Introduction to Contacting and Non-Contacting Liquid Level Sensors

Liquid level sensors can be divided into two types: contact type and non-contact type according to the measurement method. Liquid level sensors are often used in water treatment industry, metallurgical industry and petroleum, chemical and other industries. The following introduces two different measurement methods of liquid level sensors: contact type and non-contact type. Contact liquid level sensor Capacitive type, float type, float type, pressure type, etc. are all contact type liquid level sensors. In the process of liquid level measurement, the detection sensing element is in direct contact with the measured medium, and in some cases In the application, the detection sensor will produce reactants, which will cause the sensor to not work properly. Therefore, when choosing, it is necessary to understand the characteristics of the measured medium. Non-contact liquid level sensors Non-contact liquid level sensors mainly include radioisotope type, ultrasonic type, radar type, and external sticking type. For the radioisotope type liquid level sensor, because of its small range, it is not suitable for the occasion of large range liquid level measurement. The ultrasonic liquid level sensor not only has a wide range and can be used in large-scale measurement occasions, but also achieves non-contact measurement and is not affected by the medium. The disadvantage is that the application of the ultrasonic level sensor is restricted by the medium temperature, the ambient temperature, the fluctuation degree of the measured liquid level and many other external environmental factors. These constraints can seriously affect the measurement accuracy of ultrasonic level sensors. The characteristics of the radar type liquid level medium have a certain influence on the measurement range. The liquid with a small dielectric constant has a great influence on the measurement distance of the radar liquid level gauge, which reduces the measurement range; the liquid with a large dielectric constant has a negative impact on the radar level gauge. The influence of the measurement distance is small, which increases the measurement range. The externally attached liquid level gauge is suitable for the measurement of sealed containers and flammable and explosive dangerous media. The probe can be directly adsorbed on the bottom of the container and can be measured by using the principle of sonar distance measurement. It is not necessary to open holes in the container, and it can be measured without stopping work. Therefore, different liquid level sensors have different applications. According to the needs of on-site measurement, it is decided to choose contact type and non-contact type, and then see which measurement principle is more suitable for the current liquid level measurement.

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