Application principle of capacitive liquid level sensor

- Oct 23, 2020-

Capacitive liquid level sensors are now more and more widely used in life. It can be used in coffee machines, hand sanitizers and other electrical appliances. It sends out a signal to detect the liquid level by sensing the difference in capacitance of the liquid in the container.


The capacitive liquid level sensor has the characteristics of high reliability. Because it can perform non-contact detection, the corrosiveness of the liquid has no effect on the sensor. For example, the liquid in the hand sanitizer machine is liquid soap, and capacitive type can also be used. Compared with other float type and electrode type liquid level sensors that require openings on the container and the container cannot move, the capacitive liquid level sensor does not need to touch the liquid, so the container can move at will. The advantage of capacitive liquid level sensor detection is that it can detect the change of liquid level in the container through any medium. The test results will not be affected by dirt and sediment in the water tank container.


When the capacitive liquid level sensor is used for measurement, the height of the liquid in the container changes, its capacitance will change. It can convert the change of the liquid level into a standard current signal, and the device will send out an alarm or automatically control after receiving the signal. So as to achieve the role of liquid level reminder. Not only can the liquid level be measured, but also the lack of liquid reminder or liquid shortage protection can be realized by using this function.