LLC24B1AC - LLC2 Series

Series: LLC2 Questions? Contact Littelfuse Support
Littelfuse Liquid Level Controllers
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.

Property (Mouseover for details) Value
Input Voltage (V) 120VAC
Input Tolerance (%) -0.3
Input AC Line Frequency (Hz) 50/60Hz
Output Type Electromechanical relay
Output Form Isolated SPDT
Output Load Rating (VA) 10A resistive @ 120/240VAC and 28VDC; 1/3hp @ 120/240VAC
Sense Voltage 12VAC at probe terminals
Sense Resistance (Ohms) Adjustable to 100kΩ
Sense Resistance Tolerance Guaranteed range
Control Type Resistance sensing for high and low level detection of conductive liquids
Isolation Voltage (V) ≥1500V RMS between input output and probe
Circuitry Printed circuit board is conformal coated to resist moisture and corrosion
Life Mechanical - 1 x 107; Electrical - 1 x 105
Termination Type 0.25 in. (6.35mm) male quick connect terminals
Mounting Method Surface mount to probe common with two or four #6 (M3.5 x 0.6) screws
Operating Temperature -20° to 55°C (-4°F to 131°F)
Storage Temperature (F/C) -40° to 80°C (-40°F to 176°F)
Dimensions 4.00 x 3.00 x 2.00 in. (101.6 x 76.2 x 50.8mm)
Weight (lbs/g) ≅9.0oz (255g)