E2KL13MC1

- Liquid Level Sensor **E2K-L** 

- o ~~e~~ • Installation on pipes. • Sensing by means electrostatic capacity and is not a | 

- 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** 

## Ordering Information 

Sensor type Applicable pipe diameters Shape Output form Model **8 to 11 mm dia. E2K-L13MC1 Electrostatic** ~~he~~ NPN open-collector outNO **capacity method** put **12 to 26 mm dia. E2K-L26MC1** ~~ko~~ 

**E2K-L** 

D-203 

## Rating/Performance 

|Item|Model|Model|E2K-L13MC1|E2K-L26MC1|
|---|---|---|---|---|
|Applicable pipes|Material||Non-metal||
||Size|External<br>diameter|8 to 11 mm dia.|12 to 26 mm dia.|
|||Wall<br>thickness|1 mm max.|1.5 mm max.|
|Sensingobject|||Liquid(see note)||
|Repetition precision|||±0.2 mm max.||
|Response difference|||0.6 to 5 mm|0.3 to 3 mm|
|(reference value only; varies<br>with pipe size and solution)|||||
|Supply voltage<br>(operatingvoltage range)|||12 to 24 VDC, 10% max. ripple (10.8 to 30 VDC)||
|Current consumption|||12 mA max.||
|Control output|Switching<br>capacity||100 mA max.||
||Residual<br>voltage||1 V max. (under load current of 100 mA with cable length of 2 m)||
|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 icingor condensation)||
|Ambient humidity|||Operating/storage: 25% to 85% (with no condensation)||
|Temperature influence|||In the range 0 to 55°C: Detection level at 23°C 4 mm (with distilled water or 20 % salt water con-<br>centration)<br>(±6 mm with E2K-L13MC1 for distilled water in pipe of 8 mm diameter)||
|Voltage influence|||At the rated power supplyvoltage ±10%: Detection level at rated supplyvoltage ±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/s2for 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. 70g||
|Material|Case, cover||Heat-resistant ABS resin||
||Cable clamp||NBR||
|Accessories|||2 bindingbands, 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. 

Capacitive Sensors 

D-204 

Characteristic data (typical) 

## Influence of Temperature on Detection Level 

## **E2K-L13MC1** 

## **E2K-L26MC1** 

**==> picture [512 x 282] intentionally omitted <==**

**----- Start of picture text -----**<br>
6 6<br>Pipe diameter: 11 mm; Liquid: Distilled water Pipe diameter: 26 mm; Liquid: Distilled water<br>Pipe diameter: 11 mm; Liquid: Salt water Pipe diameter: 26 mm; Liquid: Salt water<br>4 ipe diameter: 8 mm; Liquid: Distilled water 4 Pipe diameter: 12 mm; Liquid: Distilled water<br>Pipe diameter: 8 mm; Liquid: Salt water Pipe diameter: 12 mm; Liquid: Salt water<br>2 2<br>10 20 0 10<br>0 -10 0 30 40 50 60˚ 0 -10 20 30 40 50 60<br>Temperature (C ) ˚<br>Temperature (C )<br>-2 -2<br>-4 -4<br>-6 -6<br>Output Circuit Diagram<br>Output form Model Timing chart Output circuit<br>Brown<br>+V<br>Yes<br>Liquid surface No Load<br>NO E2K-L13MC1E2K-L26MC1 (brown-black)Load ReleasesOperates Maincircuit Black*<br>Operation indicator ON Blue<br>(orange) OFF 0V<br>* 100 mA max. (load current)<br>Change in detection level (mm) Change in detection level (mm)<br>**----- End of picture text -----**<br>


## Operation 

## Sensitivity adjustment 

1. Install the Sensor with the setting position (notch) in line with the liquid level to be detected. 

**==> picture [111 x 116] intentionally omitted <==**

**----- Start of picture text -----**<br>
Pipe<br>Sensor<br>Level of<br>liquid surface<br>Setting position<br>(notch)<br>**----- End of picture text -----**<br>


2. After Sensor installation adjust the detecting sensitivity using the (12-step) sensitivity adjuster in the way shown below. 

**==> picture [243 x 162] intentionally omitted <==**

**----- Start of picture text -----**<br>
Status of the<br>indicator when<br>the liquid level  Sensitvity adjuster Adjustment procedure<br>is aligned with<br>the setting position<br>1 Turn the sensitivity adjuster<br>Not lit clockwise using a screwdriver<br>until the indicator lights.<br>Turn the sensitivity adjuster<br>2 counterclockwise using a<br>1 screwdriver until the indicator<br>Lit turns OFF. Then, turn the<br>sensitivity adjuster clockwise<br>until the indicator lights up<br>again.<br>**----- End of picture text -----**<br>


- 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. 

