LLC2 Series - Open Board Liquid Level Control

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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The LLC2 Series is a dual-probe conductive liquid level control designed for OEM equipment and commercial appliance applications. Models are available for fill or drain operation. Transformer isolated 12VAC is provided at the probes to prevent electrolysis. A trickle current of less than 1mA determines the presence or absence of liquid between the probes and common. On adjustable units, the sensitivity adjustment allows accurate level sensing while ignoring foaming agents and floating debris. The LLC2 Series printed circuit board is conformal coated to resist moisture and corrosion.


Operation
Drain (Pump-Down Mode): When the liquid level rises and touches the high probe, the output relay energizes and remains energized until the liquid level falls below the low probe. The output relay then de-energizes and remains de-energized until the liquid again touches the high probe.
Fill (Pump-Up Mode): When the liquid level falls below the low probe, the output relay energizes and remains energized until the liquid level rises and touches the high probe. The output relay then de-energizes and remains de-energized until the liquid level again falls below the low probe.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Output
Form
Termination TypeMounting MethodDimensionsWeight (lbs/g)Control TypeInput AC Line Frequency (Hz)Input Tolerance (%)Isolation Voltage (V)Output Load Rating (VA)Output TypeSense Resistance ToleranceSense Resistance (Ohms)Sense VoltageStockCompare
LLC24A2AN120 VacIsolated SPDTTerminal blocks for up to #14 AWG (2.5 mm²) wireSurface mount to probe common with two or four #6 (M3.5 x 0.6) screws4 H x 3 W x 2 D in. (101.6 x 76.2 x 50.8 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.3≥1500 Vrms between input; output; and probe10 A resistive @ 120/240 Vac and 28 Vdc; 1/3 hp @ 120/240 VacElectromechanical relayGuaranteed rangeAdjustable to 10012 Vac at probe terminalsCheck
LLC24A2F50N120 VacIsolated SPDTTerminal blocks for up to #14 AWG (2.5 mm²) wireSurface mount to probe common with two or four #6 (M3.5 x 0.6) screws4 H x 3 W x 2 D in. (101.6 x 76.2 x 50.8 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.3≥1500 Vrms between input; output; and probe10 A resistive @ 120/240 Vac and 28 Vdc; 1/3 hp @ 120/240 VacElectromechanical relay±10%50 fixed12 Vac at probe terminalsCheck
LLC24B1AC120 VacIsolated SPDT0.25 in. (6.3 mm) male quick connect terminalsSurface mount to probe common with two or four #6 (M3.5 x 0.6) screws4 H x 3 W x 2 D in. (101.6 x 76.2 x 50.8 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.3≥1500 Vrms between input; output; and probe10 A resistive @ 120/240 Vac and 28 Vdc; 1/3 hp @ 120/240 VacElectromechanical relayGuaranteed rangeAdjustable to 10012 Vac at probe terminalsCheck
LLC24B2F50N120 VacIsolated SPDTTerminal blocks for up to #14 AWG (2.5 mm²) wireSurface mount to probe common with two or four #6 (M3.5 x 0.6) screws4 H x 3 W x 2 D in. (101.6 x 76.2 x 50.8 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.3≥1500 Vrms between input; output; and probe10 A resistive @ 120/240 Vac and 28 Vdc; 1/3 hp @ 120/240 VacElectromechanical relay±10%50 fixed12 Vac at probe terminalsCheck
LLC26A1F25C230 VacIsolated SPDT0.25 in. (6.3 mm) male quick connect terminalsSurface mount to probe common with two or four #6 (M3.5 x 0.6) screws4 H x 3 W x 2 D in. (101.6 x 76.2 x 50.8 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.3≥1500 Vrms between input; output; and probe10 A resistive @ 120/240 Vac and 28 Vdc; 1/3 hp @ 120/240 VacElectromechanical relay±10%25 fixed12 Vac at probe terminalsCheck
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