ABB 120VAC Liquid Level Control LLC54AA

ABB 120VAC Liquid Level Control LLC54AA

The ABB LLC54AA is a dual-probe conductive liquid level control device designed for efficient management of liquid levels in various industrial applications. Operating at 120VAC, this unit offers precise control for both fill (pump-up) and drain (pump-down) operations, ensuring optimal performance in systems requiring accurate liquid level monitoring.

Key Features

• Dual-Probe Level Control: Utilizes two probes to detect high and low liquid levels, providing reliable control for conductive liquids.
• Adjustable Sensitivity: Features an adjustable sensing resistance up to 100 kΩ, allowing customization to specific application requirements and minimizing false tripping caused by debris or foam.
• Isolated SPDT Output Contacts: Equipped with isolated Single Pole Double Throw (SPDT) contacts rated at 5A resistive at 240VAC, suitable for controlling various loads.
• LED Status Indicator: Includes an LED indicator for visual confirmation of relay status, facilitating easy monitoring and troubleshooting.
• Plug-In Socket Mounting: Designed for convenient installation with an octal 8-pin plug-in configuration, simplifying setup and maintenance.

Operational Modes

The LLC54AA supports two primary operational modes:

• Drain (Pump-Down) Mode: When the liquid level rises to the high-level probe, the output relay and LED energize, remaining active until the level falls below the low-level probe. The relay and LED then de-energize, staying inactive until the liquid rises again to the high-level probe.
• Fill (Pump-Up) Mode: When the liquid level drops below the low-level probe, the output relay and LED energize, staying active until the level reaches the high-level probe. The relay and LED then de-energize, remaining inactive until the liquid level falls below the low-level probe once more.

Technical Specifications

• Input Voltage: 120VAC
• Input Tolerance: -20% to +10%
• AC Line Frequency: 50/60 Hz
• Output Load Rating: 5A resistive at 240VAC; 1/10 HP at 240VAC
• Response Time: Debounce time delay of less than 1 second
• Operating Temperature Range: -20°C to 60°C (-4°F to 140°F)
• Dimensions: 3.01″ H x 2.39″ W x 1.78″ D (76.5 x 60.7 x 45.2 mm)

The ABB LLC54AA is an effective solution for applications requiring precise liquid level control, offering adjustable sensitivity, reliable performance, and user-friendly installation features.