Liquid Level Sensor

E2K-L
• Installation on pipes.
• Sensing by means electrostatic capacity and is not
influenced by the color of the pipe or liquid.
• Available in 8 to 11 mm dia. and 12 to 26 mm dia.
models to enable sensing for a wide range of pipe
diameters.
• Built-in amplifier for space-saving.

Applications
Liquid surface level detection

E2K-L
Ordering Information
Sensor type Applicable pipe diameters Shape Output form Model

8 to 11 mm dia. E2K-L13MC1

Electrostatic NPN open-collector out-

NO
capacity method put

12 to 26 mm dia. E2K-L26MC1

E2K-L D-203
Rating/Performance
Item Model E2K-L13MC1 E2K-L26MC1
Material Non-metal
External
8 to 11 mm dia. 12 to 26 mm dia.
Applicable pipes diameter
Size
Wall
1 mm max. 1.5 mm max.
thickness
Sensing object Liquid (see note)
Repetition precision ±0.2 mm max.
Response difference
(reference value only; varies 0.6 to 5 mm 0.3 to 3 mm
with pipe size and solution)
Supply voltage
12 to 24 VDC, 10% max. ripple (10.8 to 30 VDC)
(operating voltage range)
Current consumption 12 mA max.
Switching
100 mA max.
capacity
Control output
Residual
1 V max. (under load current of 100 mA with cable length of 2 m)
voltage
Detection position of liquid surface Notch position (For details, refer to Sensitivity Adjustment on next page.)
Indicator lamp Operation indicator (orange)
Ambient temperature Operating: 0 to 55°C; Storage: -10 to 65°C (with no icing or condensation)
Ambient humidity Operating/storage: 25% to 85% (with no condensation)
In the range 0 to 55°C: Detection level at 23°C 4 mm (with distilled water or 20 % salt water con-
Temperature influence centration)
(±6 mm with E2K-L13MC1 for distilled water in pipe of 8 mm diameter)
Voltage influence At the rated power supply voltage ±10%: Detection level at rated supply voltage ±0.5 mm
Insulation resistance 50 M min. (at 500 VDC) between energized parts and case
Dielectric strength 500 VAC 50/60 Hz for 1 min between energized part and case
Vibration resistance 10 to 55 Hz, 1.5 mm double amplitude for 2 hours each in X, Y, and Z directions
Shock resistance 500 m/s2 for 3 times each in X, Y, and Z directions
Protective structure IEC 60529 IP66
Connection method Pre-wired models (standard length: 2 m)
Weight (Packed state) Approx. 70 g
Case, cover Heat-resistant ABS resin
Material
Cable clamp NBR
Accessories 2 binding bands, 4 nonskid tubes, instruction manual
Note: In the following cases, stable detection may not be possible and ensure to confirm correct operation in the actual installation before use.
1 . If the dielectric constant or conductivity of the liquid is low.
2 . If the capacity of the liquid is small, or if the pipe diameter is so small or the pipe walls are so thick that the amount by which the capacity changes relating to
the liquid level is small.
3 . In case of an increased gassing or a highly viscous liquid firm residue on the inside walls of the pipe, or a dirt clogging on the inner or outer walls of the pipe.

D-204 Capacitive Sensors

Characteristic data (typical)
Influence of Temperature on Detection Level
E2K-L13MC1 E2K-L26MC1
Change in detection level (mm)

6 6

Change in detection level (mm)

Pipe diameter: 11 mm; Liquid: Distilled water Pipe diameter: 26 mm; Liquid: Distilled water
Pipe diameter: 11 mm; Liquid: Salt water Pipe diameter: 26 mm; Liquid: Salt water
4 ipe diameter: 8 mm; Liquid: Distilled water 4 Pipe diameter: 12 mm; Liquid: Distilled water
Pipe diameter: 8 mm; Liquid: Salt water Pipe diameter: 12 mm; Liquid: Salt water

2 2

10 20 0 10
0 0
-10 0 30 40 50 60 -10 20 30 40 50 60
Temperature (C˚) Temperature (C˚)
-2 -2

-4 -4

-6 -6

Output Circuit Diagram

Output form Model Timing chart Output circuit

Brown
+V
Yes
Liquid surface Load
No
Main Black *
E2K-L13MC1 Load Operates
NO E2K-L26MC1 (brown-black)
circuit
Releases
Operation indicator ON
Blue
(orange) OFF 0V

* 100 mA max. (load current)

