The difference between radar level gauges and guided wave radar level gauges

Conventional radar uses non-contact measurement, while guided wave radar employs contact measurement; this means that guided wave radar requires more consideration to be given to the corrosiveness and adhesiveness of the medium, and its installation and maintenance become more difficult when it is too long. Conventional radars can be used interchangeably, whereas guided wave radars generally cannot be interchanged because the length of the guided wave rod (cable) is fixed according to the original operating conditions; as a result, selecting a guided wave radar is more complicated than selecting a conventional radar. When measuring solid materials, guided wave radar also needs to take into account the stress on the guided wave rod (cable). Due to this stress, the measurement range of guided wave radar is generally not very long, whereas conventional radar is commonly used for tanks with a length of 30 or 40 meters, and can even be used to measure distances up to 60 meters. However, in some specific operating conditions, guided wave radar has clear advantages; for example, when there is stirring inside the tank or significant fluctuations in the medium, the measurement values obtained using a guided wave radar fixed at the bottom are more stable than those from a mobile radar ； There is also level measurement in small tanks; due to the limited space available for installation or the presence of many obstacles inside the tank, conventional radars are generally not suitable, and this is where the advantages of guided wave radars become evident ； Another consideration is the condition of low dielectric constant; both radar and guided-wave radar operate on the principle of differences in the dielectric constant of materials. Since the waves emitted by conventional radar are divergent, when the dielectric constant of a material is too low, the signal becomes too weak, resulting in unstable measurements. In contrast, guided-wave radar uses waves that propagate along guided rods, which ensures relatively stable signals. Additionally, most guided-wave radars have a bottom detection function that allows for corrections based on the signals reflected from the bottom, thereby making the signals more stable and accurate.

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One is a flared type with a waveguide rod

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