LLC1 Series – Open Board Liquid Level Controls 系列 - Littelfuse LLC1 Open Board Liquid Level Controls Provide Superior Protection

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The LLC1 series is a single-probe, conductive liquid level control designed for OEM equipment and commercial appliance applications. This unit may be ordered with fixed-fill or fixed-drain operation. A time delay (1-60 s) 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 1 mA determines the presence or absence of liquid between the probe and common. The LLC1 series printed circuit board is conformally coated to resist moisture and corrosion.

工作原理
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.

功能与特色

• Isolated ac voltage on probe
• Open PCB design
• Conformally coated PCB
• Sensitivity adjustment