LLC Series – Liquid Level Controls Series - Littelfuse LLC Liquid Level Controls Provide Superior Protection

Series: LLC Series – Liquid Level Controls
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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 LLC series provides dual-probe conductive liquid level control in a convenient, octal plug-in package. This unit is used to control liquid pumping operations in pump-up or pump-down applications. Models are available for fixed-fill or drain operation. Isolated, pulsed dc voltage on the probes prevents electrolytic plating. Less than 1 mA of current is set to sense the presence of conductive liquid between the probes and common. On adjustable units, the sensitivity adjustment eliminates false tripping caused by floating debris and foaming agents.

Operation
Drain (pump-down mode): When the liquid level rises and touches the high-level probe, the output relay and LED energize and remain energized until the liquid level falls below the low-level probe. The output relay and LED de-energize and remain de-energized until the liquid rises and touches the high-level probe.

Fill (pump-up mode): When the liquid level falls below the low-level probe, the output relay and LED energize and remain energized until the liquid level rises and touches the high-level probe. The output relay and LED de-energize and remain de-energized until the liquid level again falls below the low-level probe.

Features

  • Unique probe protection logic
  • LED status indicators
  • Isolated 5 A SPDT contacts

Product Literature

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		Termination TypeMounting MethodDimensionsWeight (lbs/g)Control TypeInput AC Line Frequency (Hz)Input Tolerance (%)Output Load Rating (VA)Output TypeResponse Time (ms)Sense Resistance ToleranceSense Resistance (Ohms)Sense VoltageStockSamplesCompare
LLC52AA24 VacIsolated SPDTOctal 8-pin plug-inPlug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.355 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminalsCheckOrder
LLC52BA24 VacIsolated SPDTOctal 8-pin plug-inPlug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.355 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminalsCheckOrder
LLC54AA120 VacIsolated SPDTOctal 8-pin plug-inPlug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminalsCheckOrder
LLC54AAS120 VacIsolated SPDTOctal 8-pin plug-inPlug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminalsCheckOrder
LLC54AF10120 VacIsolated SPDTOctal 8-pin plug-inPlug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s±10% or 500 Ω whichever is greater10 fixedPulsed DC at probe terminalsCheckOrder
LLC54BA120 VacIsolated SPDTOctal 8-pin plug-inPlug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminalsCheckOrder
LLC54BAS120 VacIsolated SPDTOctal 8-pin plug-inPlug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminalsCheckOrder
LLC56AA230 VacIsolated SPDTOctal 8-pin plug-inPlug-in socket3.01 H x 2.39 W x 1.78 D in. (76.5 x 60.7 x 45.2 mm)0 KgResistance sensing for high and low level detection of conductive liquids50 / 60-0.35 A resistive @ 240 Vac; 1/10 hp @ 240 VacElectromechanical relayDebounce time delay <1 s1 kΩ ±500; at low end; 100 kΩ; ±25%; 0% at high endAdjustable to 100Pulsed DC at probe terminalsCheckOrder
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