Regarding radar level gauges
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Since radar level gauges are not affected by temperature and the medium, why are there still requirements regarding temperature range and the dielectric constant of the medium? Thank you!
Radar does not have high requirements regarding the temperature of the medium, but it does require a high dielectric constant from the medium. Mediums with a low dielectric constant result in better echo responses from the waves emitted by the radar, meaning higher signal strength and more stable measurement values; the opposite is true in cases where the dielectric constant is high
Different media require different specifications~·
Temperature: Primarily applicable to areas with volatile substances or steam； Like the dielectric constant, it mainly affects echo quality. Personal opinion.
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Temperature refers to the operating temperature of the instrument, that is, it relates to the heating of the gauge face.
Guided wave radars come in coaxial and dual-rod types. The requirement regarding medium temperature may be due to different sealing materials between the gauge head and the rod; the dielectric constant of the evaporating medium changes, which affects the measurements of the guided wave radar. The effect of waves is very good when measuring the level of media with stable properties, such as water. However, once the medium is dirty, deposits will form on the measuring rod, which in turn affects the measurements taken by the guided-wave radar.
To correct that: the higher the dielectric constant, the better the echo effect
Consider that temperature mainly serves to protect the radar transceiver antennas and the electronic circuits in the transmitters； The dielectric constant is important because it determines the varying degree of signal attenuation as electromagnetic waves propagate through different media with distinct dielectric constants. The greater the difference in dielectric constants between different media, the better; a higher dielectric constant results in a stronger reflected signal.