HOTLINE 0086-29-88606479
  Tel: 86-29-88606479   E-mail:


About us

How to prevent corrosion, shock and dust of radar level gauge

DATE: 2020-08-11

The radar level gauge is an indispensable monitoring equipment. On the one hand, the level gauge can maintain the smooth operation of the chemical production line, and on the other hand, it can also play a role in protecting life and property. For on-site instruments, long-term exposure to the sun and rain, the instrument is prone to failure, then we need to do a good job in the anti-corrosion, anti-vibration and dust-proof work of the instrument, strengthening the management and maintenance of the instrument can not only improve the instrument The accuracy of the instrument can also extend the service life of the instrument. Let’s follow Xiao Rui to understand how the field instrument is anticorrosive, shockproof and dustproof!

How to prevent corrosion, shock and dust of radar level gauge


Anti-corrosion maintenance of field instruments


1. Choose materials reasonably


Targeted selection of corrosion-resistant metal or non-metallic materials to manufacture instrument parts is the fundamental method of industrial instrument corrosion prevention. For example, instrument parts made of titanium and tantalum metal have strong corrosion resistance to chlorine chemical media; instrument parts and gaskets made of polytetrafluoroethylene materials are also widely used in various corrosive media environments.


2. Add a protective layer


Making a protective layer on instrument parts or components is a very common anti-corrosion method in the industry. According to the different materials and forming principles of the protective layer, it can be divided into the following three types:


Metal protective layer. Including spraying, electroplating, hot dipping, carburizing, etc.


Non-metal protective layer. Such as paint, acid-resistant cement, rubber, plastic, enamel, etc.;


Non-metal protective film, chemical treatment is performed on the metal surface to generate protective films such as oxide film and phosphate film;


3. Use spacer


This is an effective method to prevent the corrosive medium from directly contacting the instrument. When it is impossible to choose a suitable corrosion-resistant instrument, the isolation liquid can be used to achieve the purpose of isolation. Isolation fluid is often used for pressure, flow, and liquid level measurement of corrosive media. The isolation fluid must neither dissolve the measured medium and exert a chemical effect, nor be corrosive to the measuring parts of the instrument. The density of the isolation fluid should be different with respect to the density of the measured medium and the working medium of the instrument, and its density and viscosity should not change significantly when the ambient temperature changes; it should also have good fluidity. In unexpected circumstances, when the isolation fluid is mixed into the measuring pipeline, it should not affect the use of the measured medium. For example, glycerin aqueous solution is suitable for oil, water gas, semi-water gas, C1, C2 and other hydrocarbons; ethanol is suitable for propane, butane and other media; methyl silicone oil is suitable for various gases and liquids other than moisture chlorine gas.


4. Diaphragm isolation


A corrosion-resistant diaphragm is used to isolate the isolation fluid or filling fluid from the measured medium to achieve the purpose of anti-corrosion. It is suitable for strong corrosive media, and it is difficult to use pipe isolation or container isolation. It is usually suitable for pressure measurement, and is not suitable for differential pressure measurement. The isolation diaphragm should have elasticity and impermeability, such as the commonly used diaphragm pressure gauge, single flange anticorrosive pressure transmitter, etc.


5. Blow method


This is to use blown air (or inert gas such as nitrogen) to isolate the corrosive effect of the measured medium on the measuring parts of the instrument. The air blowing method is usually used in normal pressure or low pressure liquid level measurement systems, and the blowing gas should not interact with the corrosive measured medium. According to the principle of constant pressure in the air blowing method, the liquid blowing (clean liquid such as water) method is also applied in the flow and liquid level measurement system. For example, steam condensate is blown to isolate the corrosion of the measuring parts of the instrument and eliminate the blockage of the pressure guiding tube.


Dust-proof maintenance of field instruments


The dustproof method for the outside of the instrument is to cover the instrument with a protective cover or put it in a sealed box.


