Radar level gauge, ultrasonic level gauge, magnetic flap level gaugeThe main difference between ultrasonic level gauge and radar level gaugeAcoustic waves are mechanical waves that reflect on the interface with large density (gas-liquid-solid) changes. The propagation depends on the medium, and the temperature and pressure are measured.The impact is large, and temperature compensation should be introduced. Generally not suitable for high temperature or pressure measurement. First of all, the ultrasonic level meter has a temperature limit. Generally, the temperature at the probe cannot exceed 80 degrees, and the speed of the sound wave is greatly affected by the temperature. Secondly, the ultrasonic level gauge is greatly affected by pressure, generally within 0.3 MPa, because ultrasonic waves are emitted through the vibration of piezoelectric materials, and the sound-producing parts will be affected when the pressure is too high. Third, when the measurement environment is very foggy or dusty, it will not be able to measure well.The radar probe sends out high-frequency pulses and propagates along the cable. When the pulses meet the surface of the material, they are reflected back and received by the receiver in the instrument, and the distance signal is converted into a level signal. The electromagnetic wave is used as the detection signal and reflected at the interface where the dielectric constant changes. The electromagnetic wave can propagate in vacuum and is basically not affected by temperature and pressure changes, so it can be used in high temperature and high pressure situations. Not suitable for the measurement of very low dielectric constant media.Radar is electromagnetic wave, not affected by vacuum, and has a wide range of application to medium temperature and pressure. With the advent of high-frequency radar, its application range is more extensive, so in level measurement, radar is a very good one. Choice.Other distinguishing performance1. The radar measurement range is much larger than that of ultrasound. The launch angle of radar is larger than that of ultrasonic. Non-contact radar is not recommended for small containers or elongated containers. Guided wave radar is generally recommended.2. Radar has horn type, rod type, cable type, and can be applied to more complicated working conditions than ultrasonic.3. Ultrasonic accuracy is not as good as radar. High-precision radar must be used on the tank instead of ultrasonic.4. The relative price of radar is relatively high. Under normal circumstances, ultrasonic is lower than radar. Of course, the price of some large-range ultrasonics is also very high, such as the range of 6 to 70 meters. At this time, the radar can’t reach it, so you can only choose ultrasonic!5. When using radar, consider the dielectric constant of the medium.6. Ultrasonic cannot be used in working conditions such as vacuum, high steam content or foam on the liquid surface.Explanation of related entries in this articleUltrasoundUltrasound We know that when an object vibrates, it makes a sound. Scientists call the number of vibrations per second the frequency of sound, and its unit is hertz. The frequency of sound waves that our human ears can hear is 20 to 20,000 Hz. When the vibration frequency of the sound wave is greater than 20000 Hz or less than 20 Hz, we cannot hear it. Therefore, we call sound waves with a frequency higher than 20000 Hz as “ultrasound.” The frequency of ultrasound usually used for medical diagnosis is 1 to 5 MHz. Ultrasound has the characteristics of good directionality, strong penetrating ability, easy to obtain concentrated sound energy, and long distance in water. It can be used for distance measurement, speed measurement, cleaning, welding, stone crushing, etc. There are many applications in medicine, military, industry, and agriculture. Theoretical research shows that under the same amplitude conditions, the energy of an object’s vibration is proportional to the vibration frequency. When the ultrasonic wave propagates in the medium, the frequency of the medium particle vibration is very high. Therefore, the energy is great. In the dry winter in northern my country, if ultrasonic waves are passed into the water tank, the violent vibration will break the water in the tank into many small droplets, and then use a small fan to blow the droplets into the room, which can increase the indoor air humidity. This is the principle of ultrasonic humidifiers. Diseases such as pharyngitis and bronchitis call for the blood to reach the diseased part. Using the principle of a humidifier to atomize the liquid medicine for the patient to inhale, the curative effect can be improved. Utilizing the huge energy of ultrasound can also make the stones in the human body undergo violent forced vibration and break, thereby alleviating the pain and achieving the purpose of healing.radarThe emergence of the radar screen radar is due to the fact that during the war between Britain and Germany during World War II, the United Kingdom urgently needed a radar (technology) that could detect metal objects in the air to help search for German aircraft in anti-air strikes. During World War II, radar technology with surface-to-air, air-to-ground (search) bombing, air-to-air (intercept) fire control, and identification of friend or foe had already appeared. After World War II, radar has developed monopulse angle tracking, pulse Doppler signal processing, high resolution of synthetic aperture and pulse compression, combined system with identification of friend or foe, automatic fire control system combined with computer, terrain avoidance and terrain following, no Source or active phased array, frequency agility, multi-target detection and tracking and other new radar systems. Later, with the scientific progress in various fields such as microelectronics and the continuous development of radar technology, its connotation and research content are constantly expanding. The detection method of radar has been developed from the previous only radar detector to the fusion and cooperation of infrared light, ultraviolet light, laser and other optical detection methods. There is also a psychosensory radar that can react to human brain waves and perceive the signs of human life. The simultaneous multi-function capabilities of early radars and contemporary radars enabled battlefield commanders to scan targets in various search/tracking modes and automatically correct interference errors, and most of the control functions were completed within the system. Automatic target recognition can maximize the effect of weapon systems. Comprehensive radar systems such as airborne early warning aircraft and JSTARS capable of identifying friend or foe on the battlefield have actually become the information command center on the battlefield in the future.Level gauge
The height of the liquid medium in the container is called the liquid level, and the meter that measures the liquid level is called a level gauge. The level gauge is a kind of level gauge. Magnetic float level gauges are also called magnetic flap level gauges, magnetic flip level gauges, and magnetic float level gauges.
Post time: 21-09-21