A float sensor CSDP (double pin) is a type of level sensor that is used to detect the level of a liquid in a tank or container. It consists of a float that is attached to a switch, and as the float rises or falls with the level of the liquid, it activates or deactivates the switch. The CSDP sensor is characterized by the fact that it has two pins, or leads, that are used to connect the sensor to a control system, such as a microcontroller or a relay. The sensor is typically used in applications where the liquid level needs to be monitored or controlled, such as in sump pumps, water tanks, and overflow protection systems