The Model 0025020 is a compact, high-reliability normally open (NO) liquid float switch sensor constructed from durable polypropylene (PP). Designed to detect liquid levels within tanks, sumps, and reservoirs, this sensor reliably triggers water pumps, indicators, warning alarms, or wireless remote transmitters when water reaches the designated threshold.
Key Features
- Corrosion-Resistant PP Construction: High-grade polypropylene body and float ball suitable for water, mild acids, and diverse liquid environments.
- Hermetically Sealed Reed Switch: Internal magnetic dry reed switch ensures fast response, low power consumption, and long operational life.
- Normally Open (NO) Configuration: Circuit closes when the liquid level rises and floats the magnetic ring into proximity with the internal reed switch.
- Compact & Easy Installation: Compact 18mm × 37mm footprint with 30cm pre-wired leads for effortless vertical mounting in tight spaces.
Technical Specifications
- Model Number: 0025020
- Body & Float Material: Polypropylene (PP)
- Contact Type: Normally Open (NO)
- Maximum Switching Voltage: DC 100V
- Maximum Switching Current: 0.5A
- Maximum Power Rating: 10W
- Operating Temperature: -20°C to 80°C (-4°F to 176°F)
- Lead Wire Length: 30 cm (approx. 11.8 inches)
- Dimensions: 18 mm × 18 mm × 37 mm
- Mounting Orientation: Vertical
Working Principle
The liquid level float switch operates using a magnetic float ball and a hermetically sealed dry reed switch housed inside the central stem. As the liquid level rises, the buoyant magnetic float moves upward toward the reed switch. When the magnetic field aligns with the internal switch contacts, the circuit completes (closes). As the liquid drops, the float moves away, opening the circuit.
Applications
- Water storage tanks, cisterns, and sump pits
- Aquariums, hydroponics, and fish tanks
- Automatic water pump control systems and liquid high/low alarms
- Wireless transmitter trigger inputs for automated remote switching
Usage Notes
- Load Protection: The dry reed switch is designed for signal-level control (max 0.5A / 10W). To switch high-power loads such as AC water pumps, motors, or contactors, always connect through an intermediate relay or contactor.
- Installation: Must be mounted vertically for proper gravity-assisted float operation.