Nowadays, with the continuous development of electronic technology, many intelligent equipment need to use sensors to detect the liquid level, so what are the commonly used liquid level detection methods.

The photoelectric liquid level sensor uses the refraction or reflection phenomenon of light propagation in the liquid, and the light emitted by the transmitter in the detector is reflected or refracted back to the receiver on the liquid surface, so as to detect the change of the liquid level of the installation position. Compared with the floating ball switch, it has the advantages of high accuracy, not easy to jam failure, photoelectric liquid level sensor has the advantages of high accuracy, good stability, easy to install, so it is widely used in intelligent small home appliance equipment to detect liquid level change, to realize the function of liquid shortage alarm reminder.

The capacitive liquid level sensor uses the capacitance principle to detect the position of the liquid by measuring the change in the capacitance value. It is usually composed of two metal electrodes, and when the electrodes are filled with liquid, the capacitance value between the electrodes changes to judge the change in the liquid level.

The pipe level sensor is a sensor that detects the level change inside a water pipe. It adopts the principle of capacitance, using the refraction or reflection phenomenon that occurs when the light travels in the liquid, to detect the change of the liquid. Pipeline liquid level sensor has the advantages of high accuracy, good stability and easy maintenance, so it is widely used in intelligent sweeping robot to realize the function of liquid deficiency alarm.

The ultrasonic liquid level sensor uses the reflection phenomenon occurring when the ultrasonic wave travels in the liquid to determine the position of the liquid by measuring the change in the propagation time of the ultrasonic wave from the transmitter to the receiver. Ultrasonic liquid level sensor has the advantages of large measurement range, high accuracy and strong anti-interference ability, so it is widely used in some specific fields.

The commonly used liquid level detection methods include photoelectric liquid level sensor, capacitive liquid level sensor, pipeline liquid level sensor and ultrasonic liquid level sensor. These methods have different advantages and disadvantages and application fields, so we need to choose appropriate liquid level detection methods.