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 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 E2K-L 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 0.6 to 5 mm 0.3 to 3 mm (reference value only; varies 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 2 Shock resistance 500 m/s 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 6 6 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 ipe diameter: 8 mm; Liquid: Distilled water 4 Pipe diameter: 12 mm; Liquid: Distilled water 4 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 Black Main * E2K-L13MC1 Operates Load NO circuit E2K-L26MC1 (brown-black) Releases ON Operation indicator Blue (orange) OFF 0V * 100 mA max. (load current) Operation 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 the setting position Sensor 1 Turn the sensitivity adjuster Not lit clockwise using a screwdriver Level of until the indicator lights. liquid surface Turn the sensitivity adjuster Setting position (notch) counterclockwise using a 2 screwdriver until the indicator 1 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 Change in detection level (mm) Change in detection level (mm) E2K-L 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 adjuster Operation indicator A Level of Object on Opposite Side liquid surface Setting position B (notch) Binding bands C 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 545 25 E2K-L26MC1 0 40 Binding bands Slip-prevention tubes Top View Mutual Interference Wiring Considerations When installing 2 or more Sensors in series, in parallel, or fac- ing each other, be sure that they are separated by at least the Power Supply  If separate power supplies are used for Sensor and load, be distances shown below. 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 use it in locations where it may have a direct contact with F 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 range, do not subject it to sudden changes in temperature Mutual Interference (Unit: mm) because this will shorten the service life. Shape Length D (see note) E F E2K-L13MC1 25 10 10 Miscellaneous E2K-L26MC1 30 * 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 electric constant of the liquid is low, the detection level of the Sensor first. 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 4.5 5 1 Sensitivity adjuster Sensing surface 3.5 6 6.5 2.9-dia. three conductors vinyl-insulated round cable 2 (cross-sectional area of conductors: 0.14 mm ; insulation diameter: 0.9 mm) Standard length: 2 m E2K-L26MC1 20 5 R13 R17.5 Mounting holes 33 Operation indicator 6 4.5 11 1.5 (orange) Sensitivity adjuster 2 34 32 24 3 1 Sensing surface 3.5 6.5 6 2.9-dia. three conductors vinyl-insulated round cable 2 (cross-sectional area of conductors:0.14 mm ; insulation diameter: 0.9 mm) Standard length: 2 m E2K-L D-207 E2K-L 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