Structure diagram of guided wave radar level gauge

The guided wave radar level meter adopts the contact measurement method, and the probe with metal rod or flexible cable needs to be installed from the top of the tank to the bottom of the tank. When the radar level meter is working, the high-frequency electromagnetic wave propagates downward along the outside of the probe. When it hits the material surface, due to the difference between the dielectric constant ε and the air dielectric constant, it will reflect and be received by the antenna. The TOF (Time of Flight, travel time) principle can measure the material level. In the measurement method of the guided wave radar level meter, the electromagnetic wave propagates along the probe without diffusion, and can be used in a long and narrow container without more disturbing reflections. Moreover, due to the concentration of energy, the guided wave radar level meter can measure the level of materials with low dielectric constant (ε≥1.2), such as liquefied gas, etc., and can also measure the level of powder or granular materials. The structure of the guided wave radar level gauge will be introduced in detail below. The guided wave radar level meter is generally composed of three modules, namely the communication and display module, the signal measurement module and the signal processing module. 1. Communication and display module This module of the guided wave radar level gauge is mainly to realize the display of real-time level and set various functional parameters, and to communicate with external equipment through HART protocol. Structure Including microprocessor, liquid crystal display, and HART (Highway Addressable Remote Transducer, addressable remote sensor high-speed channel) protocol communication interface. 2. Signal measurement module This type of module of the guided wave radar level meter can mainly complete the transmission and reception of high-frequency electromagnetic waves. The structure includes pulse transmission and reception circuits, probes and corresponding flange connections. 3. Signal processing module The signal processing module is to complete the signal generation, amplification, filtering and inspection, and then send the signal to the microprocessor for processing and operation. This type of module structure of the guided wave radar level meter mainly includes a pulse generation circuit, an echo filter amplification and shaping circuit, and a peak detection circuit. The structure of the guided wave radar level meter mainly includes four parts: electronic meter, process connection, waveguide rod and probe. Among them, the process connection includes flange connection and threaded connection, which is suitable for measuring most of the connection containers and storage. Levels in tanks, process vessels and bypass vessels, measured temperature and pressure are limited to the probe's rated temperature and pressure range. While using the product, users can solve problems in time after understanding the structure to ensure that the working conditions will not be affected

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