The working principle of a guided wave radar level transmitter is to emit a high-frequency pulse signal, which propagates along the waveguide to the surface of the measured medium. When the signal encounters the medium interface, it is reflected. By measuring the time difference between the emitted and reflected signals, the liquid level height can be calculated. This device is suitable for measuring liquids, solid particles, and viscous media, and is unaffected by factors such as temperature, pressure, and steam.