Radar level meter used in industry
Radar level meter since entering the market, due to the high measurement precision, high temperature and high pressure resistance ability is strong, and adopts non-contact measurement method, as metallurgy, petrochemical, food, coal and other industrial tank farm level measurement instrument first, received a wide range of use.
Material level meter in the selection, and the flow rate and pressure meter is very different. Reason is that material level measuring condition is different, and all can muster all design conditions using material level meter is very difficult to unity. Only fully understand the characteristics and field application, the condition of material level meter to choose right product, at the same time fully use the instrument performance.
Non-contact level instrument with ultrasonic level meter and radar level meter, and radar level meter dominant. This is because the use of radar level meter and the technical development in recent years has been rapid progress, the high frequency head and radar level meter antenna is equivalent to the eyes, echo processing system is equivalent to the brain. Radar level meter of electromagnetic wave reflection measured medium, the quality of the reflection wave reflects the effect of material level meter. Quality is defined as the MIN echo echo amplitude and the ratio of the maximum noise amplitude. Echo quality value, the greater the material level meter to measure the better the results.
Radar level meter advantages: is not affected by fluctuations in the air; High precision; Resistance to high temperature and high pressure; With the decay of distance; Strong penetrating power.
Main factors affecting quality of echo radar level gauge: (1) the dielectric constant of transmission medium, the more stable the more conducive to the constant transmission. Electromagnetic wave propagation in the process is not affected by medium degree of stability and, instead of only stability degree of the dielectric constant of the medium. The radar level meter and the big difference between ultrasonic level meter. (2) the surface of the measured medium level off, the dielectric constant, the greater the more conducive to echo reflection. So according to consider working conditions on site, need to pay attention to two aspects: 1, the antenna to the measured medium between the dielectric constant of air distribution. 2, bai medium surface condition and dielectric constant.
Radar level gauge has certain limitation: first, the influence of radar level gauge is the dielectric constant, vacuum radar little attenuation, affect the attenuation of radar material is in the air, such as: dust containing high dielectric powder (cement powder, graphite, plastic particles, etc.) of water vapor, etc. Make the measurement effect will be affected. Second, the measured medium volatile gas gathering on antenna, then can affect radar wave emission, serious cause radar wave can't send out. Third, the dielectric constant can't measured medium is too small. Fourthly, although the effects of temperature and pressure is small, but made of different material in the production of radar level meter can be used the range of temperature and pressure depends on the use of materials, and radar level meter seal structure itself.
Types and application of radar level gauge: radar level meter is currently the industry with the mainstream products, mainly divided into pulse radar level meter and guided wave radar level meter. Low frequency pulse radar level meter possesses the advantages of low price, single used mainly in the field of products to be being washed out gradually. Instead, the high frequency pulse radar level meter, its use in the process has high energy, wave velocity Angle is small, wireless size is small, the advantages of higher precision.
The operation condition of the metallurgical industry is more complex, the measurement demands of the various processes of material level meter is different, colleagues measuring dielectric properties; The temperature of the measured medium, pressure; Explosion-proof, protection grade requirements; Measuring environmental presence of dust, vapor, and bubble; Containers, pool and bin size and installation location to use different material level meter requirements. So, radar level meter selection before must have detailed knowledge of the operation condition of the use environment and analysis, to ensure that the use of radar level meter to obtain the best effect.