Electrode Level Sensor Working Principle

The principle of operation of electrode level sensors is mainly based on the change in conductivity of the liquid and the voltage difference between the electrodes.

Specifically:

1. The sensor head is partially submerged in the measured liquid, and the sensing and grounding electrodes on it are in contact with the liquid.

2. When the liquid level changes, such as when the level is raised or lowered, the resistance between the liquid and the electrode changes accordingly.

3. The conversion circuitry in the sensor head is responsible for measuring this resistance change and converting it into a voltage or current signal.

4. To improve the accuracy and reliability of the signal, the conversion circuit may also amplify and filter the output signal.

5. Finally, these processed signals can be connected to a control system or display device for accurate level measurement and monitoring.

It is also possible for electrode level sensors to indirectly measure the level height by utilizing the small electrical currents formed between the liquid and the electrodes, as differences in conductivity result in variations in the electrical currents. This method relies on the concentration differences present in the liquid that allow the conductivity to vary from location to location, which in turn produces a perceptible amount of current flow.

In summary, the principle of operation of the electrode level sensor is mainly to determine the liquid level height by measuring the change of resistance or current between the electrodes, and it is usually necessary to convert these signals into electrical signals that can be controlled for further processing and use by the system.