Description

The LLC1 Series is a single probe conductive liquid level control

designed for OEM equipment and commercial appliances. This

unit may be ordered with fixed fill or fixed 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.

FEATURES BENEFITS

Isolated AC voltage

on probe Prevents scale buildup on the probe

Open PCB design Cost effective design for OEM equipment and

commercial appliances

Conformally coated PCB Protects against moisture and corrosion

Sensitivity adjustment Provides accurate level sensing while ignoring foam

or floating debris