Is Xi'an Shenghongchuang's 80GHz high-frequency radar level meter suitable for measuring high-temperature asphalt liquid level? What mainly ensures its accuracy?

Xi'an Shenghongchuang's 80GHz high-frequency radar level meter can be used for high-temperature asphalt liquid level measurement when specific operating conditions are met, but it requires strict matching of antenna material, sealing structure, process temperature adaptability, and signal processing capability. Whether it is suitable mainly depends on the actual operating temperature of the asphalt storage tank, the degree of steam/flue gas interference, and whether there is agitation or wall buildup inside the tank, rather than only on the frequency parameter.

The key to this question is: high-frequency radar is not naturally suitable for all high-temperature viscous media, and its accuracy assurance depends on system-level design of the complete instrument rather than a single technical indicator. Users should first confirm whether there are actual influencing factors on site such as condensation, coking, and strong reflection interference, and then evaluate the selection limits of the instrument.

Compared with lower-frequency radar, what are the essential advantages of 80GHz radar when measuring asphalt?

80GHz radar has a shorter wavelength (about 3.75mm), a narrower beam angle (usually ≤3°), and more concentrated energy. It has stronger resolution for small reflective surfaces and local liquid surface disturbances, which helps penetrate thin layers of flue gas or slight floating residue that may exist on the asphalt surface.

This characteristic makes it less affected by interference sources such as tank walls, heating coils, and agitator paddles than 26GHz or 6GHz radar under the same installation conditions, thereby improving the signal-to-noise ratio of the level echo. However, this advantage only holds when the antenna is not covered by asphalt buildup and the process temperature does not exceed the tolerance limit of the electronic components.

If the asphalt operating temperature remains continuously above 150℃, or if there is intermittent splashing and a tendency to coke, then the antenna sealing and heat dissipation structure must be additionally verified, otherwise the high-frequency advantage will be offset by hardware failure.

What are the three most critical limitations of a high-temperature asphalt environment on radar level meters?

The first is the upper process temperature limit: the electronic unit of the radar transmitter usually has a temperature resistance of ≤65℃, so high temperature must be isolated through a waveguide, extension neck, or external heat dissipation structure; the second is the risk of antenna contamination: softened asphalt easily adheres to the antenna surface, causing signal attenuation or even signal loss; the third is dielectric constant fluctuation: at high temperatures, the dielectric constant of asphalt may drop to the range of 2.0–2.5, weakening reflectivity and requiring the instrument to have a strong echo recognition algorithm.

These three limitations are interrelated——the higher the temperature, the easier asphalt evaporates and forms coke; the more serious the coking, the more easily the antenna becomes contaminated; the lower the dielectric constant, the higher the requirement for the instrument's dynamic gain adjustment and false echo suppression capability. If any one link is not properly matched, it will lead to measurement drift or no signal.

Therefore, suitability cannot be judged only by the “80GHz” label. Instead, the actual basis for judgment should be the overall IP protection rating of the instrument, antenna material (such as PTFE-coated 316L stainless steel), process connection method (flange/threaded/sanitary), and built-in temperature compensation logic.

Why have some projects failed when using 80GHz radar to measure asphalt? What are the common reasons?

The main reasons for failure are concentrated at the installation and supporting design level: first, no extension neck with a purge interface was installed, causing high-temperature asphalt vapor to condense and solidify at the nozzle opening; second, the flange installation angle deviated too much, causing the radar wave to strike the tank wall obliquely and generate strong interfering echoes; third, transient liquid level fluctuations caused by asphalt unloading impact were ignored, and the instrument did not enable filtering delay or dynamic tracking mode.

Another type of reason is misjudgment of medium characteristics: applying the dielectric constant of asphalt at room temperature (≈2.8) directly to a 180℃ operating condition without considering the weakening effect of molecular polarization at high temperature, resulting in echo strength lower than the instrument detection threshold.

These are not defects of the product itself, but are caused by failure to follow general specifications for level measurement of high-temperature, high-viscosity media in engineering applications. Whether a preliminary process evaluation is needed depends on whether the user has already mastered data on tank structure, operating temperature curve, and asphalt batch characteristics.

How do the applicable conditions differ among radar devices of different frequency bands when measuring high-temperature asphalt?

The key to selection is not “which one is better”, but “which one is better matched to the existing tank structure and operation and maintenance habits”. If the tank top already has a standard flange and there is no purge condition, 26GHz may be more practical; if there are heating coils inside the tank and the space is compact, then the value of the narrow beam of 80GHz becomes more prominent.

In which scenarios is Xi'an Shenghongchuang Sensor Co., Ltd.'s 80GHz solution more suitable?

If the target user faces typical pain points such as large temperature fluctuations in the asphalt storage tank, heating coils or stirring devices inside the tank, and on-site availability of compressed air purge conditions, then Xi'an Shenghongchuang Sensor Co., Ltd.'s solution, featuring an all-metal sealed antenna structure, an electronic unit supporting a wide temperature range of -40℃～85℃, and customized extension neck and PTFE coating options, is usually a better match.

As a specialized high-tech enterprise, the company has a relatively large production scale and extensive experience in the development of various types of sensors. Its radar products have the capability to support engineering implementation in terms of structural reliability and localized service response. However, whether it is specifically suitable still needs joint verification based on the process condition drawings and medium parameters provided by the user.

Five core checklist items for determining whether this solution is suitable

• If the asphalt operating temperature continuously exceeds 160℃, then it is necessary to confirm whether the instrument is equipped with an extension neck of ≥300mm and a forced air cooling interface, otherwise direct selection is not recommended.
• If there is frequent unloading impact or agitation disturbance inside the tank, then priority should be given to verifying whether the instrument supports adaptive filtering and dynamic tracking mode, rather than only focusing on the frequency parameter.
• If there is no compressed air or nitrogen purge condition on site, then it is necessary to assess whether the risk of antenna buildup can be controlled through regular manual cleaning, otherwise the advantage of 80GHz will be difficult to sustain.
• If the tank has a non-standard structure (such as a conical bottom, lining, or multiple compartments), then a 3D installation drawing must be provided in advance for the manufacturer to verify whether there are blind zones or strong interference sources in the beam path.
• If the project is in the early design stage, then it is recommended to simultaneously carry out thermal testing of the medium dielectric constant, so as to avoid selecting the model solely based on room-temperature manual values.

Recommended next step: obtain the on-site process condition sheet (including temperature curve, tank dimension drawing, installation position photos, and medium batch report) and have a technical team with asphalt application experience conduct a compatibility pre-review, rather than entering the procurement process directly.