In this article, we will give 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-reflection-receive is the radar level gauge. 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 acquired by 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 sent for display, alarm, operation, and the like.
The radar level gauge* is characterized by its remarkable efficacy under harsh conditions. Whether it is a toxic medium, a corrosive medium, or a solid, liquid or dusty, 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. It is a non-contact measurement and can measure different media accurately and quickly. The probe is almost immune to temperature, pressure, gas, etc. (only 0.018% at 500 Â°C and 0.8% at 50 bar).
2, has a suppression function on the interference echo
3, accurate and safe energy saving
Radar level gauges are chemically and mechanically stable, and the materials can be recycled for environmental protection.
4, no maintenance and high reliability
The microwave is almost undisturbed and does not directly contact the measuring medium. It can be used in almost any application, such as vacuum measurement, liquid level measurement or level measurement. Due to the use of superior materials, it is extremely durable in chemical and physical conditions, which can provide accurate, reliable and long-term stable analog or digital level signals.
5, easy to maintain, easy to operate
The radar level gauge has a fault alarm and self-diagnosis function. According to the error code prompted by the operation display module, the fault is analyzed, and the fault is eliminated in time to make the maintenance correction more convenient and accurate, and the normal operation of the instrument is guaranteed.
6, a wide range of applications, almost all media can be measured
From the shape of the tank body, the radar level gauge can measure the liquid level of the spherical tank, the horizontal tank, the cylindrical tank, the cylindrical vertebral can, etc.; from the tank function, the tank and the buffer tank can be The liquid level in the microwave tube and the bypass tube is measured; from the measured medium, the liquid, the particles, the slurry, etc. can be measured.
The radar level gauge has a wide range of uses and is a non-contact measurement method. Excellent material and low failure rate.
Principle: The guided wave radar level gauge is a measuring instrument based on the principle of time and 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 emits high frequency pulses and propagates along the cable probe. When the pulse encounters the surface of the material, it is reflected back and received by the receiver in the meter, and the distance signal is converted into a level signal.
Strong resistance to steam and foam, measurement is not affected;
Not affected by the density of the liquid, the degree of looseness of the solid material, the temperature, and the dust during the feeding;
Low maintenance, high performance, high precision, high reliability and long service life.
The above has made a detailed product introduction for the radar level gauge and the guided wave radar level gauge. So, do they have any difference? The following example shows.
Difference 1: Different ways of contact
The radar level gauge is non-contact and the waveguide level gauge is contact type.
That is to say, in the case where the food grade is required to be high, the pilot type cannot be used.
Difference 2: Different working conditions media
Guided wave radar level gauges need to consider the corrosiveness and adhesion of the medium, and the installation and maintenance of too long guided wave radar is more difficult.
Low dielectric constant conditions, whether radar or guided wave radar measurement principle is based on the dielectric constant difference of the medium, because the wave emitted by ordinary radar is divergent, when the dielectric constant of the medium is too low, the signal is too weak to measure Stable, and the guided wave radar wave is relatively stable along the probe. 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, so that the signal is more stable and accurate.
Difference 3: The selection is different
Ordinary radars can be used interchangeably, and guided wave radars are generally not interchangeable because the length of the probes (cables) is fixed according to the original working conditions, and the selection of guided wave radars is more troublesome than ordinary radars.
Difference 4: Different measurement range
Ordinary radar is more common in tanks of 30 and 40 m, and even 60 m can be measured.
The guided wave radar also needs to consider the force of the probe (cable), and it is also because the force measurement is generally not long.
However, in some special working conditions, the guided wave radar has obvious advantages, such as stirring in the tank and large fluctuation of the medium. The measured value of the guided wave radar fixed at the bottom is more stable than that of the modified radar;
There is also the measurement of the level in the small tank. Because the installation measurement space is small (or there are more disturbances in the tank), the general radar is not applicable, and the advantage of the guided wave radar is revealed.
Difference 5: Different styles
The radar level gauge is shaped like a bell mouth, while the pilot level gauge has a probe.
The two shapes are different and will naturally differ in some applications.
Both are used for level measurement in different industries and fields. Through the above introduction, users should have more understanding of the difference between the two.
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