The working principle of guided wave radar level gauge is based on the time-domain reflection principle (TDR). It relies on radar waves to propagate along steel cables or probes at the speed of light, and when the radar waves encounter the surface of the measured medium, they will reflect back to form echoes. By accurately calculating the propagation time of radar waves, the height of the liquid level can be determined. However, in high-temperature steam environments, the interference of steam can cause attenuation of radar wave energy and also lead to multipath propagation problems, which can have adverse effects on the accuracy of measurements.
To solve this problem, steam compensation technology emerged. One effective method is to use guided wave radar level gauges. This type of liquid level gauge utilizes the characteristics of microwave propagation along the waveguide body by installing a waveguide rod or waveguide rope inside the container for measurement, which can significantly reduce the interference of steam on the measurement and improve the accuracy of the measurement. In addition, selecting materials that are resistant to high temperatures and corrosion to make the probe and seal of the radar level gauge, as well as optimizing the installation plan to avoid direct exposure of the radar level gauge to high temperature areas, are also effective ways to reduce the impact of steam and ensure measurement accuracy.