Analysis of general faults and solutions of radar level gauges

Radar level gauge can be widely used in metallurgy, building materials, energy, petrochemical, water conservancy, grain and other industries for on-site measurement of liquid level and container production. Compared with contact instruments such as capacitors and heavy hammers, it has unparalleled advantages. The transmission of microwave signals is not affected by the atmosphere, so it has strong advantages in measuring harsh environments such as volatile gases, high temperature (350°C), high pressure, steam, vacuum and high dust in the production process. It is a cost-effective Very high level gauge. In daily overhaul and maintenance, many failures of radar level gauges can be avoided. In order to reduce the failure rate in production and operation, Kaidi Instruments provides you with common failures and solutions of radar level gauges. 1. Common problems The reasons for the failure of the radar level gauge can be roughly classified into the following points: 1. There is a large area of u200bu200breflectors in the clearance between the liquid under test and the radar antenna, causing the electromagnetic waves to reach the liquid level before reaching the liquid level. be reflected. The main reasons for this phenomenon are: 1. There are metal objects such as stirrers, heating coils, pipelines, etc. inside the tested container. If these metal objects are exposed outside the tested liquid and are in the direction of vertical propagation of electromagnetic waves, such as The rotation of the slurry during the rotation of the mixer will cause the electromagnetic wave to be reflected back in advance, resulting in a high level of the measured liquid. 2. The installation site of the radar level gauge is too close to the container wall or is not perpendicular to the liquid surface to be measured, so that the electromagnetic wave is irradiated to the inner wall of the container and reflected back in advance; Oblique shot), so that the radar level gauge cannot detect the reflected electromagnetic wave; the electromagnetic wave reflected by the liquid surface loses too much energy through multiple reflections, and is not selected by the frequency selection circuit. The above conditions cause the radar level gauge to measure distorted. 2. There is hanging material on the waveguide (rope, rod). When the electromagnetic wave propagates along the waveguide, it encounters the hanging material on the waveguide before reaching the liquid and reflects back, resulting in a false liquid level. The installed waveguide is not perpendicular to the radar level gauge, which causes the electromagnetic wave to slant to the inner wall of the waveguide, resulting in the same reflection or multiple reflections as the inner wall of the container, which distorts the measurement. 3. In the clear space between the liquid under test and the radar antenna, the vapor concentration of the gas phase medium is too high, which causes the energy loss of the electromagnetic wave in the space propagation is too large, and even the reflected wave cannot reach the receiver of the radar level gauge at all. The liquid to be tested has heating requirements, especially when a mixer is installed on the upper part. Since the liquid to be tested is continuously volatilized during heating and stirring, the space above the liquid level will be filled with high-concentration medium vapor, and its tiny liquid particles It not only produces diffuse reflection of electromagnetic waves, but also absorbs a large amount of electromagnetic wave energy, so that the electromagnetic waves are greatly attenuated, so that the radar antenna cannot receive echo signals. When the measured liquid contains water, the volatile water vapor absorbs the energy of electromagnetic waves more seriously. Because the water vapor is easy to condense, the water vapor contained in the gas phase space will gradually condense near the tank wall at the top of the tank, and accumulate together to form larger water vapor droplets, which fill the space above the liquid level and have a strong energy absorption effect on electromagnetic waves. , resulting in the energy attenuation of electromagnetic waves is too large to reach the radar receiver, causing the radar level gauge to completely lose its ability to work. Fourth, the radar level gauge antenna is attached with stolen goods, so that the electromagnetic wave is reflected back just after it is launched, or even cannot be emitted at all. In such a situation, the sudden failure of the radar level gauge cannot be avoided even if the anti-condensation drop-shaped antenna is used. The stolen goods attached to the antenna of the radar level gauge are the upgrade and aggravation of the volatilization of the measured medium. The clear space of the measured liquid is filled with gas-phase vapor, which will adhere to the antenna of the radar level gauge, especially the highly viscous medium that is easy to condense. The level meter is installed at the top of the storage tank and the temperature is low, and the volatilized medium vapor is easily condensed and attached to the radar antenna, making it difficult to transmit electromagnetic waves. In severe cases, the medium may even coke on the antenna, damaging the antenna. 2. The key to finding the fault liquid point is the solution, and the solution and demonstration of important solutions are also key. The following is a list of solutions for 7 common liquid level gauge faults.
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