B/W Controls 1500-A-L1-S3-OC-X Liquid Level Control Relay

The B/W Controls 1500-A-L1-S3-OC-X is an induction-type relay designed for reliable liquid level control in industrial applications such as pump control, tank filling, and drainage systems. This model operates on the principle of low-voltage electrode sensing, where a small current flows through the liquid to activate the relay, ensuring safe and accurate level detection without direct high-voltage exposure to the liquid. Key features include a compact design for easy panel mounting, SPDT relay contacts for versatile control circuits, and compatibility with various electrode configurations for single or multi-level sensing. Advantages over similar products include robust construction for harsh environments, low maintenance requirements, and proven reliability in water treatment, wastewater management, and process industries. Drawbacks may include the need for periodic electrode cleaning in conductive liquids and limitation to AC power sources. This unit is ideal for automating pump operations to prevent overflow or dry running, offering energy efficiency and system protection. Based on attached images, the unit appears new in its original packaging, including a service bulletin from October 1987 detailing operation and wiring. For detailed resources, refer to Ametek B/W Controls official site (ametek.com) for 1500 series datasheets and manuals (e.g., search for 'B/W Controls 1500 Induction Relay Manual PDF'). Model decoding: '1500' series, 'A' for single-pole, 'L1' for low-level control, 'S3' for specific contact arrangement, 'OC-X' for open chassis with extras.