The **KSL-E3-R** is an electronic component primarily classified as a **Liquid Level Sensor** (or Float Switch), often utilized in industrial machinery, water treatment systems, and household appliances. --- ## 1. Core Specifications The electrical characteristics are critical for ensuring the longevity of the sensor. Exceeding these values can fuse the internal reed contact. | Parameter | Specification | | :--- | :--- | | **Contact Type** | Reed Switch (Normally Open/Closed) | | **Max Switching Voltage** | 100V DC / 250V AC | | **Max Switching Current** | 0.5A | | **Contact Resistance** | < 100 mΩ | | **Operating Temperature** | -10°C to +85°C | | **Material** | PP (Polypropylene) or Stainless Steel (variant dependent) | --- ## 2. Operating Principle The device operates on the principle of **magnetic induction**: 1. **The Float:** Contains a permanent ring magnet inside the buoyant housing. 2. **The Stem:** Contains a stationary **Reed Switch** hermetically sealed inside the central tube. 3. **The Action:** As the liquid level rises or falls, the float moves along the stem. When the magnet aligns with the reed switch, the magnetic field forces the internal metal blades to touch, completing the circuit. --- ## 3. Electronic Configuration & Installation While the KSL-E3-R is a simple passive switch, its integration requires specific electronic considerations: ### Reversibility Most models allow you to change the logic from **NO (Normally Open)** to **NC (Normally Closed)** by removing the C-clip at the bottom, flipping the float upside down, and reinstalling it. ### Circuit Protection Because reed switches are sensitive to "arcing," the following protections are recommended: * **Inductive Loads:** If controlling a relay or motor, use a **Flyback Diode** (DC) or an **RC Snubber** (AC). * **Capacitive Loads:** Use a series resistor to limit the initial inrush current. --- ## 4. Typical Wiring Diagram The KSL-E3-R usually features two wires (often black or red). ```mermaid graph LR A[Power Source] --- B(KSL-E3-R Switch) B --- C[Load / Microcontroller Pin] C --- D[Ground] ``` *Note: When connecting to a microcontroller (like Arduino), use a 10kΩ pull-up resistor to prevent floating signals.*