The difference between radar level gauge and guided wave radar level gauge
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October 12 09:00:45, 2024
Radar level gauge
Principle: Launch-reflection-reception is the basic working principle of radar level gauges.
The antenna of the radar sensor emits an electromagnetic wave signal in the form of a beam, and the emitted wave is reflected on the surface of the measured material, and the reflected echo signal is still received by the antenna.
Each point in the transmitted and reflected beams is collected using ultrasonic sampling. After the signal is processed by the intelligent processor, the distance between the medium and the probe is obtained, and the terminal display is displayed, alarmed, and operated.
Features: The biggest feature of radar level gauge is its remarkable performance under harsh conditions. Both toxic and corrosive media, as well as solid, liquid and dusty, pulpy media, can be measured. In terms of measurement, it has the following characteristics:
1, continuous and accurate measurement
The probe of the radar level gauge has no contact with the surface of the medium and is a non-contact measurement. It can accurately and quickly measure different media. The probe is hardly affected by temperature, pressure, gas, etc. (only 0.018% at 500°C and 0.8% at 50bar).
2. It has the function of suppressing interference echo
3, accurate and safe to save energy
The chemical and mechanical properties of materials used in radar level gauges are quite stable, and the materials can be recycled, which is highly environmentally friendly.
4, no maintenance and strong reliability
The microwave is almost undisturbed, and it is not in direct contact with the measurement medium. It can be used in almost every application, such as vacuum measurement, level measurement, or material level measurement. Due to the use of advanced materials, it is extremely durable for extremely complex chemical and physical conditions. It can provide accurate and reliable long-term stable analog or digital level signals.
5, easy maintenance, easy operation
Radar level gauge has fault alarm and self-diagnosis function. According to the error code indicated by the operation display module, the fault is analyzed, and the fault is determined and eliminated in time, so that the maintenance calibration is more convenient and accurate, and the normal operation of the instrument is ensured.
6, a wide range of applications, almost all media can be measured
In terms of the shape of the tank body, the radar level gauge can measure the liquid level of a spherical tank, a horizontal tank, a cylindrical tank, a cylindrical vertebral body tank, etc.; in terms of the tank function, it can be a tank, a buffer tank The liquid level in the microwave tube and the bypass tube is measured; from the measured medium, the liquid, particle, slurry, etc. can be measured.
summary:
In general, radar level gauges use a wide range of non-contact measurement methods. Excellent material, low failure rate.
Guided wave radar level gauge
Principle: The guided wave radar level gauge is a measuring instrument based on the principle of time travel. The radar wave operates at the speed of light. The operating time can be converted into a level signal via electronic components. The probe emits high-frequency pulses and propagates along the cable probe. When the pulse meets the surface of the material, it is reflected back by the receiver in the meter and converts the distance signal into a level signal.
Features
1, has a strong ability to inhibit steam and foam, the measurement is not affected;
2. It is not affected by the liquid density, the looseness of solid materials, the temperature, and the dust at the time of feeding;
3, low maintenance, high performance, high precision, high reliability, long service life.
Is there any difference between them?
Different contact modes: The radar level gauge is non-contact, and the waveguide level gauge is contact type. In other words, if the food grade requirement is high, it cannot be piloted.
The working medium is different: The guided wave radar level gauge needs to consider the corrosivity and adhesion of the medium, and it is more difficult to install and maintain the long guided wave radar. In low dielectric constant conditions, whether the radar or guided wave radar measurement principle is based on the dielectric constant difference of the dielectric, since the emitted wave of the ordinary radar is divergent, when the dielectric constant of the dielectric is too low, the signal is too weak to measure Stability, and guided wave radar wave is relatively stable along the probe propagation signal, in addition to the general guided wave radar has a bottom detection function, according to the bottom echo signal can be measured to correct, so that the signal is more stable and accurate.
Different types of selection: ordinary radar can be used interchangeably, and guided wave radar because the length of the probe (cable) is fixed according to the original working conditions, generally can not be used interchangeably, affected by the selection of guided wave radar than ordinary radar trouble .
The measurement range is different: Ordinary radar is commonly used in 30 and 40m cans, and even 60m can be measured. Guided wave radar also needs to consider the force of the probe (cable), but also due to the force of the reason the general use of guided wave radar measurement distance will not be very long. However, in some special conditions, the guided wave radar has obvious advantages, such as stirring in the tank and large fluctuations in the medium. In such conditions, the measured value of the bottom fixed guided wave radar is more stable than that of the variable radar; Level measurement, due to the installation of small measurement space (or more interference within the tank), the general radar is not applicable, then the advantage of guided wave radar is revealed.