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Principle and Characteristics of ELL External Level Switch 1. Principle: Attenuation of ultrasonic waves as they propagate through the wall. https://bbs.hcbbs.com/forum.php?mod=image&aid=2131659&size=300x300&key=f30ce41805e46344&nocache=yes&type=fixnone Operation mode: Resonant type. Technical features: Variable-frequency ultrasound technology to eliminate interference and prevent false alarms. Schematic diagram of an external level switch: One monitoring point is monitored using two probes, one being a transmitting probe and the other a receiving probe ； The transmitting probe emits ultrasonic waves; due to the different transmission rates of these waves in liquids and gases, the receiving probe captures different amounts of residual energy depending on whether there is liquid at the point being monitored. The instrument then indicates whether liquid is present or not based on these differences in energy levels. 2. Technology 1) Variable-frequency and variable-amplitude ultrasound technology is a unique technology. Through the accumulation and analysis of application data from over ten thousand instruments, an advanced adaptive learning algorithm was developed; the effective signal recognition rate exceeds 98%, enabling the differentiation of attachments, rain, and spraying at the signal recognition level ； Interference signals can be effectively filtered out through dynamic adjustment of the sensor’s frequency and amplitude ； Excellent sensor manufacturing processes, high-performance materials, and strict installation procedures ensure the realization of this technology. 2) Micro-vibration analysis technology and its features represent a type of external signal processing technique that enables intelligent analysis of the signals received by the sensing probe. It allows for effective elimination of interference and accurate detection of signal changes, thereby enabling ELL external level switches to function reliably in various complex field conditions over the long term. https://bbs.hcbbs.com/forum.php?mod=image&aid=2131660&size=300x300&key=28ff8dfb17eb4a7e&nocache=yes&type=fixnone 3. Features: The ELL level switch is an isolated sensing device for detecting the liquid level from outside the container. Thanks to the use of proprietary technologies such as \"micro-vibration analysis technology\" – a technique for processing external sound wave signals – and \"frequency-variable ultrasonic technology\" – a technique for identifying and processing residual sound wave vibrations – the reliability and stability of the ELL external frequency-variable ultrasonic level switch are ensured. Advantages: 1. Online installation without stopping the operation; no need to open containers, use fire, or install flanges ； 2. Not affected by the viscosity of the liquid being tested, nor by the purity of the liquid ； 3. Unaffected by the density, pressure, temperature, etc. of the medium ； 4. Unaffected by the operating conditions inside the container being tested. 5. No mechanical moving parts, ensuring durability and no wear ； 6. Environmentally friendly, with no risk of leakage. Due to the above characteristics of the ELL level switch, it is suitable for: 1. Applications with stringent safety requirements and demanding installation conditions ； 2. Suitable for level monitoring of various liquid media, including challenging media such as asphalt and crude oil ； 3. The patented technologies of “micro-vibration analysis” and “variable-frequency ultrasonic technology” ensure the accuracy, reliability, and stability of the instrument.