P31 water liquid level pump sensor, 52 mm float switch, 500 mA

P31 liquid level sensor - float switch

The P31 liquid level sensor is a reliable device that works on the principle of a reed switch. The module is versatile and is well suited for projects using microcontrollers, including Arduino, Raspberry Pi, ESP8266, and ESP32.

The design is based on a float with a built-in magnet and a shaft containing a reed switch. The kit includes a nut with a gasket, which simplifies mounting and ensures sealing and durability of the whole assembly.

How the float works

The sensor continuously responds to changes in liquid level in the tank:

• When the float is in the lower position - closed circuit
• When the float is in the upper position - open circuit

Key technical specifications

• Maximum switching voltage: 100V DC
• Maximum switching current: 0.5A
• Mounting hole diameter: 7.5 mm
• Cable length: 34 cm

Example applications

• Monitoring water level in tanks and aquariums
• Protecting water pumps from dry running
• Automatic irrigation and hydroponic systems
• Liquid level control in industrial equipment and home appliances
• Home automation and smart home projects

Benefits

• Simple, trouble-free design based on a reliable reed switch
• Easy and quick installation thanks to the included nut and gasket
• Seamless integration with popular development platforms
• Immediate response to changes in the monitored liquid level
• Safe operating parameters ideal for low-voltage systems