A float switch for water level sensing can be used to design a water tank overflow alarm system. This sensor has a moving ring on a cylindrical body. A reed switch is housed inside the central cylinder which senses the movement of outer ring under the influence of buoyant force of rising water level.
This is NO type switch which closes on sensing of raising water level. It can be changed to NC by changing the cylinder direction.
Carbon Sensor for Water Level Controller and Indicator
Float Switch with Snap Type Mounting for 3/4″ Pipe Water Level Sensor
Vertical Mount Float Switch Normally Open 1m wire with weight
BC547 NPN Transistor (Pack of 5)
Float Switch with Snap Type Mounting for 3/4" Pipe Water Level Sensor
100mm Long Float Switch Normally Open 1m wire 












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