With the rapid development of industrial measurement technology, guided wave radar level gauge has become a very mainstream measurement product. However, many users find it difficult to choose a guided wave radar level gauge when they hear professional engineers introduce different types of guided wave radar level gauges. Today, I will give you the classification of the level of the popular science guided wave radar and the working conditions for different types to answer your doubts.
As the electromagnetic wave emitted by the guided wave radar level gauge is mostly pulse wave, the selection of probe is the selection of guided wave radar level gauge. According to the structure of the probe, guided wave radar level gauges can be divided into five categories. The first is single rod type. The single rod probe is a metal rod with simple structure and is not easy to hang materials and scale. It is applicable to the liquid level measurement of high dielectric constant (relative dielectric constant 10~100) and medium viscosity (viscosity coefficient 1500cP), such as general aqueous solution, crude oil, hydrocarbons and other liquids, as well as the solid level measurement of powder particles. The second is the cable type wave guide rod. The probe is a flexible metal cable that can be bent. The applicable scenario is the same as that of the single rod probe, but the magnetic wave propagation loss is slightly higher. In some cases where the measurement range is large, the single rod probe can be replaced by the cable probe, which is convenient for transportation, installation and maintenance.
The third type is double rod type. The double rod probe consists of two parallel metal rods. The magnetic wave propagation loss of the double rod probe is small, and it can still have a strong echo signal when measuring low dielectric constant media such as oil products. However, the double rod probe is not suitable for measuring high viscosity liquids because it is easy to deposit materials and scale, causing false echoes and affecting the reliability of measurement results. The fourth type is double cable type. The double cable probe consists of two parallel flexible metal cables. The dual cable probe has smaller electromagnetic wave propagation loss and better echo signal quality, but it is not suitable for measuring high viscosity liquids. The last one is coaxial type. The coaxial probe is composed of a metal tube and a metal thin rod. Its structure is similar to the coaxial cable. The electromagnetic wave propagates in the space between the metal tube and the metal thin rod. Compared with other types of probes, it has the smallest energy loss, good echo signal quality, and can measure low dielectric constant liquids (relative dielectric constant 14~4.0) that cannot be measured by a single rod probe. In addition, it has strong anti-interference ability and high reliability, and has been widely used. However, due to the special structure and complex installation and maintenance of the coaxial probe, it is not suitable for the occasion with large measuring range. Due to the limited space between them, it is easy to produce material accumulation and pollution, which affects the reliability of the measurement results, so it is not suitable for the liquid level measurement of high viscosity media.
Post time: 05-01-23