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Notes On Radar Model Selection

High frequency radar level transmitter is a leading product to measure solid level, such as VEGAPUL series from VEGA, FMR from E+H, LR from SIEMENS. There are popular Chinese brands, including DCRD1000A series from Xian Dechuang, GDRD5X series from Beijing Guda. Compared with low frequency radar, high frequency radar enjoys the advantages in the followings: 


I. High frequency radar level transmitter( refers to 26GHz and 24GHz) enjoys high energy and small field angle. For example, field angle of Φ95 horn antenna is 8o ; , emission angle is during Φ123. emission angle is during Φ246 ( normally as paraboloid),. It featured as small antenna size, high frequency.) Because low frequency radar leads to poor direction owing to low and dispersed energy, large emission angle. When horn antenna diameter of low frequency pulse radar is 246, field angle is 15o. Please attention: the more antenna size has, the smaller emission angle is during stable frequency.


II. 26GHz radar wave length is 11mm and 6GHz radar wave length is 50mm. When the bulk level is measured by radar, radar wave reflection comes from diffuse reflection. The intensity of diffuse reflection is directly proportional to material particle size, inversely proportional to wave length. For the similar material, more shorter wave length, more easily to reflect, thus the better echo signal achieve when radar measuring. It is just like basket ball come across table tennis ball, basket ball will not normally bounce back, so does table tennis ball. In normal case, a large amount bulk material diameter is far less than 50mm, so 26GHz radar for level measurement is an ideal plan.


III. Radar antenna will accumulate dirt or moisture due to worse field environment as time passed. Owing to small 26GHz radar antenna, radome is supplemented to greatly reduce dirt or moisture impact on measurement result. But 6GHz low frequency radar antenna is large, it is difficult to provided with radome. The instrument volume is larger, hard to clean.


IV. Measurement range is no more than 30m when 6GHz low frequency radar measures solid material, which it can not meet the requirements on material measurement( such as 2500T/d cement plant). But measurement range of the high frequency radar normally can be up to 70m, max.100m, which totally meet the requirements on large-scale cement production line.


V. Because high frequency radar level transmitter featured as good direction, small emission angle, strong anti-interference ability, it is applicable for longer diameter silo level measurement, in particular to calcium carbide furnace level, converter silo, etc. Medium and low frequency radar can not meet the requirements on measurement under these conditions.


VI. Low frequency radar compares to high frequency radar, due to its low frequency, dispersed energy and non-concentrated energy, anti-dust ability is far behind high frequency radar. To sum up, high frequency radar level transmitter is your ideal option.