 m/s23 times each in X, Y, and Z directions
Degree of protection IP66 (IEC)
Connection method Pre-wired Models (Standard cable length: 2 m)
Weight (packed state) Approx. 70 g
Materials Case, Cover Heat-resistant ABS
Cable clamp NBR
Accessories Two bands, Four slip-proof tubes, Instruction manual
Influence of Temperature and Sensing Liquid Level
E2K-L13MC1 E2K-L26MC1
6
4
2
0
−2
−4
−6
30
20
0-10
10
605040
Pipe diameter: 11, Liquid: Pure water
Pipe diameter: 11, Liquid: Saline solution
Pipe diameter: 8, Liquid: Pure water
Pipe diameter: 8, Liquid: Saline solution
Temperature (°C)
Change in sensing liquid level (mm)
010
−10
6
4
2
0
−2
−4
−6
6050403020
Pipe diameter: 26, Liquid: Pure water
Pipe diameter: 26, Liquid: Saline solution
Pipe diameter: 12, Liquid: Pure water
Pipe diameter: 12, Liquid: Saline solution
Temperature (°C)
Change in sensing liquid level (mm)

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I/O Circuit Diagrams
Safety Precautions
Refer to Warranty and Limitations of Liability.
This product is not designed or rated for ensuring
safety of persons either directly or indirectly.
Do not use it for such purposes.
Do not use this product under ambient conditions that exceed the
ratings.
●Design
Influence of Surrounding Objects
When mounting the Sensor, maintain at least the distances in the
following diagrams from surrounding metal objects or other
conductors to prevent the Sensor from being affected by objects other
than the sensing object.
Influence of Surrounding Objects (Unit: mm)
Mutual Interference
When installing Sensors in series, in parallel, or face-to-face, ensure
that the minimum distances given in the following table are
maintained.
Mutual Interference (Unit: mm)
* Also, always adjust the bottom Sensor first because adjusting the bottom
Sensor may affect the detection level of the top Sensor.
●Mounting
Mounting
Mount the Sensor securely to the pipe using the enclosed two bands
and four slip-proof tubes (two tubes used for each band) as shown in
the following diagram.
When mounting the Sensor, be sure the entire Sensor is tight against
the pipe along the sensing surface.
Operation mode Model Timing chart Output circuit
NO E2K-L13MC1
E2K-L26MC1
WARNING
Present
None
Operate
Reset
ON
OFF
Load (between brown
and black leads)
Detection indicator
(orange)
Liquid level
0 V
+V
*
Brown
Black
* Load current: 100 mA max.
Blue
Main
circuit
Load
Precautions for Correct Use
Model
Distance A B C
E2K-L13MC1 25 545
E2K-L26MC1 040
B
C
A
SensorPipe
Face-to-face
On One Side On Both Sides
D
E
F
In Parallel Face-to-faceIn Series
Model
Distance D*E F
E2K-L13MC1 10 10 25
E2K-L26MC1 30
Sensor
Liquid level
Set
position
(indented
mark)
Pipe
Slip-proof tubes
Slip-proof tubes
Bands
Bands
Detection
indicator
Sensitivity
adjuster
SensorPipe
Side View Front View
To
p
View

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●Wiring
Power Supply
•If the load and Sensor are connected to different power supplies,
always turn ON the Sensor power first.
•Switching noise can cause operating mistakes if a commercial
switching regulator is used. When using a switching regulator,
always ground the frame ground terminal and the ground terminal.
●Operating Environment
Ambient Atmosphere
•Although the Sensor is water resistance, it is a capacitive sensor
and should not be used where it will come into direct contact with
liquids, such as water or cutting oil.
•The life of the Sensor will be shorten by rapid changes in
temperature even within the ambient operating temperature range.
Do not use the Sensor in locations subject to rapid temperature
changes.
●Miscellaneous
Drift will occur when the power supply is turned ON. If the specific
inductive capacity of the sensing liquid is low, the detection level may
increase by 2 to 3 mm during the 20 minutes required from the time
the power supply is turned ON until operation stabilizes.
Dimensions (Unit: mm)
Tolerance class IT16 applies to dimensions in this data sheet unless otherwise specified.
E2K-L13MC1
R17.5
11
24
R6.5
334143
5
20
45
1.5
3.5
1
6.5
6
4.5
6
Sensitivity
adjuster
Detection
indicator
(orange)
Mounting holes
* 2.9-dia. vinyl-insulated round cable with 3 conductors (Conductor cross
section: 0.14 mm2, Insulator diameter: 0.9 mm), Standard length: 2 m
Sensing surface
E2K-L26MC1
5
R17.5
243234
11
33
R13
20
2
3
3.5
1
6.5 6
1.5 4.56
Detection
indicator
(orange)
Sensitivity
adjuster
Mounting holes
* 2.9-dia. vinyl-insulated round cable with 3
conductors (Conductor cross section: 0.14 mm2,
Insulator diameter: 0.9 mm), Standard length: 2 m
Sensing surface