Analysis of the development advantages of 120G radar level/gauge
Thread Content
The general technical principle of the 120G frequency-modulated continuous-wave radar level gauge is that the radar emits electromagnetic waves from the top of the tank; these waves are reflected by the medium and then received by the radar system. The frequency difference δf between the received data signal and the transmitted signal is proportional to the distance R from the surface of the medium, according to the formula R = C (speed) * δf (frequency difference) / 2 / K (frequency modulation slope). Since the speed of light C and the frequency modulation slope K are known, by estimating the frequency difference δf, it is possible to determine the safety distance R from the radar installation location to the material surface. By then analyzing the known total height of the tank and subtracting the design distance between the radar and the material surface (referred to as the clearance height), the level of the material can be determined. The product and service support four-wire and two-wire applications. There are multiple **models; the product can reach a maximum range of 120m, and the blind spot can be reduced to as little as 5-8cm. Due to the higher frequency requirements and shorter wavelengths necessary for its operation, we particularly need a design suitable for solid-state applications in our country; such a design, which utilizes lenses to transmit and receive electromagnetic waves, has unique advantages in environments with high dust levels and severe temperature control challenges (up to 200°C). Instrument manufacturers offer flanged or threaded fittings, which makes construction and installation easier and simpler. The main advantages of the 120G radar level gauge are as follows: 1. Based on self-developed CMOS millimeter-wave RF chips, it features a more compact RF structure, a higher signal-to-noise ratio, and smaller blind zones. The 2.5GHz operating bandwidth enables the product to achieve a higher measurement resolution and greater accuracy in the measurement data. 3. The narrowest 3° antenna beam angle and the minimal impact of interference in the installation environment result in easier installation. 4. With a shorter wavelength, reflection from the solid surface is better, so no special gimbal flange is required for aiming. 5. Supports remote debugging and remote upgrading, reducing wait times and improving work efficiency. 6. It supports Bluetooth debugging via mobile phones, facilitating maintenance, communication, and debugging by on-site personnel. For on-site management, it is possible to analyze and debug the instrument system through the LCD, or to carry out design and debugging on a PC using the optional host computer software. Radar level gauge communicates with the PC: 1. USB-to-RS485 serial cable (four-wire) ； 2. USB to TTL serial cable (two-wire system). 3. USB to Hart modem for communication (two-wire system). It can also be debugged via Bluetooth using a smartphone, making on-site debugging safer and more convenient. Remote debugging from another location is also possible via the 4G network of the remote module. For more questions regarding the selection of 120G radars, feel free to leave a message; industry professionals are also welcome to share their insights—enabling the visualization of media
Problems in application and teaching methods for solutions: Under certain operating conditions of radar level gauges, issues arise due to improper installation or conditions of the sensors. The following are some of the problems encountered during use, for your reference. 1. Raising the probe installation height is one method to address probe scarring and common faults; however, in situations where the installation conditions do not allow for such an increase, the issue can be resolved by interlocking the liquid level of the material being measured with the pump inside the tank. When the liquid level reaches a certain high value, this set point can be reduced by about 0.5 m, thereby allowing the feed pump to stop or the discharge pump to start. 2. Regarding the impact of foam on measurements: Dry and wet foam can reflect radar waves without affecting measurements, whereas neutral foam absorbs and scatters radar waves, thereby severely affecting the reflection of echoes or even resulting in no echoes at all. When the medium surface is covered with thick foam, the measurement error is large or measurement becomes impossible. Under such circumstances, radar level gauges have no advantage, which is a limitation of their application. 3. Treatment of antenna scarring: Suspensions with a low dielectric constant have no impact on measurements when dry, whereas those with a high dielectric constant do affect the measurements. Compressed air can be used for purging (or rinsing with clean water), and cooled compressed air can reduce the temperature of flanges and electrical components. Acidic cleaning solutions can also be used to clean alkaline scabs, but the material level cannot be measured during the cleaning process.