What is the working principle of the liquid level sensor?

Do you know what the level sensor is? Where is the level sensor used? What function does it have? Do you know all this? Let's briefly introduce some basic knowledge of liquid level sensor.

The liquid level sensor has three sensing wires, which are red, blue, red is the positive pole of the power supply, blue is the negative pole of the power supply, and one is the signal wire.

Is there a difference between the level switch and the level sensor?

Hydraulic switch and liquid level sensor are both relay principles. One is the switch control circuit. The other is the circuit element equivalent to voltage and current transformation.

Simply put, if you only need to detect no water and high water level, you can use the liquid level sensor, which can realize the water-free alarm function and remind users to add water, such as humidifier. On the basis of detecting low water level and high water level, the water level switch can also realize automatic water adding function when no water is detected, such as water heater.