Comparison between Separated Photoelectric Liquid Level Sensors and Capacitive Liquid Level Sensors 1

The split-type photoelectric liquid level sensor and the capacitive liquid level sensor are two common types of AD9708ARUZ liquid level sensors. They differ in principles, structures, and applications, among other aspects. Below is a detailed comparison of these two sensors.

1. Principle:

The split-type photoelectric liquid level sensor consists of a photoelectric sensor and a light source, utilizing the light transmittance of the liquid to measure the height of the liquid level. When the liquid level is above or below the set threshold, the light is blocked or transmitted, thereby altering the output signal of the photoelectric sensor.  diode,

The capacitive liquid level sensor operates based on the principle of capacitance. The electrodes of the liquid level sensor come into contact with the liquid, forming a capacitor between the liquid and the electrodes. When the liquid level changes, the capacitance value varies, allowing the height of the liquid level to be determined by measuring these capacitance changes.

2. Structure:

The separated photoelectric liquid level sensor typically consists of two parts: the photoelectric sensor and the light source. The light source is usually positioned above the liquid level, while the photoelectric sensor is located below the liquid level. The light source can be infrared, laser, or LED, among others. The photoelectric sensor may include a photodiode or photosensitive transistor, and so on.

The capacitive liquid level sensor consists of electrodes and a capacitance measurement circuit. The electrodes are typically made of metal materials, such as stainless steel, and are used to contact the liquid. The capacitance measurement circuit is employed to detect changes in capacitance. diode