Installation and Maintenance of Guided Wave Radar Level Gauge

The radar level gauge emits a very narrow microwave pulse through the antenna. This pulse propagates in space at the speed of light, and the part of the pulse wave that encounters the surface of the measured medium is reflected back and received by the same antenna. The time interval between the transmitted pulse and the received pulse is proportional to the distance from the antenna to the surface of the measured medium. The high-frequency radar level gauge adopts a special algorithm, which can accurately identify the time interval between the transmitted pulse and the received pulse, so as to further calculate the distance from the antenna to the surface of the measured medium. When an antenna transmits microwave pulses, it has a certain emission angle. From the lower edge of the antenna to the surface of the measured medium, there should be no obstacles in the area radiated by the transmitted microwave beam. Therefore, the installation should be avoided as far as possible from the facilities in the tank, such as: people ladders, limit switches, heating equipment, brackets, etc. When necessary, 'false echo learning' shall be performed. Also note that the microwave beam must not intersect the feed stream. When installing the instrument, also pay attention to: the highest material level shall not enter the measurement blind area; the instrument must keep a certain distance from the tank wall; the installation of the instrument should make the emission direction of the antenna perpendicular to the surface of the measured medium as much as possible. Instruments installed in explosion-proof areas must comply with the national installation regulations for explosion-proof hazardous areas. . The explosion-proof instrument can be installed in the occasions with explosion-proof requirements, and the instrument must be connected to the ground. 1. Installation method 1. The distance between the installation position and the tank wall is recommended to be 1/6-1/4 of the tank diameter (at least 300mm, at least 400mm for concrete tanks). Do not install it in the middle of the metal tank. Do not install it at the discharge port. When selecting the length of the probe , Note that the probe bottom is more than 30mm from the tank bottom, pay attention to the medium temperature. 2. When installing obstacles in the tank, pay attention to the distance between the probe and the obstacles at least 200mm. 3. Elimination of interference Interference echo suppression: The software can suppress the interference echo, so as to achieve the ideal measurement effect. Bypass pipe and waveguide (only for liquid) can be used for the viscosity less than 500cst. , still-pipe or tube type to avoid interference. 4. Liquid standard installation: for the medium with viscosity ≤500cst and not easy to produce adhesion, the tube probe is a good solution, and its characteristics are as follows: reliability can be used for any medium with a dielectric constant greater than or equal to 1.4, measuring the conductivity of the medium Regardless of the obstacles in the tank and the size of the short pipe, it does not affect the measurement. The lateral pressure can be higher than that of the rod probe. For the medium with high viscosity, it is recommended to use the rod probe. 2. Troubleshooting 1. The treatment of probe scarring will improve the installation position of the probe, but sometimes the installation conditions are limited and cannot be improved, the method of interlocking the liquid level measurement value with the pump of the tank should be used to solve this problem. One problem: reduce the set value of the liquid level by about 0.5m. When the liquid level reaches the high value, the feeding pump can be stopped or turned on. 2. The influence of foam on measurement Dry foam and wet foam can reflect radar waves back and have no effect on measurement; neutral foam will absorb and diffuse radar waves, thus seriously affecting the reflection of echoes or even no echoes. When the surface of the medium is thick and thick foam, the measurement error is large or cannot be measured. In this case, the radar level gauge has no advantage, which is the limitation of its application. 3. The treatment of antenna scarring The hanging material with a small dielectric constant has no effect on the measurement in a dry state, while the hanging material with a high dielectric constant has an impact on the measurement. It can be purged with compressed air (or flushed with clean water), and the cooled compressed air can reduce the temperature of flanges and electrical components. Alkaline scars can also be cleaned with an acid cleaning solution, but level measurement cannot be performed during cleaning. 4. Corresponding treatment method for flooding The solution is to change the radar level gauge to still-pipe measurement. The still-pipe radar level gauge is still installed at the original opening, and the still-pipe is about 0.2m higher than the exhaust pipe. In this way, even if the slurry overflows from the exhaust pipe in a bad working condition, it will not cause the liquid to leak. The level meter antenna is submerged by the slurry, and the interference of the eddy current of the stirrer and a large amount of steam coming out of the probe are avoided, which reduces the damage to the probe. Related product links: 80GHz radar level gauge 922.html
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