JL series ultrasonic electronic switch and its application

The **JL Series Ultrasonic Electronic Switch** is a high-performance device designed for automatic control applications, particularly in water-saving systems and industrial automation. It consists of several key components: a pulse generator, a cyclic distributor, an ultrasonic transmitter, an ultrasonic receiver, a frequency-selective amplifier, a detection circuit, and a switching controller. By utilizing the principle of ultrasonic directional emission and delayed reception, it can detect the presence of people or objects within a designated area and trigger automatic on/off functions through a corresponding control circuit and switching element. This system allows for flexible multi-channel and multi-function control, making it highly adaptable to various environments. ### Working Principle As illustrated in the schematic block diagram below, the JL series ultrasonic switch operates by first generating a pulse signal from the pulse generator, which activates the cyclic distributor. The distributor sends signals to the ultrasonic transmitter, which emits a series of ultrasonic waves during the time interval from t0 to t1 toward the detection area. At the same time, the cyclic distributor also controls the gate of the detection amplification circuit, enabling it to receive reflected signals during the time window from t2 to t3. These signals are then processed by the frequency-selective amplifier, followed by detection, amplification, and comparison. Finally, the driving circuit controls switching components such as solenoid valves, relays, or thyristors to perform the desired switching function. ![Schematic block diagram of automatic electronic water saving device](http://i.bosscdn.com/blog/20/17/11/7162531459549.jpg) ### Application Examples 1. **Automatic Shower Water-Saving Device (JL-IL)** Traditional infrared-based automatic showers often fail due to interference from water vapor in bathrooms. The JL series ultrasonic switch overcomes this issue by using ultrasonic waves that can penetrate water mist, enabling non-contact, reliable control of the water flow. This device turns off automatically when the user leaves the shower area, offering a water-saving efficiency of over 30%. It’s the first of its kind in China and has significantly improved the performance of automatic shower systems. 2. **Automatic Hand-Washing Machine (JL-1X)** Many infrared-based hand-washing machines have limited detection ranges, usually around 10 cm, which can lead to poor performance. In contrast, the JL series allows for adjustable detection distances between 10 cm and 30 cm, making it easier to implement efficient and hygienic automatic hand-washing solutions. This product helps reduce cross-infection and is ideal for public restrooms. 3. **Automatic Urinal Flushers (JL-IG, JL-IT, JL-1D)** These devices use ultrasonic technology to automatically flush urinals based on user presence. The detection range can be set between 0.2 m and 3 m, and the trailing-edge trigger circuit ensures that the flush lasts for 5–10 seconds after the user leaves. Compared to traditional infrared models, these systems offer better installation flexibility, longer detection range, and more than 50% water savings. ### Conclusion The JL series ultrasonic electronic switches are widely used in hotels, restaurants, hospitals, residential buildings, and industrial facilities. Their reliability, adaptability, and energy-saving performance make them a leading choice in the field of automatic control and water conservation. Whether for showers, hand-washing stations, or urinals, these devices provide a smart, efficient, and hygienic solution for modern infrastructure.

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