Radar level gauge measurement value distortion reason

The radar level gauge has the advantages of low maintenance, high performance, high precision, high reliability and long service life. Compared with contact meters such as capacitors and heavy hammers, it has unparalleled superiority. The transmission of microwave signals is not affected by the atmosphere, so it can meet the requirements of harsh environments such as volatile gases, high temperature, high pressure, steam, vacuum and high dust. The product is suitable for harsh environments such as high temperature, high pressure, vacuum, steam, high dust and volatile gases, and can continuously measure different material levels. The main technical indicators of the instrument meet or exceed the similar products at home and abroad, and the installation and commissioning is simple. It can be used in a single station or in a network. It can be widely used in metallurgy, building materials, energy, petrochemical, water conservancy, grain and other industries.

Radar level gauge measurement value distortion causes:

The fault manifests itself as a change in the level and the measured value is constant. When the tank is empty or full, the meter maintains a distinct false level, or it appears as a low value when the tank is full. The usual causes of this type of failure are:

(1) Antenna scars. Thick, wet crusting produces a strong reflection of the microwave, keeping the meter's measurements at a constant high level.

(2) When the material is emptied, the antenna or nearby agglomerates generate interference echoes.

(3) When the material is empty, the fixed components in the tank cause strong echo. The following methods should be used to solve the above situation:

(4) Carefully clean the attachments near the antenna and antenna.

(5) Activate and reasonably set the "window resistance" distance. “Window suppression” is also called “near-site suppression”. This function is used to eliminate the influence of mounting flange welds, antennas or nearby materials on the measurement, and is an effective means to optimize the measurement. It sets the near-field suppression distance, and the instrument registers the echoes in this range as interference echoes and does not measure.

(6) Perform "fixed component echo suppression". In addition to intelligently filtering out interference echoes, the radar level gauge can also perform fixed component echo rejection by registering interference waves.

(7) When the material in the tank is full, the meter displays a lower level, which is due to the increase of multiple echoes in the tank due to the increase of the liquid level. When the program is processed, a long time echo of the beam is incorrectly recognized as the measurement back. Waves, thus calculating a larger distance over the sky. In this case, the near-field suppression distance should be modified to eliminate the effects of multiple echoes.