The **FUD-GG-R/Q** series refers to a specific line of **Flame Detectors** (often UV/IR or Multi-spectrum) commonly used in industrial fire protection systems. These devices are designed to detect electromagnetic radiation emitted by fires while ignoring false alarm sources. Below is an explanation of the core electronic components and their functions within this series. --- ### 1. Core Electronic Components | Component | Description | Function | | :--- | :--- | :--- | | **UV Sensor** | Ultraviolet photo-tube (typically 185–260 nm). | Detects the high-energy photons emitted by a flame's initial ignition. | | **IR Sensor(s)** | Infrared pyroelectric sensors (typically 4.3 µm - 4.5 µm). | Detects the characteristic heat signature and "flicker" of CO2 emissions. | | **Microprocessor (MCU)** | Integrated high-speed digital controller. | Processes signals from sensors using logic algorithms to distinguish fire from sunlight or welding. | | **A/D Converter** | Analog-to-Digital Converter. | Converts the raw voltage from sensors into digital data for the MCU. | | **Relay Modules** | Dry-contact physical switches. | Provides "Alarm" and "Fault" outputs to the main Fire Alarm Control Panel (FACP). | --- ### 2. Circuitry and Interface Features #### A. Power Supply & Signal Output The device typically operates on **24V DC** and provides several communication interfaces: * **4-20mA Analog Output:** Used to transmit the current state or "health" of the detector to a PLC or DCS. * **RS-485 (Modbus):** Allows for digital networking, remote diagnostics, and event logging. * **Status LEDs:** Usually consists of a Green LED (Normal), Red LED (Alarm), and Yellow LED (Fault). #### B. The "GG" (Dual) Logic The "GG" designation often indicates a **Dual-Sensor** architecture. Electronically, the device uses "AND" logic: 1. The UV sensor detects the spark. 2. The IR sensor confirms the modulation (flicker) and heat signature. 3. **Result:** The alarm only triggers if both sensors validate the signal, significantly reducing false alarms from lightning or X-rays. --- ### 3. Technical Specifications Table | Specification | Typical Value | | :--- | :--- | | **Operating Voltage** | 18V to 32V DC | | **Power Consumption** | Standby: < 2W / Alarm: < 4W | | **Spectral Range** | UV: 185-260nm / IR: 4.35µm | | **Response Time** | < 5 to 10 seconds (standard) | | **Ingress Protection** | IP66 / IP67 (Electronic housing protection) | --- ### 4. Electronic Protection Features * **Optical Integrity (BIT):** The electronics include an "Automatic Built-In Test" that periodically fires an internal light source to check if the lens is dirty or the sensors are failing. * **Surge Protection:** Internal TVS (Transient Voltage Suppressor) diodes protect the sensitive MCU from voltage spikes caused by industrial machinery. * **Isolation:** Opto-isolators are often used between the sensing circuit and the output relays to prevent ground loops.