Radar level gauge (5100-8)

Dinghua G80, a new generation 80G FM radar level gauge. By using frequency modulated continuous wave (FMCW) technology, combined with Dinghua's "ELL signal analysis technology" and "small blind spot" technology, it can effectively eliminate or reduce the influence of multiple echoes, false echoes and other interference signals, greatly improving the stability of the product and keeping it in use at all times. With a beam angle of 3 ° and a very small antenna design, it can also achieve measurement results in complex working conditions such as internal components, mixing devices and compact containers. The Dinghua G80 frequency modulated radar level gauge is currently widely used in various industries such as pharmaceuticals, chemicals, food, energy and water conservancy for highly accurate level measurement of various media.

Measuring principle

The G80 FM radar level gauge is a "top-down" measurement system based on the principle of frequency modulated continuous wave (FMCW). The antenna emits electromagnetic waves with continuously changing frequencies towards the medium, and the electromagnetic waves reflect off the surface of the medium, and the reflected echoes are received by the antenna again.

FMCW principle: emission and reflection of continuous waves

R: The highest point of level measurement

H: Total distance for level measurement

FMCW principle

1. Transmit signal 2. Receive signal

Therefore, there is a frequency difference between the transmitted and received signals at any point in time

△ f=k * △ t, where △ t is the operating time of the electric shock wave and k is the material abundance of frequency modulation. At is related to distance D: D=At * C/2, where C is the speed of light. Therefore, D can be calculated based on the measured frequency difference △ f. Based on D, determine the actual level height inside the tank.

Eight Characteristics

Reliability: ELL signal analysis technology can reduce the impact of various false echoes and ensure high product reliability.

Safety: Designed and produced based on the IEC61508 standard to ensure high product safety.

High precision: Using FMCW frequency modulation technology, the product accuracy can reach up to ± 1mm.

Dual cavity shell: realizes circuit cavity isolation to ensure on-site electrical safety.

Wavelet beam angle: 3 ° wavelet beam angle technology greatly improves anti-interference ability.

Small blind spot: Small blind spot technology, the minimum blind spot of the product can reach 2cm.

High bandwidth: 5GHz bandwidth technology ensures product resolution and high signal-to-noise ratio.

Millimeter level wavelength: Millimeter wave technology has the ability to penetrate smoke, dust, and fog, making it suitable for use in complex working conditions.

technical advantage

Remote debugging: After adding a remote communication module, Dinghua G80 can achieve remote debugging.

Ultra large range: The maximum range of Dinghua G80 can reach 120 meters.

High temperature resistance: Dinghua G80 can measure high temperature media up to 200 ℃.

Multiple output modes: Dinghua G80 can choose from 4~20mA, HART, Modbus and other output modes.

Ultra small antenna: The Dinghua G80 can be installed on the threaded mouth of G1 half at a minimum.

Scope of application

Dinghua G80 FM radar level gauge is suitable for level measurement of liquid and solid media. The application scope includes media with a dielectric constant greater than 1.4, such as aqueous media, hydrocarbons, liquid gases, solid particles, etc.

The non-contact, continuous output, and multiple antenna types of the product meet the installation and use requirements of various working conditions. For example, highly corrosive nitric acid storage tanks, liquid chlorine storage tanks with a dielectric constant of only 1.5, paraffin tanks with agitation, PVC monomer storage tanks that are prone to crystallization, and so on.

Typical Case

A chemical plant in Jiangsu - liquid chlorine storage tank

Liquid chlorine is usually stored in high-pressure and low-temperature environments, with temperatures around -20 ℃ and pressures around 1MPa. Due to the relatively small dielectric constant of liquid oxygen (around 1.5), the measurement performance of conventional 26G radar products is not ideal, and signal loss often occurs. The level gauge of Dinghua G80 FM radar has significantly enhanced signal strength compared to 26G radar, and the measurement effect of any dielectric constant medium has been greatly improved. This case proves that the Dinghua G80 FM radar level gauge can be used in low dielectric constant conditions

A chemical plant in Henan - hydrogenated paraffin wax

The working conditions of chlorinated paraffin reaction salt for users are relatively complex, with stirring and high process temperature, and the medium is prone to crystallization. The user's previous audio performance was not good: the crystal often wrapped the Jinda antenna, causing the instrument to lose signal; And when stirring is turned on, Maoda often receives interference signals. Later, the Dinghua G80 FM Luda level gauge was replaced to solve the above problem. The signal of the FM continuous Boeing level gauge is strong and can penetrate through crystal measurements; And the beam angle is small, which can effectively avoid the stirring fan blades; The use of Dinghua's proprietary signal analysis technology has solved the problem of interference signals. This case proves that the Dinghua G80 FM radar level gauge can be used in working conditions with stirring and easy crystallization

A chemical plant in Shanxi - acetylene gas holder

Accurate measurement of gas holder level is one of the important means to ensure stable acetylene flow, but its level measurement has always been a challenge. The user has used copper strip level gauges and single flange differential pressure transmitters successively. The structure of the steel strip level gauge is complex, the installation cost is high, and there are many links that generate measurement errors. The actual measurement effect is not very good; The measurement method of a single flange level gauge is simple, but the maintenance amount is too large and the maintenance cost is high. The main problem is that the connection of the pressure pipe is prone to oil leakage, and maintenance personnel need to regularly inject oil. The operator needs to add engine oil to the water seal platform and the top of the bell jar, and the working conditions are both difficult and dangerous. Be very careful when injecting oil, and do not introduce air, which may cause bubbles to enter the pressure pipe, otherwise it may also cause measurement errors.

Lifting radar is a reliable means of measuring the level of gas tanks in a stable manner. The Dinghua G80 FM radar level gauge installed by the user has a beam angle of only 3 ', which can avoid interference such as baffle brackets, ensuring that the instrument can accurately measure when the gas holder is in position.

In terms of gas holder working conditions, the G80 frequency modulation radar level gauge has the advantages of simple installation, stable measurement, and easy maintenance, and is worth trying to retrofit for users with gas holders.