The **PPD-C1H1N-R** is a specific part number primarily associated with **Photoelectric Sensors**, typically manufactured by companies like Takex (Takenaka) or similar industrial automation brands. It is designed for object detection in industrial environments. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical properties. | Feature | Specification | | :--- | :--- | | **Sensor Type** | Photoelectric Sensor (Convergent Reflective) | | **Detection Method** | Light emission and reception in a single housing | | **Sensing Distance** | Usually ranges from 5mm to 25mm (focused) | | **Output Type** | NPN Open Collector | | **Operation Mode** | Light-ON / Dark-ON (Selectable) | | **Supply Voltage** | 12V to 24V DC | | **Current Consumption** | ~20mA to 30mA | | **Response Time** | < 1ms | --- ## 2. Component Breakdown The internal electronics of the PPD-C1H1N-R consist of three main stages: ### A. Emitter Stage * **Infrared/Red LED:** The light source that pulses at a specific frequency to avoid interference from ambient light. * **Oscillator Circuit:** Controls the pulse frequency of the LED. ### B. Receiver Stage * **Photodiode/Phototransistor:** Captures the reflected light. * **Band-pass Filter:** Ensures the sensor only responds to the specific frequency emitted by the LED. * **Comparator:** Compares the received signal strength against a set threshold to determine if an object is present. ### C. Output Stage * **NPN Transistor:** Acts as a switch. When an object is detected, the transistor pulls the output signal to Ground (0V). * **Protection Circuitry:** Includes reverse polarity protection and surge suppression to prevent damage from electrical spikes. --- ## 3. Wiring Configuration The device typically uses a standard 3-wire or 4-wire color-coding scheme: ```markdown 1. Brown -> Positive Supply (+V) 2. Blue -> Negative Supply (0V/GND) 3. Black -> Control Output (NPN) 4. White -> Mode Selection (Light-ON/Dark-ON) ``` --- ## 4. Key Applications * **Wafer Detection:** Common in semiconductor manufacturing due to the convergent beam. * **PCB Sensing:** Detecting the presence of circuit boards on a conveyor. * **Small Object Counting:** Because the beam is focused (convergent), it can ignore backgrounds and focus only on a specific point.