The **UDS-151-R** is a high-performance **Ultrasonic Double-Sheet Detector**. It is primarily used in industrial automation to prevent the feeding of two or more sheets of material (paper, metal foils, or plastic) into a machine, which could cause damage or production errors. Below is an explanation of its core electronic components and technical specifications. --- ### 1. System Components The UDS-151-R operates as a system consisting of three main electronic parts: | Component | Function | | :--- | :--- | | **Control Unit (UDS-151-R)** | The "brain" of the system. It processes signals, handles logic, and provides outputs. | | **Ultrasonic Transmitter** | Emits high-frequency sound waves (usually around 400 kHz). | | **Ultrasonic Receiver** | Captures the sound waves that pass through the material. | --- ### 2. Core Electronic Principles The device operates on the **Ultrasonic Attenuation** principle: 1. **Pulse Emission:** The transmitter sends an ultrasonic pulse through the material. 2. **Signal Analysis:** When the sound hits the material, a portion is reflected, and a portion passes through. 3. **Double Sheet Detection:** If two sheets are present, a tiny air gap exists between them. This air gap causes a massive drop in the ultrasonic signal strength compared to a single sheet. 4. **Logic Output:** The internal microprocessor compares the received amplitude against a programmed threshold and triggers the output relay or transistor. --- ### 3. Technical Specifications The electronics are designed for high-speed industrial environments: | Feature | Specification | | :--- | :--- | | **Operating Voltage** | 18 - 30 V DC | | **Current Consumption** | Approx. 50 mA | | **Output Type** | PNP or NPN (Switches upon detecting double sheets) | | **Response Time** | < 500 µs (Microseconds) | | **Frequency** | ~400 kHz | | **Indicator LEDs** | Green (Single sheet), Red (Double sheet), Yellow (No sheet) | --- ### 4. Interface and Connectivity The UDS-151-R typically features the following electronic interfaces: * **M12 Connectors:** Standardized industrial circular connectors for the sensors and power supply. * **Teach-In Input:** An electronic line that allows the user to "calibrate" the sensor to a specific material thickness by applying a high/low signal. * **Status Outputs:** Separate outputs for "Double Sheet" and "Missing Sheet" detection. ---