The **FLCS-05-R/K** is a specific series of liquid leak detection sensors, commonly used in industrial environments, semiconductor manufacturing, and data centers. These parts are typically designed for high sensitivity and reliability. Below is a breakdown of the electronic components and technical specifications for this series. --- ## 1. Technical Specifications The FLCS series (specifically the -05-R/K variants) are point-sensors or optical sensors designed to detect the presence of liquids. | Feature | Specification | | :--- | :--- | | **Operating Voltage** | 12V to 24V DC | | **Current Consumption** | $\approx$ 15mA to 30mA (Typical) | | **Output Type** | NPN Open Collector (usually) | | **Response Time** | < 1 second | | **Material** | PFA (Perfluoroalkoxy) or PP (Polypropylene) | | **Indicator** | LED (Red = Leak, Green/Off = Normal) | --- ## 2. Key Electronic Parts & Functionality ### A. Optical Sensing Unit (Infrared) The "heart" of the device is an **Infrared (IR) Emitter and Receiver**. * **Physics:** It utilizes the principle of total internal reflection. When no liquid is present, the IR beam reflects back to the receiver. * **Detection:** When liquid touches the sensor tip, the refractive index changes, causing the light to escape into the liquid. The receiver detects this loss of light and triggers the alarm. ### B. The Comparator Circuit Internal to the sensor is a small PCB containing a **Comparator IC** (like an LM393 variant). * It compares the voltage from the IR receiver against a set threshold. * This ensures that small amounts of condensation or dust don't trigger a false positive. ### C. Output Transistor The part uses a transistor (usually a **BJT or MOSFET**) to handle the output signal. * **-R/K Suffix:** Often denotes the wiring configuration or the logic state (e.g., Normally Closed vs. Normally Open). * **Protection:** Most units include a **Zener Diode** or a **Varistor** to protect the internal electronics from voltage spikes on the power line. ### D. Signaling Interface The sensor typically has a 3-wire or 4-wire interface: 1. **VCC (+):** Power input. 2. **GND (-):** Common ground. 3. **OUT (Signal):** The lead that connects to a PLC (Programmable Logic Controller) or an alarm panel. --- ## 3. Wiring Configuration Most FLCS-05 models follow a standard industrial color code: ```yaml Brown: +V (12-24V DC) Blue: 0V (Ground) Black: Control Output (NPN) ``` --- ## 4. Maintenance and Reliability Because these sensors are often used with hazardous chemicals, the electronics are **fully encapsulated** (potted) in resin. This provides: * **Chemical Resistance:** Protection against acid/alkali vapors. * **Vibration Resistance:** Ensures the delicate IR alignment isn't disrupted by machinery.