Liquid Level Gauge - External Mount

This is a non-contact liquid level sensor that can detect the liquid height in a closed container, overcoming the problem of thick container walls.

Its working principle is to use a water sensing capacitor to detect whether liquid is present.

In the absence of liquid near the sensor, there will be a presence of distributed capacitance, and therefore there is a certain static capacitance to ground on the sensor. If the liquid is close to the sensor, the final capacitance of the sensor becomes larger.

Then, the changeable capacitance will be converted into a variation in signal. A certain algorithm will detect and determine the amount of this variation. When a certain threshold value is exceeded, the liquid level is considered to have reached the induction point.

Equipped with a XH2.54 conversion board, the signals can be controlled using a sliding switch. Sliding the switch to the SET end indicates a high level, while sliding it to the opposite end indicates a low level.

It can be interfaced with Arduino and other controllers, allowing digital signals to be collected directly.