Rosemount 5300 guided wave radar antenna
Thread Content
Today, for the first time on site, I saw that the Rosemount 5300 guided-wave radar antenna was covered with a layer of plastic (it could also be PTFE). If the antenna is isolated from the medium in this way, how can the liquid level be measured? I would appreciate your advice as well. Thank you.
Guided wave radar sends out high-frequency pulses through a cable-based probe; when these pulses encounter the surface of the material, they are reflected back and captured by a receiver inside the instrument, which then converts the distance signal into a level signal.
For guided-wave radar to measure a medium, it is necessary that the medium have a relatively high dielectric constant; the dielectric constant of this plastic coating is very low, so no measurement can be made by default
For guided-wave radar, as can be seen from the image, a guide cable is used; the signal should propagate along this guide cable……
For guided-wave radar, as can be seen from the image, a guide cable is used; the signal should propagate along this guide cable……
The insulating layer does not affect the operation of the guided-wave radar. According to Maxwell’s theory of electromagnetic fields, a changing electric field generates a changing magnetic field, and a changing magnetic field in turn generates a changing electric field. The waves that are produced by this alternating pattern of changing electric and magnetic fields are known as electromagnetic waves ； Physical properties of electromagnetic waves: When they travel from medium 1 to medium 2, if the dielectric constant of medium 2 is greater than that of medium 1, the electromagnetic waves are reflected ； There is also refraction and diffraction. The device sends low-energy microwave pulses along the waveguide rod. When the pulse hits the medium, a significant portion of the energy is reflected back into the waveguide and transmitted into the device. The level is proportional to the time-domain reflection measurement results. Since a portion of the emitted pulse continues to propagate along the waveguide, the interface can also be detected. Guided wave radar is a type of microwave level gauge that utilizes microwave (radar) positioning technology. Since microwaves are only affected by materials that reflect energy, this means that temperature fluctuations, dust, pressure, and viscosity do not affect their accuracy. As long as the insulating layer of the waveguide rod does not reflect microwaves, it will not affect the operation of the waveguide radar.
This post was last edited by liu530014416 on 2022-2-26 20:17; it should be a conductive coating. With your newly installed gauge, the gauge on the empty tank shows 30–40 cm, which is the height of the weight; everything is normal when there is material present, or you can set a threshold voltage that is higher than that of an empty tank.
The director’s radar is available in both rigid rod and flexible cable versions, with no issues in measurement