
The Float Sensor Switch for Water Level Controller is a simple and reliable liquid-level detection device designed to monitor the presence or level of water and other compatible liquids inside tanks, containers, reservoirs, and storage systems. The sensor uses a magnetic float and internal reed switch mechanism to provide an electrical ON/OFF signal when the liquid level rises or falls.
As the liquid level changes, the floating element moves along the sensor stem. A magnet inside the float activates the sealed reed switch located inside the stem, changing the electrical contact state. This simple operating principle provides reliable level detection without requiring complex electronic circuitry or continuous power for the sensing mechanism.
The float switch is commonly used with water-level controllers, relays, contactors, pumps, alarms, Arduino, ESP32, STM32, and other control systems. Depending on installation orientation, many float switch designs can be configured for Normally Open (NO) or Normally Closed (NC) operation by reversing the float position. It is suitable for automatic tank filling, pump protection, overflow prevention, low-water alarms, and liquid-level monitoring projects.
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