When you need to control liquid levels in your tank, turn to this Sensata Cynergy3 float switch. It'll help you to avoid overflow when the tank is filling up, and let you know when the level is too low. The sensor floats on the top of the liquid and then causes the switch to operate when the liquid levels change. This device is a vertical switch that you can install on the top or the bottom of your tank, making it an ideal choice when there's no side access. It has a maximum current of 500 mA.

• Working pressure up to 20 bar for high-pressure systems
• Convenient reversible switch action
• Uses stable and reliable DIN connector for standard installation

There's a magnet inside the float and a reed in the switch. The float moves with the surface of the liquid, and when it gets near the reed, the force of the magnet opens or closes the switch, alerting you to the changing liquid levels.