Because in the industrial production often met some materials need to measure cannot direct contact, but must have a accurate height or level of requirements, in this case, the general instrument is helpless, non-contact radar level meter is a kind of special suits in this kind of situation accurately measuring instrument, there is also a wave guide line or wave guide rod direct contact with the test material to measure radar level meter, said above is what we usually call the two types of pulse radar level meter and guided wave radar level meter, for both types of radar level gauge
how what are the characteristics and application scope, in this article the following points, you can have a more detailed understanding.
* first, from the structure, type pulse radar level meter and guided wave radar level meter is the fundamental difference between a contact and contact, according to the industrial and mining environment selection, pulse through the cone beam Angle to the transmission and reception of the microwave.
Guided wave through the rod or cable and reception everywhere.
Pulse radar level meter by using high frequency or low frequency pulse transmitting and receiving antenna system, radar wave run at the speed of light, running time can be transformed into material level signal by electronic parts.
Mainly principle and structure is different, the guided wave radar level meter is the measuring instrument based on the principle of time travel, radar wave run at the speed of light, running time can be transformed into material level signal by electronic parts.
Second is selected according to the situation on site and determine the type: field measured what material of solid and powder usually choose type pulse radar level meter (
Such as coal, slag, etc. , for larger dust into cases with guided wave radar level meter.
The third can be according to the dielectric constant of measured medium into consideration: liquid usually choose guided wave radar level meter, usually dielectric constant is greater than zero.
7 can be normal measurement.
The choice of the guided wave radar level meter flange is usually open hole size to order according to the customer site, with normal DN100 flange.
Guided wave radar can be divided into bar type and cable again, usually choose cable radar level meter, the transportation more convenient.
There is a requirement for corrosion resistance but for choose lever radar level meter, liquid for corrosion resistance is not strong also can consider to use type pulse radar level meter.
Temperature is also our particular attention in selection of factor, can according to the scene to provide to determine whether to need to add the temperature of heat sink, temperature in -
Choose normal between 130 ℃ and greater than 130 ℃
250 ℃ I choose add heat sink of radar level gauge, given the current production technology and process, for the environment temperature is 250 degrees are not able to make the instrument to achieve stable work state, so basically for measuring temperature greater than 250 ℃ don't give it up.
According to the scene to provide pressure parameters, to choose the thickness of the flange and the related information.
For atmospheric pressure is not considered.
Whether you need according to the site environment and customer requirements explosion-proof, chemical liquid, usually need explosion-proof coal mine and so on.
If the chosen type pulse radar level gauge, as a result of radar transmitter is directly through the horn, is pulse radar antenna, so our selection in the installation and production process, to the extent permitted to select the product that you choose size bigger, it can better ensure the stability of field measurement.
Based on field measurement range to decide, it is worth noting that the pulse radar thing location score is: low frequency pulse radar level meter and the high frequency pulse radar level meter two kinds.
Low frequency pulse radar level meter can measure the limit is 35 meters high, and high frequency pulse radar level meter can measure the limits of the height of 70 meters.
Guided wave radar level meter is also divided into two kinds, one kind is another for bar type radar level meter cable type radar level meter.
Bar type limit range of radar level gauge is 6 meters, and the limit of the cable type radar level meter range of 30 meters.
The crucial parameters are taken into account, can choose to apply liquid level meter
In this paper by embellish instrument technology co. , LTD. Arrange release.
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