HOTLINE 0086-29-88606479
  Tel: 86-29-88606479   E-mail: sales@dechuang-auto.com

NEWS

About us

Radar level meter lightning protection

DATE: 2020-09-29
BROWSE TIMES: 182
Measures against lightning strikes for radar level gauges


With the need for the development of industrial automation, the instrumentation industry has developed rapidly. However, most of these intelligent instruments, which use a large number of micro-electric devices, have low insulation strength and primary problems with surge resistance. Therefore, the lightning protection of smart instruments and meters is very important, especially during the thunderstorm season to avoid huge losses.


Guided wave radar level gauge instrument lightning protection, we must start unilaterally, including internal system lightning protection and internal system lightning protection, generally mainly by participating in lightning protection devices. Specifically, the following methods can be used to develop lightning protection.

1. Lightning protection starts with grounding systems. The casing of the radar level gauge is very similar to the control cabinet, monopoly, power cabinet, etc. The casings are all adjacent to each other with flat steel. The instrument task power supply, such as the 24V negative terminal, is connected to the instrument signal ground, and the input and output signal ground of the totalizer to form an equipotential. Intrinsically safe grounds, safety barriers, barriers, safety devices and other grounding should also consider whether the instrument signal reference point can be equipotential when it is adjacent.

2. The lightning protection of the power supply of smart instruments and meters cannot be ignored. Install anti-surge systems for smart instruments and meters to ensure that the instrument does not exceed the withstand voltage limit. The surge injection device is required to send the overload current into the earth when a thunderstorm is induced by a thunder surge.

3. To equip smart instruments with trust number channel surge generators, not only to ensure that the dynamic transmission is accurate, stubborn, and agile, but also to discharge the piezoelectric surge to the ground during thunderstorms to ensure the safety of signal transmission.

4. Regularly develop, search and repair the power supply system grounding, bus bars, grounding bodies, surge devices, power lightning protection grids of smart instruments and meters, and change them in time.

Precautions for selection

The correct selection of the radar level gauge can ensure the better use of the radar level gauge. What kind of radar level gauge should be selected according to the physical and chemical properties of the fluid medium to be measured? Make the diameter, flow range, lining material, electrode material and output current of the radar level gauge suitable for the test The nature of the fluid and the requirements for flow measurement.

1. Precise function inspection

Accuracy grade and function Choose the instrument accuracy grade according to the measurement requirements and use occasions, so as to be economical and cost-effective. For example, for trade settlement, product handover and energy metering, you should choose a higher accuracy level, such as 1.0, 0.5, or higher; for process control, choose different accuracy levels according to the control requirements; some only It is to check the process flow and do not need to do precise control and measurement. You can choose a lower accuracy level, such as 1.5, 2.5, or even 4.0. At this time, you can choose a cheap plug-in radar level meter.

2. Measurable medium

When measuring medium flow rate, instrument range and caliber, when measuring general medium, the full-scale flow rate of the radar level gauge can be selected within the range of 0.5-12m/s to measure the medium flow rate, and the range is relatively wide. The instrument specification (caliber) selected is not necessarily the same as the process pipeline. It should be determined whether the measurement flow range is within the flow rate range, that is, when the flow rate of the pipeline is too low to meet the requirements of the flow meter or when the measurement accuracy cannot be guaranteed at this flow rate, It is necessary to reduce the diameter of the meter to increase the flow velocity in the pipe and obtain satisfactory measurement results.


Share to
RELATED NEWS / News More
  • 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 ...
Email:sales@dechuang-auto.com
Adress:
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
犀牛云提供云计算服务