The water level sensor is composed of a housing, a resistor and an induction rod;
A resistive water level sensor that can be used to sense the changes in water level or liquid interface consists of multiple resistors connected in series and their probes, or resistor rods (bars, tubes) with continuously distributed resistors or wrapped around an insulating plastic rod resistance wire. It is realized by the principle that the built-in resistance of the device and the measured liquid have partial conductivity characteristics. The total resistance of the sensor has a good linear relationship with the depth of the sensor submerged in water or liquid. The depth of sensor submerged in water or liquid can be obtained by measuring the resistance value of the sensor.