**==> picture [108 x 111] intentionally omitted <==**

**----- Start of picture text -----**<br>
2. Then set the upper limit.<br>1. First set the lower limit.<br>**----- End of picture text -----**<br>


**E2K-L** 

D-205 

Precautions 

## Correct Use 

## Design 

## Influence of Surrounding Objects 

Performance may be adversely affected by conductive objects (e.g., metals) in the vicinity of the Sensor. Ensure that any conductive objects are separated from the Sensor and set at a minimum distance as shown below. 

**==> picture [232 x 191] intentionally omitted <==**

**----- Start of picture text -----**<br>
Pipe Sensor<br>A<br>Object on Opposite Side<br>B<br>C<br>Object on One Side Objects on Both Sides<br>**----- End of picture text -----**<br>


## Influence of Surrounding Objects (Units: mm) 

|Shape<br>Length|A|B|C|
|---|---|---|---|
|E2K-L13MC1|25|5|45|
|E2K-L26MC1||0|40|



## Mutual Interference 

When installing 2 or more Sensors in series, in parallel, or facing each other, be sure that they are separated by at least the distances shown below. 

**==> picture [238 x 133] intentionally omitted <==**

**----- Start of picture text -----**<br>
D<br>F<br>E<br>Installed in  Installed in Parallel Installed in Facing<br>Series Sides Each Other<br>**----- End of picture text -----**<br>


Mutual Interference (Unit: mm) 

|Shape<br>Length|D (see note)|E|F|
|---|---|---|---|
|E2K-L13MC1|10|10|25|
|E2K-L26MC1|||30|



* The detection level for the top Sensor may change when the detection level for the bottom Sensor is set. Be sure to set the detection level for the bottom Sensor first. 

## Installation 

## Sensor installation 

Attach the Sensor securely to the pipe using the 2 binding bands and the 4 nonskid tubes provided (2 tubes per band) in the way 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 Sensor in parallel. 

**==> picture [232 x 251] intentionally omitted <==**

**----- Start of picture text -----**<br>
Pipe<br>Sensitivity<br>Sensor Operation indicator adjuster<br>Level of<br>liquid surface<br>Setting position<br>(notch)<br>Binding bands<br>Slip-prevention tubes<br>Side View Front View<br>Pipe Sensor<br>Binding bands<br>Slip-prevention tubes<br>Top View<br>**----- End of picture text -----**<br>


## Wiring Considerations 

## Power Supply 

• 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. 

## ● Operating Environment Ambient Conditions 

• Although this product has waterproof specifications, do not use it in locations where it may have a direct contact with liquids (e.g., water or cutting oil). Such locations can interfere with the electrostatic capacity method used by the Sensor. 

• Even if the Sensor is used within the specified temperature range, do not subject it to sudden changes in temperature because this will shorten the service life. 

## Miscellaneous 

Drift may occur when the power supply is turned ON. If the dielectric constant of the liquid is low, the detection level of the liquid may be 2 to 3 mm higher than the set level for approximately 20 minutes after power is turned ON. 

Capacitive Sensors 

D-206 

Dimensions (Unit: mm) 

## **E2K-L13MC1** 

**==> picture [372 x 198] intentionally omitted <==**

**----- Start of picture text -----**<br>
20<br>5<br>R6.5 R17.5<br>24 Mounting holes<br>11 1.5<br>Operation indicator (orange)<br>6<br>43 41 33<br>4 5 4.5<br>1<br>Sensitivity adjuster<br>Sensing surface<br>3.5<br>6<br>6.5<br>2.9-dia. three conductors vinyl-insulated round cable<br>(cross-sectional area of conductors: 0.14 mm [2] ;<br>insulation diameter: 0.9 mm) Standard length: 2 m<br>**----- End of picture text -----**<br>


**E2K-L26MC1** 

**==> picture [232 x 158] intentionally omitted <==**

**----- Start of picture text -----**<br>
20<br>5<br>R13 R17.5<br>33<br>11<br>34 32 24<br>? a<br>**----- End of picture text -----**<br>


**==> picture [351 x 194] intentionally omitted <==**

**----- Start of picture text -----**<br>
20<br>5<br>R13 R17.5<br>33 Mounting holes<br>11 1.5 Operation indicator(orange) 6 4.5 Sensitivity adjuster<br>2<br>34 32 24 3<br>1<br>a<br>Sensing surface<br>3.5<br>6.5 6<br>2.9-dia. three conductors vinyl-insulated round cable<br>(cross-sectional area of conductors:0.14 mm [2] ;<br>insulation diameter: 0.9 mm) Standard length: 2 m<br>**----- End of picture text -----**<br>


**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. 

Capacitive Sensors 

D-208