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Q1. What is the sensor working principle?
A. Its working principle is to use the water sensing capacitor to detect whether liquid is present, in the absence of liquid near the sensor, since the presence of distributed capacitance, and therefore there are some certain static capacitance to ground on the sensor, when the level was slowly increased and close to the sensor, the parasitic capacitance of the liquid will be coupled to the static capacitance so that the final capacitance value of the sensor becomes larger and the changed capacitance signal is then input to the control IC for signal conversion, converting the changed capacitance into the amount of change in the electrical signal, and then by a certain algorithm to detect and judge the degree of this change, when the amount of change exceeds a certain threshold that means the liquid level to reach the induction point.