Last Updated on April 3, 2023 by You Ling
Application of Piezoelectric Ceramics in liquid level sensor
What is liquid level sensor?
A liquid level sensor is a device used to detect and measure the level of a liquid in a container or vessel. The sensor is typically installed in the container or attached externally and detects the level of the liquid using various sensing techniques.
There are many different types of liquid level sensors, including those that use mechanical, optical, electrical, and ultrasonic methods to measure liquid level. Mechanical sensors use a float or probe that moves up and down with the liquid level, while optical sensors use light to detect the level of the liquid. Electrical sensors use conductivity or capacitance to detect the liquid level, and ultrasonic sensors use sound waves to measure the distance between the sensor and the liquid surface.
Liquid level sensors are commonly used in a wide range of industrial and commercial applications, including in the food and beverage industry, chemical and petrochemical plants, and water treatment facilities. They are also used in consumer products such as coffee makers, refrigerators, and washing machines to control and monitor the level of liquids. The accuracy, reliability, and durability of liquid level sensors are important factors in ensuring the safe and efficient operation of these applications.
How liquid level sensor works ?
There are different types of liquid level sensors, and each works using a different sensing technique. However, the basic principle is to detect the level of the liquid in a container or vessel and provide a corresponding output signal.
For example, a mechanical liquid level sensor typically uses a float or probe that moves up and down with the liquid level. The float or probe is connected to a lever that actuates a switch or other type of sensor when the liquid level reaches a certain height. The switch or sensor then sends an electrical signal to a controller or other monitoring device that can trigger an alarm, control a valve, or perform other actions.
An optical liquid level sensor uses light to detect the level of the liquid. The sensor consists of an emitter and a receiver that are mounted on opposite sides of the container. The emitter sends a beam of light across the container, and the receiver detects the amount of light that is reflected back. The amount of light that is reflected depends on the level of the liquid, and the sensor can determine the liquid level by measuring the amount of light that is detected.
Electrical liquid level sensors use conductivity or capacitance to detect the liquid level. Conductivity sensors measure the electrical conductivity of the liquid, which varies depending on the level of the liquid and its composition. Capacitance sensors measure the dielectric constant of the liquid, which also varies with the liquid level.
Ultrasonic liquid level sensors use sound waves to measure the distance between the sensor and the liquid surface. The sensor sends out a high-frequency sound wave that is reflected back from the liquid surface. The time it takes for the sound wave to travel to the liquid surface and back to the sensor is used to calculate the distance to the liquid surface, which can be used to determine the liquid level.
Overall, liquid level sensors work by detecting the level of a liquid in a container and providing a corresponding output signal, which can be used to monitor and control the liquid level.
Which piezo elements can be used for liquid level sensor?
that monolayer piezoelectric discs made from materials such as PZT40 are commonly used in ultrasonic level measurement applications. These piezoelectric discs are often used as the transducer element in the sensor, where they can be used to generate and detect high-frequency sound waves. PZT40 is a popular choice for these applications because it offers a good balance of sensitivity and power capability, which is important for both the actuation and sensing functions of the ultrasonic sensor. Other piezoelectric materials, such as PZT5A, PZT5H, and PZT8, may also be used for ultrasonic level measurement, depending on the specific application requirements.