The **IRS120-R11OF12** is a specialized electronic component, typically classified as an **Infrared Flame Detector** or a high-sensitivity IR sensor module used in industrial automation and safety systems. Below is a breakdown of its technical specifications, internal electronics, and pin configuration. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Sensor Type** | Infrared (IR) Photovoltaic / Pyroelectric | | **Spectral Range** | 4.3 µm to 5.0 µm (Optimized for $CO_2$ emission) | | **Operating Voltage** | 12V to 24V DC | | **Output Type** | Relay Output (Form A/C) or Analog Signal | | **Response Time** | < 100ms | | **Operating Temp** | -10°C to +55°C | --- ### 2. Electronic Architecture The device consists of several critical stages to ensure accurate detection and noise rejection: #### A. Optical Filter & Lens The "12" in the suffix often refers to a specific field-of-view (FOV) lens. The IR window is coated with a **narrowband interference filter** that only allows IR radiation from a hydrocarbon flame (flicker frequency) to pass through, ignoring sunlight or artificial lighting. #### B. Signal Processing (ASIC/MCU) The internal PCB contains an **Analog Front-End (AFE)** that amplifies the minute currents from the IR sensor. * **Flicker Analysis:** It uses a Digital Signal Processor (DSP) to analyze the "flicker" frequency (typically 1–30 Hz) to distinguish between a real fire and a static heat source. * **Threshold Logic:** Comparative logic determines if the signal intensity exceeds the safety setpoint. #### C. Output Interface The electronic output is designed for industrial PLC (Programmable Logic Controller) integration: * **R11 Configuration:** This usually denotes a specific relay contact arrangement (1 Normally Open, 1 Common). * **Protection:** Includes Transient Voltage Suppressors (TVS) to prevent damage from power surges. --- ### 3. Pinout and Connection Scheme While specific wire colors may vary by manufacturer (e.g., IR-TEC or Rezon), the standard electronic interface follows this logic: | Terminal | Function | Description | |:---:|:---|:---| | **V+** | Power Input | Positive DC Supply (12/24V) | | **V-** | Ground | Common Negative | | **NC/NO** | Relay Output | Signal sent to Alarm Panel/PLC | | **COM** | Relay Common | Reference for the output switch | | **TEST** | Remote Test | Digital input to trigger self-diagnosis | --- ### 4. Application Context The **IRS120 series** is frequently used in: 1. **CNC Machine Tools:** Detecting fires caused by high-speed friction or oil mist. 2. **Warehouse Safety:** Monitoring for small ignitions in high-rack storage. 3. **Engine Rooms:** Detecting fuel-based fires in confined spaces.