LLC16A25AX - LLC1 Series

Series: LLC1 Questions? Contact Littelfuse Support
Littelfuse Liquid Level Controllers
The LLC1 Series is a single probe conductive liquid level control designed for OEM equipment and commercial appliances. This unit may be ordered with selectable or fixed fill or drain operation. A time delay (1-60s) prevents rapid cycling of the output relay. On adjustable units, the sensitivity adjustment allows accurate level sensing while ignoring foaming agents and floating debris. Isolated AC voltage is provided at the probe to prevent electrolysis. A trickle current of less than 1mA determines the presence or absence of liquid between the probe and common. The LLC1 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 probe, a fixed 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 energizes and remains energized until the liquid level falls below the probe. The output relay then de-energizes and remains de-energized until the liquid again touches the probe.
Fill (Pump-Up Mode): When the liquid level falls below the probe, a fixed 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 energizes and remains energized until the liquid level rises and touches the probe. The output relay then de-energizes and remains de-energized until the liquid level again falls below the probe.

Property (Mouseover for details) Value
Input Voltage (V) 230VAC
Input Tolerance (%) -0.3
Input AC Line Frequency (Hz) 50/60Hz
Output Type Electromechanical relay
Output Form Non-isolated SPST and isolated SPDT contacts
Output Load Rating (VA) 10A resistive @ 120/240VAC and 28VDC; 1/3hp @ 120/240VAC
Time Delay Range 25s fixed
Sense Voltage Low voltage AC between probe and common. Isolated from input and ouput.
Sense Resistance (Ohms) Adjustable to 250kΩ
Sense Resistance Tolerance Guaranteed range
Control Type ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling
Isolation Voltage (V) ≥1500V RMS between input output and probe
Surge Protection IEEE C62.41-1991 Level A
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 0.50 in. (12.7mm) nylon standoffs with three #6 (M3.5 x 0.6) screws (use terminal 5 for probe common)
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 3.50 x 2.75 x 2.00 in. (88.9 x 69.9 x 50.9mm)
Weight (lbs/g) ≅8.7oz (247g)