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Focus On Level Measurement
How to select the radar level meter from the antenna?
The antenna is the eye of the radar level gauge, and the shape of the antenna must be suitable for the physical characteristics of electromagnetic waves. The shape of the antenna determines the focus and sensitivity of radar waves, just like the sensitivity of a microphone. Therefore, the applicable environments of radar level gauges with different antennas are also different. This requires us to select the radar level meter with the corresponding antenna according to the characteristics of the working conditions when selecting the model. Next, we will specifically introduce how to select the radar level gauge from the perspective of the antenna.
1. Horn antenna
The focusing characteristic is good, and it can be applied to most occasions. The working pressure is 64bar (1bar=100kPa). If the corresponding cooling measures are adopted, the temperature of the measured medium can reach 1000°C. Many storage tanks and reaction tanks use this type of antenna on site, but it is not suitable for measurement of corrosive media.
2. Rod antenna
The mounting flange of the pole antenna is small in size, has good chemical stability, is easy to clean, and is not sensitive to the adhesion of condensed water. It is especially suitable for measuring corrosive media. The working pressure can reach 16bar and the temperature of the measured medium can reach 200. ℃. Its launch angle is large, the signal-to-noise ratio is small, and it is commonly used in tanks with better measurement conditions and for the measurement of corrosive media.
3. Flange-mounted antenna
It is suitable for high temperature medium, corrosive medium or measurement environment that cannot be installed on the top.
4. Antenna with casing installed:
The casing has a focusing effect on radar waves. This type of table can be selected when the dielectric constant of the medium is low (1.6~3) or the continuous eddy current is generated on the liquid surface or the device in the container causes false reflection. The antenna is installed in a still-wave tube or a bypass tube, and the casing will affect the running time (depending on the inner diameter of the casing), so the inner diameter of the casing should be input to the electronic components to compensate for the change in the running time. In addition, the fluidity of the measured medium is required to be relatively good, and it is not easy to form a hanging material.
5. Shell material: aluminum shell instrument is not resistant to alkali corrosion. Try to choose plastic in this kind of occasion.
6. When the tank and tank are relatively high, a parabolic antenna should be used because of its good aggregation.