The **FLCS-1E-R/K** is a high-precision, industrial-grade liquid level sensor, typically categorized as a **Conductive Level Controller** or a related sensing probe assembly. These devices are used primarily to detect the presence of conductive liquids (like water, acids, or alkalis) in tanks or reservoirs. --- ## 1. Technical Specifications The electronic and physical characteristics of the FLCS-1E-R/K are designed for durability and signal accuracy. | Feature | Description | | :--- | :--- | | **Model Type** | Conductive Point Level Sensor | | **Electrode Material** | Stainless Steel (typically 304 or 316) | | **Insulation Material** | Resin or High-Performance Polymer (K-type often denotes specialized coating) | | **Output Signal** | Contact Closure / Relay Trigger (when paired with a controller) | | **Operating Voltage** | Low Voltage AC (to prevent electrolysis) | | **Connection Type** | R/K series often features specific threaded or flange mounts | --- ## 2. Key Electronic Components The "Electronic Parts" of this system are divided between the **Probe Head** and the **Control Logic Unit**. ### A. The Electrode Assembly * **Sensing Rods:** These act as the primary interface. When liquid touches the rod, it completes a low-current electrical circuit between the probe and the ground (tank wall or a dedicated ground rod). * **Resin Encapsulation:** The internal wiring connections within the head are typically encapsulated in epoxy resin to prevent moisture ingress and short-circuiting. ### B. The Control Circuitry (Internal or External) Most FLCS units operate on the principle of **Conductivity Switching**: 1. **Signal Generator:** Sends a low-voltage AC signal to the electrodes. AC is used instead of DC to prevent **Electrolysis** (the buildup of minerals/degradation of the metal). 2. **Sensitivity Adjustment:** Potentiometers inside the control unit allow for calibration based on the liquid's conductivity (e.g., distilled water vs. wastewater). 3. **Relay Output:** An internal electromagnetic relay or optocoupler provides a dry contact signal to a PLC or Pump Controller. --- ## 3. Configuration Breakdown (R/K Designation) The suffixes in the model number usually define the electronic housing and environmental protection: * **"R":** Often refers to a **Relay-integrated** version or a specific **Resistance** range calibration. * **"K":** Frequently indicates a **Coated Electrode** (such as Kynar/PVDF) for chemical resistance, or a specific high-temperature terminal box configuration. --- ## 4. Typical Wiring Diagram Logic While specific wiring varies by brand, the electronic logic follows this standard structure: ```mermaid graph LR A[AC Power Source] --> B[Controller] B --> C[Electrode E1 - High] B --> D[Electrode E2 - Low] B --> E[Electrode E3 - Ground] C -.->|Liquid Contact| E D -.->|Liquid Contact| E B --> F[Relay Out to Pump/Alarm] ```