The **SES-2A2-R/E2** is a specific model within the series of photoelectric sensors, typically associated with industrial automation brands like **Azbil (formerly Yamatake)** or similar manufacturers specializing in high-precision sensing. Below is a breakdown of its electronic components, specifications, and functional characteristics. --- ### 1. Technical Specifications The "SES" series generally refers to **subminiature photoelectric sensors** designed for space-constrained environments. | Feature | Specification Details | | :--- | :--- | | **Detection Method** | Thru-beam (Emitter and Receiver set) | | **Sensing Distance** | Typically 150mm to 300mm (model dependent) | | **Input Voltage** | 12 to 24V DC | | **Output Type** | NPN or PNP Open Collector (R/E usually denotes Receiver/Emitter) | | **Response Time** | Max 1ms to 2ms | | **Light Source** | Infrared LED (approx. 940nm) | | **Current Consumption** | 10mA - 20mA | --- ### 2. Electronic Component Breakdown The device consists of two main units: the **Emitter (E)** and the **Receiver (R)**. #### A. The Emitter (E2 Unit) * **Infrared LED:** The core light source. It pulses at a high frequency to distinguish its signal from ambient light. * **Oscillator Circuit:** Controls the pulse frequency of the LED. * **Current Limiting Resistors:** Protects the LED from over-current when connected to the 24V supply. #### B. The Receiver (R Unit) * **Phototransistor/Photodiode:** Captures the infrared light sent by the emitter. * **Preamplifier:** Small internal IC that boosts the weak signal from the photodiode. * **Comparator/Logic Circuit:** Determines if the light beam is "Broken" or "Unbroken" based on a preset threshold. * **Output Transistor:** An **NPN or PNP open collector** transistor that acts as a solid-state switch to signal a PLC or Controller. --- ### 3. Wiring and Pinout Standard electronic wiring for these sensors usually follows the industrial color code: | Color | Function | Description | | :--- | :--- | :--- | | **Brown** | VCC (+) | Positive power supply (12-24V DC) | | **Blue** | GND (-) | Negative power supply (0V) | | **Black** | Output | Signal wire (connects to load or PLC input) | --- ### 4. Key Applications Because of its subminiature size and the electronic precision of the R/E2 series, it is used for: 1. **Wafer Detection:** In semiconductor manufacturing. 2. **Small Part Counting:** Detecting pins or small electronic components on a conveyor. 3. **End-of-Travel Sensing:** Used in small robotic arms or actuators where space is minimal. ---