## Technical Overview: SES-1B1-R (Magnetic Sensor) The **SES-1B1-R** is a specific type of **Magnetic Proximity Sensor** (often categorized under Reed Switches or Magnetic Actuators). These components are primarily used in security systems, industrial automation, and consumer electronics to detect the opening and closing of doors, windows, or panels. --- ### 1. Key Technical Specifications The following table highlights the typical electrical characteristics of the SES-1B1-R series: | Feature | Specification | | :--- | :--- | | **Contact Type** | Normally Open (N.O.) | | **Switching Voltage** | Max 100V DC / AC | | **Switching Current** | Max 0.5A | | **Contact Rating** | 10W (Max Power) | | **Sensing Distance** | 15mm to 25mm (Typical) | | **Housing Material** | ABS Plastic / Flame Retardant | | **Operating Temperature** | -20°C to +80°C | --- ### 2. Functional Components The device consists of two main physical parts that work in tandem: 1. **The Sensor (Reed Switch):** This contains two ferromagnetic blades (reeds) sealed in a glass tube. In the SES-1B1-R, the switch is usually "Normally Open," meaning the circuit is broken when no magnet is near. 2. **The Actuator (Magnet):** A permanent magnet housed in a matching casing. 3. **Terminal Wiring:** Usually features two leads (red/black or white) for integration into a control loop or microcontroller (like an Arduino/ESP32). --- ### 3. Working Principle The SES-1B1-R operates based on **Magnetic Field Induction**: * **Closed State:** When the magnet (actuator) is brought close to the sensor, the magnetic field pulls the internal reeds together. This completes the electrical circuit. * **Open State:** When the magnet is moved away (e.g., a door opens), the magnetic field weakens, the reeds spring apart, and the circuit is broken. --- ### 4. Common Applications * **Security Systems:** Detecting unauthorized entry through windows or doors. * **Industrial Automation:** Limit switching for moving machine parts. * **Home Appliances:** Sensing if a lid is closed (e.g., a washing machine or printer). * **Level Sensing:** Can be used with a float magnet to detect liquid levels. --- ### 5. Installation Note To ensure the SES-1B1-R operates reliably, the sensor and magnet should be aligned **parallel** to each other. If the gap between the two exceeds the rated "Sensing Distance" (usually >25mm), the switch may fail to trigger.