The difference and scope of application of pulsed radar level gauge and guided wave radar level gauge

What is the difference between a pulsed radar level gauge and a guided wave radar level gauge? The non-contact radar level meter is an instrument suitable for accurate measurement when the material cannot be contacted. There is also a radar level meter that can directly contact the measured material through a waveguide or a probe. The two types are what we usually call pulsed radar level gauges and guided wave radar level gauges. What are the characteristics of these two types of radar level gauges and their application scope, please see the following 1. From the perspective of structure , The fundamental difference between the pulse radar level meter and the guided wave radar level meter is that one is non-contact and contact type. The type is selected according to the industrial and mining environment. The pulse transmits and receives microwaves through the beam angle of the horn mouth. Guided waves travel around and receive signals through rods or cables. The pulse radar level meter uses high-frequency or low-frequency wave pulses to transmit and receive through the antenna system. The radar wave runs at the speed of light, and the running time can be converted into a level signal through electronic components. The main difference is the principle and structure. The guided wave radar level gauge is a measuring instrument based on the principle of time travel. The radar wave runs at the speed of light, and the running time can be converted into a level signal through electronic components. 2. Determine the type of selection according to the site conditions: what kind of material solids and powders are measured on site Usually, a pulsed radar level meter is used (such as coal mine, slag, etc., and a guided wave radar level meter is considered for the case of large dust. 3. It can be considered according to the dielectric constant of the measured medium: the liquid is usually selected by a guided wave radar level gauge, and usually the dielectric constant is greater than 0.7 can be measured normally. The choice of the flange of the guided wave radar level gauge is usually based on the customer's site Depending on the size of the opening, the guided wave radar can be divided into rod type and cable type. Usually, a cable radar level gauge is used, which is more convenient to transport. However, for those with corrosion resistance requirements, a rod type radar level gauge is used. Pulse radar level gauge can also be considered for liquids that are not very strong. 4. Temperature is also a factor that needs to be paid attention to when selecting models. It can be determined whether a heat sink needs to be added according to the temperature provided on site. The temperature is -30℃- If the temperature is between 130℃ and 250℃, I choose the radar level meter with heat sink. In view of the current production technology and technology, the instrument cannot be used for measuring the ambient temperature at 250℃. To achieve a stable working state, basically do not give up the measurement of ambient temperature greater than 250 ° C. 5. According to the pressure parameters provided on site, select the thickness of the flange and related information. For normal pressure, do not consider it. 6. According to Whether explosion-proof is required for the site environment and customer requirements, usually chemical liquids, coal mines, etc. need explosion-proof. 7. If a pulsed radar level meter is used, since the radar emission is directly carried out through the horn, it is the antenna of the pulsed radar wave, so we choose the type. When the installation and production process allow, try to choose a product with a larger size, which can better ensure the stability of the on-site measurement. 8. According to the on-site measurement range, the pulse-type radar level meter is divided into: There are two types of low frequency pulse radar level gauge and high frequency pulse radar level gauge. The limit height that can be measured by low frequency pulse radar level gauge is 35 meters, while the limit height that can be measured by high frequency pulse radar level gauge is 70 meters. The wave radar level gauge is also divided into two types, one is the rod type radar level gauge and the other is the cable type radar level gauge. The limit range of the rod type radar level gauge is 6 meters, while the cable type radar level gauge The limit range of the level meter is 30 meters. Taking these decisive parameters into account, the most suitable level (liquid level) meter can be selected.
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