Operation

E2K-L
Sensitivity adjustment
1. Install the Sensor with the setting position (notch) in line 2. After Sensor installation adjust the detecting sensitivity using
with the liquid level to be detected. the (12-step) sensitivity adjuster in the way shown below.
Status of the
Pipe
indicator when
the liquid level Sensitvity adjuster Adjustment procedure
is aligned with
Sensor the setting position

1
Turn the sensitivity adjuster
Not lit clockwise using a screwdriver
Level of until the indicator lights.
liquid surface

Setting position Turn the sensitivity adjuster

(notch) counterclockwise using a
2
1
screwdriver until the indicator
Lit turns OFF. Then, turn the
sensitivity adjuster clockwise
until the indicator lights up
again.
Note: 1 . During sensitivity adjustment do not put your hand on the Sensor and
make sure that the cable is properly secured. Failure to observe these
points may affect the detection level.
2 . When using more than one Sensor (e.g., to detect for upper and lower
limits), adjust the sensitivity of the Sensors in order starting from the
bottom. Adjusting the sensitivity of a Sensor may affect the detection
level of the Sensor above it.

2. Then set the upper limit.

1. First set the lower limit.

E2K-L D-205
Precautions

Correct Use
Design Installation
Influence of Surrounding Objects Sensor installation
Performance may be adversely affected by conductive ob- Attach the Sensor securely to the pipe using the 2 binding
jects (e.g., metals) in the vicinity of the Sensor. Ensure that bands and the 4 nonskid tubes provided (2 tubes per band) in
any conductive objects are separated from the Sensor and the way shown below.
set at a minimum distance as shown below. Install the Sensor in such manner that the pipe is in contact
with the entire sensing face of the Sensor with the pipe and
Pipe Sensor
Sensor in parallel.

Pipe

Sensitivity
Sensor Operation indicator adjuster

A
Object on Opposite Side Level of
liquid surface

Setting position
B
(notch)

C Binding bands
Slip-prevention tubes

Side View Front View

Pipe Sensor
Object on One Side Objects on Both Sides

Influence of Surrounding Objects (Units: mm)

Shape Length A B C
E2K-L13MC1 5 45
25
E2K-L26MC1 0 40 Binding bands
Slip-prevention tubes

Mutual Interference Top View

When installing 2 or more Sensors in series, in parallel, or fac- Wiring Considerations

ing each other, be sure that they are separated by at least the Power Supply
distances shown below. • If separate power supplies are used for Sensor and load, be
sure to turn on the Sensor power supply first.
• If a commercially available switching regulator is used, the
Sensor may malfunction because of switching noise. Connect
the frame ground and ground terminals to ground.

D ● Operating Environment
Ambient Conditions
• Although this product has waterproof specifications, do not
F
use it in locations where it may have a direct contact with
E liquids (e.g., water or cutting oil). Such locations can interfere
Installed in Installed in Parallel Installed in Facing with the electrostatic capacity method used by the Sensor.
Series Sides Each Other
• Even if the Sensor is used within the specified temperature
Mutual Interference (Unit: mm) range, do not subject it to sudden changes in temperature
Shape Length D (see note) E F
because this will shorten the service life.
E2K-L13MC1 25
10 10
E2K-L26MC1 30 Miscellaneous
* The detection level for the top Sensor may change when the detection level Drift may occur when the power supply is turned ON. If the di-
for the bottom Sensor is set. Be sure to set the detection level for the bottom
Sensor first.
electric constant of the liquid is low, the detection level of the
liquid may be 2 to 3 mm higher than the set level for approxi-
mately 20 minutes after power is turned ON.

D-206 Capacitive Sensors

Dimensions (Unit: mm)

E2K-L13MC1

20

5
R6.5 R17.5

24
Mounting holes
11 1.5

Operation indicator (orange)

6
43 41 33
4 5 4.5

1
Sensitivity adjuster
Sensing surface

3.5
6
6.5
2.9-dia. three conductors vinyl-insulated round cable
(cross-sectional area of conductors: 0.14 mm2;
insulation diameter: 0.9 mm) Standard length: 2 m

E2K-L26MC1

20

E2K-L
R13 R17.5

33 Mounting holes
Operation indicator 6 4.5
11 1.5 (orange) Sensitivity adjuster

2
34 32 24
3

Sensing surface
3.5

6.5 6

2.9-dia. three conductors vinyl-insulated round cable

(cross-sectional area of conductors:0.14 mm2;
insulation diameter: 0.9 mm) Standard length: 2 m

E2K-L D-207
 ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.

Cat. No. D094-E2-01-X In the interest of product improvement, specifications are subject to change without notice.

D-208 Capacitive Sensors

Mouser Electronics

Authorized Distributor

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Omron:
E2K-L13MC1 E2K-L26MC1