Liquid Water Level Controller Why you need it Keeps water between set limits automatically to prevent overflow and dryrun. Protects pumps and valves by switching them only when . Gives clear, realtime visual status so you can monitor levels at a glance. Key features and benefits Threecolor LED status: red = low, yellow = medium, green = for quick level identification. Function switch for mode selection: choose automatic filling or automatic drainage; the relay activates according to the detected water level. Automatic relay control: relay turns on and off when water reaches the or low limits to maintain the desired level without manual intervention. Reliable electrical performance: 5V working voltage with a 10A / 250V relay contact capacity suitable for controlling typical water pumps and solenoid valves. Compact and easy to integrate: controller PCB size 42 x 69 mm; sensor PCB size 86 x 21 mm, allowing installation into tight spaces or retrofit into existing systems. Durable build: constructed from quality material for stable, continuous operation. Compatibility and use Designed to control external water pumps or solenoid valves directly via the onboard relay. Suitable for systems that use a 5V control supply. Practical applications Home water tanks: automatically fill or drain overhead and storage tanks to maintain steady supply and prevent overflow. Small irrigation or greenhouse systems: maintain reservoir levels for pumps and irrigation schedules without constant monitoring. Aquariums, garden ponds, or industrial buffer tanks: prevent pump damage from lowwater conditions and avoid unintended overflows. Operation and installation Simple to use: install sensor and controller, connect 5V supply and pump/valve to the relay, then use the function switch to select fill or drain mode. Visual confirmation via tricolor LEDs and automatic relay switching ensures straightforward setup and reliable level control. Specifications Working voltage: 5V Relay contact: 10A / 250V Controller PCB: 42 x 69 mm Sensor PCB: 86 x 21 mm Indicators: tricolor LEDs (red = low, yellow = medium, green = ) This controller provides a compact, reliable solution for automated water level management in a variety of residential and small commercial applications.