GRL801 and GRL802 Liquid Level Controllers are precisionengineered devices designed to provide reliable and flexible control of liquid levels in tanks, reservoirs, and similar applications. Built to deliver consistent performance and easy configuration, these controllers are ideal for both industrial and commercial environments where accurate liquid level management is critical. Key Features and Benefits: GRL801 supports 2level control mode, for dualpoint monitoring. GRL802 offers a choice between 2level or 1level control mode, allowing greater flexibility for different system requirements. Multiple operating functions: Choose between Pump Up or Pump Down mode to suit filling or draining applications. Finetune pump activation with an adjustable output time delay ranging from 0.1 to 10 seconds, reducing wear and preventing rapid cycling. Adjustable sensitivity via potentiometer (5100K) ensures compatibility with a wide range of probe and liquid types. Galvanically separated supply voltage range of AC/DC 24240V provides broad installation compatibility and electrical isolation for safety. Output configuration: 1 SPDT relay rated at 10A / AC1, capable of handling substantial loads. Clear LED indicator for instant relay status monitoring, aiding fast diagnostics and maintenance. Performance and Compatibility: Works across a wide voltage range without additional converters. Supports integration with existing pumping systems and control panels. Built with quality components for long service life in demanding environments. Practical Applications: 1. Water storage tanks – Automate filling and draining processes to maintain water levels and prevent overflow or dry running. 2. Industrial fluid reservoirs – Ensure precise level control for lubricants, coolants, or process liquids in manufacturing equipment. 3. Agricultural irrigation systems – Manage water levels to provide consistent supply for crops while protecting pumps from damage. With configurable control modes, adjustable sensitivity, and broad voltage compatibility, the GRL8 series liquid level controllers deliver a dependable solution for effective liquid management in diverse operational settings.