The Small Float Level Control Switch is a simple and reliable liquid level sensing device used to detect the presence or absence of liquid in tanks, containers, and reservoirs. It operates using a magnetic float mechanism that opens or closes an internal reed switch based on liquid level, making it ideal for water level monitoring and automation applications.
Core Switch Specifications
• Sensor Type: Float-type liquid level switch
• Operating Principle: Magnetic float with reed switch
• Output Type: Digital (ON / OFF)
• Mounting Orientation: Vertical (side/top mounting supported)
Electrical & Interface
• Operating Voltage: Up to 100 V DC / AC (switching, not supply)
• Switching Current: Typically up to 0.5 A (model dependent)
• Contact Type: Normally Open or Normally Closed (orientation dependent)
• Interface: Two-wire output
• Signal Type: Dry contact (no polarity)
Performance Characteristics
• Reliable level detection with minimal false triggering
• Fast mechanical response
• Suitable for continuous liquid level monitoring
• Performance depends on liquid density and mounting position
Physical Characteristics
• Body Material: Plastic (chemical-resistant)
• Float Material: Hollow plastic float
• Cable Length: Pre-attached insulated cable
• Compact and lightweight design
Compatibility
• Arduino (via pull-up and digital input)
• ESP8266 / ESP32
• PLC digital inputs
• Relay control circuits
• Water pump controllers
Key Advantages
• Simple and robust construction
• No continuous power required
• Long operational life
• Easy installation and wiring
Technical Insights
• Switching logic changes by flipping float orientation
• Works best with clean, non-viscous liquids
• Not suitable for high-pressure systems
• Reed switch provides electrical isolation
Applications
• Water tank level monitoring
• Automatic pump control
• Overflow and dry-run protection
• Aquarium and RO systems
• Industrial liquid level detection
Pro Tip
• Verify NO/NC behavior before installation
• Ensure float moves freely without obstruction
• Use debounce or delay logic in software if required
• Avoid installing near strong magnetic fields
Package Includes
• 1 × Small Float Level Control Switch