The **SVF-CD-R** usually refers to a specific series of **Compact Flame Detectors** (often manufactured by companies like Azbil or Yamatake). These devices are critical electronic components in industrial combustion systems, used to detect the presence or absence of a flame. --- ### Core Electronic Components The SVF-CD-R is an integrated optoelectronic device. Below are the primary internal parts and their functions: | Component | Function | | :--- | :--- | | **Phototube (Sensor)** | The "eye" of the device. It reacts to specific wavelengths of Ultraviolet (UV) radiation emitted by a flame. | | **Amplifier Circuit** | Converts the micro-level current generated by the phototube into a usable electrical signal. | | **Shutter Mechanism** | A mechanical/electronic "flicker" that periodically blocks the sensor to perform a self-check for "false-on" failures. | | **Signal Processor** | An integrated circuit that analyzes the frequency and intensity of the signal to distinguish between a real flame and background radiation. | | **Relay/Output Stage** | Provides a dry contact or voltage output to the burner management system (BMS). | --- ### Technical Specifications (Typical) Electronic performance is defined by the following parameters: * **Spectral Sensitivity:** Generally tuned to **185 to 260 nm** (Ultraviolet range) to avoid interference from visible light or refractory glow. * **Operating Voltage:** Typically 100V AC or 200V AC (depending on the specific sub-model). * **Response Time:** * *Flame Detection:* < 1 second. * *Flame Failure (Flameout):* < 2-4 seconds. * **Ambient Temperature Rating:** Usually rated for up to 60°C or 70°C for the electronic housing. --- ### Terminal Connections The electronic interface usually follows a standard wiring diagram for integration into control panels: ```yaml Terminal 1-2: Power Supply Input (e.g., 100/200V AC) Terminal 3-4: Flame Signal Output (Dry contact relay) Terminal 5: Ground / Shield ``` ### Key Maintenance Features 1. **Sensitivity Adjustment:** Some versions contain a potentiometer to adjust the threshold for flame detection. 2. **LED Indicators:** Electronic status lights (often green for power, red for flame detection) allow for immediate visual diagnostics. ---