LLC4 Series - Liquid Level Controller

Series: LLC4
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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 LLC4 combines resistance sensing circuitry with solid-state timing to provide single probe level maintenance. On adjustable units, the sensitivity adjustment allows accurate level sensing while ignoring foaming agents and floating debris. Isolated 12VAC is provided at the probe to prevent electrolysis. A trickle current of less than 1mA determines the presence or absence of conductive liquid between the probe and common. The LLC4 Series can be used with many types of low voltage (resistance changing) transducers to perform other control functions like temperature limit control, photo limit control, condensation sensing, and ice sensing.


Operation
Drain (Pump-Down Mode): When the liquid level rises and touches the probe, the time delay begins. This time delay prevents rapid cycling of the output relay and its load. At the end of the time delay, the output relay energize and remain energized until the liquid level falls below the probe level. The output relay de-energize and remain de-energized until the liquid rises and touches the probe.
Fill (Pump Up Mode): When the liquid level falls below the probe, the time delay begins. This time delay prevents rapid cycling of the output relay and its load. At the end of the time delay, the output relay energize and remain energized until the liquid level rises and touches the probe. The output relay then de-energize and remain de-energized until the liquid level again falls below the probe level.

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)		Output
Form		Time Delay RangeTermination 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)StockSamplesCompare
LLC42A10A24 VacIsolated SPDT10 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.35≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC42A1A24 VacIsolated SPDT1 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.35≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC42B15A24 VacIsolated SPDT15 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.35≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44A10A120 VacIsolated SPDT10 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44A15A120VACIsolated SPDT15s fixedOctal 8-pin plug-inPlug-in socket2.91 x 2.39 x 1.78 in. (73.9 x 60.7 x 45.2mm)≅6.0oz (170g)ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling-0.3≥1500V RMS between input output and probe4A resistive @ 240VAC and 28VDC; 1/10hp @ 240VACElectromechanical relay1K ±500 Ω at low end; 250K ±25% at high endAdjustable to 250kΩ
LLC44A1A120 VacIsolated SPDT1 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44A2A120 VacIsolated SPDT2 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44A4A120 VacIsolated SPDT4 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44A5A120 VacIsolated SPDT5 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44A60A120 VacIsolated SPDT60 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44B1A120 VacIsolated SPDT1 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44B20A120 VacIsolated SPDT20 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44B2A120 VacIsolated SPDT2 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44B30A120 VacIsolated SPDT30 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44B4A120 VacIsolated SPDT4 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44B5A120 VacIsolated SPDT5 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay1 kΩ ±500; at low end; 250 kΩ ±25% at high endAdjustable to 250CheckOrder
LLC44B5F100120 VacIsolated SPDT5 s fixedOctal 8-pin plug-inPlug-in socket2.91 H x 2.39 W x 1.78 D in. (73.9 x 60.7 x 45.2 mm)0 KgON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling50 / 60-0.3≥1500 Vrms between input; output; and probe4 A resistive @ 240 Vac and 28 Vdc; 1/10 hp @ 240 VacElectromechanical relay±10% or 500 Ω whichever is greater100 fixedCheckOrder
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  • Showing 2 items
    • LLP
      The LLP-24 is a threaded stainless steel probe measuring 24 in. (61 cm) long. Designed for use with ...More

    • Dimensions: 24 L in.

    • Weight (lbs/g): 0 Kg

    • Sensor Type: Liquid level probe

    • PHST
      The PHST-38QTN is a probe holder designed for use with all conductive liquid level controls. Compose...More

    • Weight (lbs/g): 0 Kg

    • Sensor Type: Probe holder for liquid level probe for use up to 240 PSI steam pressure

    • Information Not Available