This article gives a detailed introduction to the radar level gauge and the guided wave radar level gauge, so that users can better understand their differences.Working principle: Transmit-reflect-receive is the radar level gauge. The antenna of the radar sensor emits electromagnetic wave signals in the form of beams, and the emitted waves are reflected on the surface of the material to be measured, and the reflected echo signals are still received by the antenna. Every point in the transmitted and reflected beams is collected by ultrasonic sampling. After the signal is processed by the intelligent processor, the distance between the medium and the probe is obtained, and it is sent to the terminal display for display, alarm, operation, etc.Features:The characteristic of the radar level gauge is that it is effective in harsh conditions. Whether it is a toxic medium or a corrosive medium, whether it is a solid, liquid, dusty or slurry medium, it can be measured. In terms of measurement, it has the following characteristics:1. Continuously and accurately measure the probe of the radar level gauge without contact with the surface of the medium, which is a non-contact measurement, which can accurately and quickly measure different mediums. The probe is hardly affected by temperature, pressure, gas, etc. (the effect is only 0.018% at 500°C, and 0.8% at 50bar).2. It has the function of suppressing interference echo3. Accurate and safe energy savingThe chemical and mechanical properties of the materials used in the radar level gauge are quite stable, and the materials can be recycled, which is extremely environmentally friendly.4. No maintenance required and strong reliabilityThe microwave is almost free from interference and does not directly contact the measuring medium. It can be used in almost various occasions, such as vacuum measurement, liquid level measurement or material level measurement. Due to the use of high-quality materials, it is very durable against extremely complex chemical and physical conditions. It can provide accurate, reliable, long-term stable analog or digital level signals.5. Convenient maintenance and simple operation. The radar level gauge has fault alarm and self-diagnosis functions. Analyze the fault according to the error code prompted by the operation display module, determine the fault in time and eliminate it, so that the maintenance and correction are more convenient and accurate, and the normal operation of the instrument is guaranteed.6. A wide range of applications, almost all media can be measuredIn terms of the shape of the tank body, the radar level gauge can measure the liquid level of spherical tanks, horizontal tanks, cylindrical tanks, cylindrical cones, etc.; in terms of tank functions, it can measure the liquid level of storage tanks and buffer tanks. , Microwave tube, the liquid level in the by-pass tube; from the measured medium, liquid, particle, slurry, etc. can be measured.The radar level gauge has a wide range of use and is a non-contact measurement method. The material is excellent and the failure rate is low.Principle: Guided wave radar level gauge is a measuring instrument based on the principle of time travel. The radar wave runs at the speed of light, and the running time can be converted into a level signal by electronic components. The probe sends out high-frequency pulses and propagates along the cable probe. When the pulses meet the surface of the material, they are reflected back and received by the receiver in the meter, and the distance signal is converted into a level signal.Features:It has a strong ability to suppress steam and foam, and the measurement is not affected;Not affected by the density of the liquid, the degree of looseness of solid materials, temperature, and dust during feeding;Low maintenance, high performance, high precision, high reliability and long service life.The above is a detailed product introduction of the radar level gauge and the guided wave radar level gauge, so is there any difference between them? The following is an example.Difference 1: Different contact methodsRadar level gauge is non-contact type, while waveguide type level gauge is contact type.That is to say, the pilot type cannot be used in the occasions with higher food grade requirements.Difference 2: Different working condition mediaGuided wave radar level gauges need to consider the corrosiveness and adhesion of the medium, and it is more difficult to install and maintain a long guided wave radar.In low dielectric constant conditions, the measurement principle of both radar and guided wave radar is based on the difference in dielectric constant of the medium. Since the waves emitted by ordinary radars are divergent, when the dielectric constant of the medium is too low, the signal is too weak to measure. Stable, while the guided wave radar wave propagates along the probe relatively stable signal. In addition, the general guided wave radar also has a bottom detection function, which can be corrected according to the measured value of the bottom echo signal to make the signal more stable and accurate.Difference 3: The selection is differentOrdinary radars can be used interchangeably, while guided wave radars are generally not interchangeable because the length of the probe (cable) is fixed according to the original working conditions. Affected by this, the selection of guided wave radars is more troublesome than ordinary radars.Difference 4: Different measuring rangesOrdinary radars are commonly used on tanks of 30 and 40 meters, and can even measure up to 60 meters.Guided wave radar also considers the force of the probe (cable), which is also due to the force. Generally, the measurement distance of guided wave radar is not very long.However, guided wave radar has obvious advantages in some special working conditions, such as stirring in the tank and large fluctuations in the medium. In such working conditions, the measured value of the guided wave radar with a fixed bottom is more stable than that of a flexible radar;There is also the level measurement in the small tank. Due to the small installation and measurement space (or more interference in the tank), the general radar is not applicable. At this time, the advantages of the guided wave radar appear.Difference 5: different stylesThe radar level gauge is in the shape of a bell mouth, while the pilot level gauge has a probe.The two shapes are different and naturally there will be differences in some use occasions.
Both are used in liquid level measurement in different industries and fields. Through the above introduction, users should have more understanding of the difference between the two.
Post time: 21-09-21