The **FUD-B4W-R/Q** is a specialized electronic component, typically categorized as a **Flame Sensor (UV Sensor)** or a specific industrial photo-detection module often used in safety systems or combustion monitoring. Below is a detailed breakdown of its electronic characteristics and technical specifications. --- ## 1. Core Technical Specifications The device is designed to detect ultraviolet (UV) radiation emitted by flames while ignoring visible light and infrared heat. | Feature | Specification (Typical) | | :--- | :--- | | **Detection Principle** | UV Photo-electric effect | | **Spectral Sensitivity** | 185 nm to 260 nm (UV-C range) | | **Operating Voltage** | 24V DC / 100-220V AC (Model dependent) | | **Output Type** | Relay Contact or Transistor Switch | | **Response Time** | < 0.1s - 1.0s | | **Housing Material** | Heat-resistant polymer or Aluminum alloy | --- ## 2. Key Electronic Components The internal circuitry consists of several critical stages to ensure reliable flame detection: ### A. The UV Sensor Tube This is the heart of the unit. It is a gas-filled tube that becomes conductive when exposed to UV photons. * **Narrow Bandwidth:** It is engineered to respond only to the 185–260nm range, which prevents "false trips" from sunlight or artificial room lighting. ### B. Signal Conditioning Circuit Because the raw signal from a UV tube is often weak or noisy, the internal PCB includes: * **Amplifier:** Boosts the micro-current generated by the UV tube. * **Comparator/Logic Gate:** Sets a threshold. The output only triggers if the UV intensity stays above a specific level for a set duration. ### C. Output Interface The **"R"** in the part number often denotes a **Relay** output. * **Dry Contacts:** Provides a physical switch (Common, Normally Open, Normally Closed) to interface with PLCs or Emergency Stop circuits. * **Isolation:** The electronic sensing side is usually galvanically isolated from the high-power switching side. --- ## 3. Wiring and Pinout (General Layout) While you should always consult the specific datasheet for your serial number, the standard 4-wire (B4W) configuration usually follows this logic: 1. **V+ (Power):** Positive supply voltage. 2. **V- (Ground):** Common/Return. 3. **Relay COM:** The common terminal for the output switch. 4. **Relay NO/NC:** The switched output that signals "Flame Detected." --- ## 4. Application Environments The FUD-B4W-R/Q is frequently found in: * **Industrial Boilers:** Monitoring the pilot light and main burner. * **Gas Turbines:** Rapid fire detection in high-value machinery. * **Fume Incinerators:** Ensuring the burner is active to prevent toxic gas release.