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An external level switch is a contactless level switch that utilizes \"frequency-modulated ultrasonic technology,\" and it is widely used for detecting the level of various liquids. Its main feature is that the measuring probe is installed on the outer wall of the container, making it a completely contactless level measurement instrument that operates by measuring from outside the tank. The external level switch’s sensing probe emits ultrasonic waves and detects the reflected signals from the container wall; when the liquid covers the probe, the amplitude of these reflected signals decreases. Upon detecting this change, the instrument generates a switch signal. “\"Variable-frequency ultrasound technology\" is a cutting-edge ultrasound signal variation detection technology invented by Dinghua Company. The main problem with traditional ultrasonic level switches is that the ultrasonic signal is affected by deposits on the tank walls, and it experiences drift over time and with changes in temperature, which alters the amplitude of the residual vibration signal and thus leads to false alarms. By utilizing its patented adaptive frequency and amplitude adjustment ultrasonic technology, Dinghua can effectively eliminate interference and drift, accurately detect signal changes, enabling it to function in various complex field conditions with long-term stability and reliability. The external level switch benefits from Dinghua Company’s \"micro-vibration analysis\" technology for processing external sonar signals, along with advanced manufacturing processes, which ensure the reliability and durability of the ELL-SA external frequency-variable ultrasonic level switch.