The measurement principle of radar level gauges is to emit radar waves from the antenna, reflect the radar waves back to the receiver, and then calculate the height of the material. Various obstacles are encountered during the emission and reflection of radar waves; these obstacles have reflected light, but are not beneficial to the measurement. Radar level gauges make every technical effort to minimize interference. Ineffective installation of radar level gauges will affect the measurement results, so the necessary reflected waves should be avoided during installation.

　　1. The first thing to note, which we have repeated many times, is that the central axis of the radar level gauge antenna should be perpendicular to the reflective surface of the liquid level.

　　2. The main causes of interference are as follows: mixing valves inside the tank, attachments on the tank wall, ladders, etc. Therefore, during installation, it must be ensured that this interference is outside the signal range of the radar level gauge, and that there are no attached objects on the inner wall of the tank.

　　3. For radar level gauges of the speaker type, rod type, and other shapes, the distance between the bell port and the inner surface of the mounting hole must exceed a certain distance; when the antenna of the load level gauge is extended into the mounting hole, the length of the mounting hole cannot exceed 100mm. Instructions are provided in the manual; please refer to them carefully before installation.

　　4. To measure liquid levels with large fluctuations, a waveguide needs to be installed, which is called a guided wave radar level gauge.

　　What is the coverage range of a radar level gauge?

　　The radar level gauge is an advanced guided wave radar level meter that can measure a maximum distance of 70 meters. The antenna of the radar level gauge is further optimized, becoming a new high-speed microprocessor with faster processing speed than ordinary measuring instruments, including solid materials, process containers or strong dust crystallization, and condensation caused by the coverage range of the radar level gauge.

　　Radar level gauge coverage range 1, particulate materials

　　In cement plants, most of the raw materials are particulate materials, namely limestone, coal, shale, and other masonry materials. The semi-finished clinker is also particulate material, stored in warehouses or silos. The angle of repose of the material exists, but there is also a reflective interface. After determining the effective range based on the angle of repose and surface conditions of material inflow and outflow, it is recommended to use a non-contact radar level gauge, i.e., a level gauge with a rod or horn antenna. Level gauges with horn antennas have stronger echoes and higher accuracy (0.2% ~1% f.s).

　　Radar level gauge application range 2, powder materials. Cement plants or crushing plants generally have 4-8 cement silos and raw material homogenization and fly ash silos, all of which are powders. The powder surface is very loose, and microwave reflection is quite difficult. If a radar level gauge is not used, the material level is difficult to measure.

　　For powder materials, a non-contact radar level gauge with a large flange and a horn antenna can be selected. This essentially connects the cable to both the antenna and the waveguide simultaneously.

　　Microwave pulses are sent from the probe and then transmitted along the cable. When the pulse encounters the material surface, it is reflected within a range of 35 meters. The dielectric constant of the substance under test is at least 1.6, and the wear resistance and maximum tensile strength of other cables meet the detection requirements of various powder silos in cement plants.

　　Currently, many cement plants have achieved good results in measuring the material level of homogenization silos, cement silos, and fly ash silos using cable radar level gauges.