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Focus On Level Measurement
The principle, advantages and disadvantages of guided wave radar level gauge
Compared with other radar level gauges, guided wave radar level gauges have different working principles, but also have their own advantages and disadvantages. Users, especially purchasers, understand this information, which is very important for correct selection. Below, the principle, advantages and disadvantages of the guided wave radar level gauge are specifically introduced as follows.
1. The working principle of the guided wave radar level gauge
The working principle of the guided wave radar level gauge is a measuring instrument based on the time travel principle. 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.
The working principle of ordinary radar level gauges is transmission-reflection-reception. Specifically, the antenna of the radar sensor transmits electromagnetic wave signals in the form of beams, and the transmitted 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.
Second, the advantages and disadvantages of guided wave radar level gauge
1. Insufficiency of guided wave radar level gauge
1.1. It is not suitable for measuring corrosive and adhesive liquids, nor is it suitable for occasions with high food grade requirements
From the different working principles of the two radar level gauges, it can be known that the radar level gauge is a non-contact measurement, and the guided wave radar level gauge is a contact measurement. Therefore, it is necessary to consider the corrosiveness and adhesion of the medium, and the guided wave radar level gauge is generally not used in the occasions with higher food grade requirements.
1.2. Inconvenient installation and maintenance of the guided wave radar level gauge
When measuring the guided wave radar level gauge, the too long probe (cable) adds a lot of difficulties to installation and maintenance. Moreover, compared with ordinary radar level gauges that can be used interchangeably, the length of the probe (cable) of the guided wave radar level gauge is fixed according to the working conditions, and generally cannot be used interchangeably. Therefore, in general, the selection and maintenance of guided wave radar level gauges are much more cumbersome than ordinary radar level gauges.
1.3. The measuring distance of the guided wave radar level gauge is limited
The measuring distance of the guided wave radar level gauge will not be very long, while the ordinary radar level gauge is more commonly used on tanks of 30-40m, and can even measure up to 60m.
2. Advantages of guided wave radar level gauge:
2.1. The measurement of the medium with large fluctuations is more stable
Under the working conditions where there is stirring in the tank and the medium fluctuates greatly, the guided wave radar level gauge fixed at the bottom is more stable than the ordinary radar level gauge, and the advantages are more obvious.
2.2. is more suitable for the measurement of materials in small tanks
When measuring the level in a small tank, due to the small installation and measurement space (or more interference in the tank), the general radar level gauge is not applicable, and the guided wave radar level gauge is not limited.
2.3. Guided wave radar level gauge is not limited by the dielectric constant
The measurement principles of ordinary radar level gauges and guided wave radar level gauges are based on the difference in dielectric constant of the medium. Because the waves emitted by ordinary radar level gauges are divergent, when the dielectric constant of the medium is too low, If the signal is too weak, the measurement will be unstable, and the wave emitted by the guided wave radar level gauge propagates along the probe, and the signal is relatively stable.