It can detect the movement of the receiving position on the optical receiving element as long as the position of the target object changes. The displacement of the target can be calculated. Non-contact sensors can record different positions, speeds, temperatures, ambient air quality, and distances without contact. These sensors are solid-state electronic devices that can generate electromagnetic fields or beams of light and detect any interference within a specific area. The development of these sensors requires less maintenance because the company's fixed components are used for scanning. Below are some common sensor types used in non-contact sensor designs. The technology used in sensors for specific environments depends heavily on the monitored parameters or conditions (such as temperature, pressure, vibration, position, etc.). What are the different types of non-contact liquid level sensors and what are their principles?
I. Types of Non-Contact Liquid Level Sensors
Capacitive level sensors, ultrasonic level sensors, and discrete photoelectric level sensors are three types of non-contact level sensors. A common characteristic of these three types is that they are unaffected by the color, corrosiveness, pressure, density, etc., of the liquid. Because these sensor technologies do not involve direct contact with the liquid, they are more hygienic, eliminating the need for container cleaning and refilling.
These three types of non-contact liquid level sensors share the common feature that they are unaffected by factors such as liquid color, corrosiveness, pressure, and density. Furthermore, since the sensor does not directly contact the liquid, it is more hygienic and convenient for users to clean and add liquids to the container.
Ultrasonic level sensors detect liquid levels based on the principle of sound wave reflection. Their biggest advantage is their ability to detect changes in liquid level in real time, which is impossible with other non-contact level sensors. Because the sensor converts water level into data, users can clearly know the remaining water volume in real time. Ultrasonic level sensors have an accuracy of ±2mm, offering high precision and very accurate liquid level detection.
II. Principle of Non-Contact Liquid Level Sensors
The installation process is simple because it detects liquid levels by attaching it to the container. Capacitive level sensors are mainly used in household appliances due to their small size and low cost. If the capacitive level sensor is installed on the valve body, the container can be moved freely. For example, a capacitive level sensor detects low liquid levels in an aromatherapy diffuser. When the sensor detects that only 20 ml of fragrance remains in the diffuser bottle, it will send a signal to alert the user. Upon receiving the signal, the device will activate a buzzer or light an alarm. The user can then remove the bottle to add liquid or simply replace the bottle with a new one.
The detachable photoelectric level sensor possesses all the characteristics of photoelectric devices, resisting high temperatures, high pressures, and corrosion. It offers high level control accuracy, maintaining the level within ±1mm. The detachable level sensor also utilizes resin sealant and has no internal moving parts, ensuring high reliability.
What are the different types of non-contact liquid level sensors and what are their operating principles? Split-type photoelectric liquid level sensors are widely used in household appliances, the medical industry, and other fields due to their small size, high accuracy, and high reliability. Split-type photoelectric liquid level sensors also allow for free movement of the container. Compared to capacitive liquid level sensors, split-type photoelectric liquid level sensors offer higher accuracy and reliability. Split-type photoelectric liquid level sensors use the principle of light reflection to detect liquid level, minimizing the impact on the measured liquid and promoting hygiene. Crucially, the sensor can be installed top, bottom, side, or at an angle, and the installation process is simple.
