English
русскийThe main types of liquid level sensors are ultrasonic liquid level sensors, capacitive liquid level sensors, photoelectric liquid level sensors, microwave optical sensors, etc., and their applications are as follows:
Ultrasonic liquid level sensor: used to detect the content of viscous liquid substances and the content of volume substances. They work by generating audio waves in the frequency range 20 to 200 kHz and then copying these waves back to the transducer. The response of ultrasonic sensors is affected by turbulence, pressure, humidity and temperature. In addition, the transducers must be appropriately increased for better response. Can be used to control level, fine solids in mining and powders, food and beverage industries, and chemical processing.
Capacitive liquid level sensor: used to detect liquid level changes such as mud and aqueous solutions. The sensor is used to check the liquid level change by using a probe made of polytetrafluoroethylene insulated wire, and the change in the liquid level causes the capacitance change, according to The detected capacitance value is used to determine whether the position of the sensor is in a water state or an anhydrous state. However, stainless steel probes are extremely responsive, making them suitable for measuring non-conductive particles or materials with low dielectric constants. These types of sensors are very easy to use and clean because they don't have any moving parts. They are commonly used in applications such as chemical, water treatment, food, level monitoring in the battery industry, involving high pressure and high temperature.
Photoelectric Level Sensors: Used to detect liquids, including stable substances, interfaces between two immiscible liquids, and the presence of deposits. Their work is based on changes in the transmission of infrared light emitted by infrared LEDs. Using high-energy infrared diodes and pulse modulation methods, light-producing interference can be reduced. Photoelectric level sensors, on the other hand, use high-intensity lasers that can be injected into dusty environments and notice liquid substances. They are commonly used in applications such as leak detection and tank level measurement.
Microwave Optical Sensors: This type of sensor is suitable for different temperature, pressure, dirty and humid environments because microwaves can easily pass through these situations without involving the energy transfer of air molecules. Microwave optical sensors can detect conductive water and metallic substances. Measurements are made using time domain or pulse reflection methods. They are commonly used in applications such as vapor, humid and dusty environments. They are also used in systems with different temperatures.
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