For the protection of dust, impurities and particles in the measured medium, in addition to measures such as dust reduction to prevent clogging, methods such as thickening the intake tube, adding dust collectors, installing air blowing devices, and installing protective screens are usually adopted. .


The coarse intake pipe is often used in combination with a dust collector and a purging device. When an orifice plate without annulus is used to measure flow, a 1.5~2m thick intake tube can be used directly at the pressure tap, and a plug can be installed to clean the hole or as a vent during maintenance. During liquid level measurement, in order to prevent crystallization in the negative pressure tube, the method of blowing steam condensate can be used for the negative pressure tube. For gas measurement with water content, a water separator can be used, which is common in pressure and flow measurement.


Share to
  • Number of clicks: 266
    2021 - 03 - 02
    Radar level instruments measure the distance from the transmitter/sensor (located at some high point)to the surface of a process material located further below in much the same way as ultrasonic level sensor, by measuring the time-of -flight of a traveling wave and then determine the level of the process material. They are regarded as continuous level measurement devices because they continue to measure level even as the level of the liquid in the vessel changes.The fundamental difference between a radar level instrument and an ultrasonic level instruments is the type of wave used. Radar level instruments use radio waves instead of sound waves used in ultrasonic instruments. Radio waves are electromagnetic in nature (comprised of alternating electric and magnetic fields), with very high fr...
  • Number of clicks: 2
    2021 - 02 - 25
    The working principle and five precautions for using the radar level sensorThe radar level sensor 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 conducts them along the cable and rod probes. When the pulses meet the surface of the material, they are reflected back by the receiver in the meter, and the distance signal is converted into a level signal, Transmit-reflect-receive is the basic working principle of radar level sensor.The antenna of the radar sensor emits electromagnetic wave signals in the form of beams. The emitted waves are reflected on the surface of the material to be measured, and the ...
  • Number of clicks: 212
    2021 - 02 - 23
    Our DCRD1000C series guided wave radar level gauge has been successfully applied to the measurement of liquid level in a horizontal tank of a biotechnology company. Since the product is installed and used, it has monitored the liquid/corrosive liquid level changes in real time, and the signal stability measurement effect is good.If there is similar enquiry, please feel free to contact us!!!
  • Number of clicks: 101
    2021 - 02 - 19
    Factory of Radar level transmitter have resumed production  With the time going by, the Chinese New Year Holiday is over and our factory has resumed production now. The continuous level measuring products include 26GHz high frequency radar level transmitter, guided wave radar level transmitter, 80Ghz FMCW Radar  level transmitter, 120Ghz FMCW Radar level transmitter and Electromagnetic flow meter. These products are widely used in electricity, water, food & beverage, petroleum, petrochemical, coal, chemical, metallurgy industries. Measurable products: petroleum, petroleum products, heavy oil, asphalt, gasoline and other light-colored petroleum products, acid, food, beer, alcohol, milk, liquefied gas, sewage, solution, phenol, ore, cement, seeds, coal ...
  • Number of clicks: 361
    2021 - 02 - 02
    The radar level transmitter should be installed to avoid contact between the sensor and the tank wall and should be kept at a certain distance from the tank wall. Because the radar level transmitter is measured by transmitting high-frequency microwave pulses along the detection component, the dielectric constant changes when these pulse waves encounter the measured medium, causing the emission. Therefore, if the installed radar level transmitter is too close to the tank wall, the dielectric constant of the tank wall may be obtained, which directly leads to the in accuracy of the measured parameters.Correct installation method of radar level transmitter:1. Installed one fourth or sixth of diameter.Note:the minimum distance from the tank wall shall be one tenth ...
Tel:86-29 88606479
Fax: 86-29 88385903
B203, Gazelle Valley, No.69 Jinye Rd, Hi-tech zone, Xi'an, Shaanxi Province, P.R.China. 710077
Copyright ©2018 - 2019 Dechuang Electrical Technology Co., Ltd SITEMAP
Rhino Cloud Provides Enterprise Cloud Services