The **TCS-83-R/BL** refers to a specific variation of a **Touchless Capacitive Sensor** or a **Contactless Exit Button**, commonly used in access control systems and automated environments. The suffix "R/BL" typically denotes the LED feedback colors: **Red (Standby)** and **Blue (Active)**. --- ### 1. Key Electronic Components The device functions by integrating infrared sensing or capacitive proximity detection with a switching circuit. | Component | Function | | :--- | :--- | | **Infrared (IR) Transmitter** | Emits a steady beam of infrared light to detect objects within 5-15cm. | | **IR Receiver/Photodiode** | Captures reflected IR light when a hand is placed near the sensor. | | **Control IC (Microcontroller)** | Processes the signal and triggers the relay while managing LED state changes. | | **Relay (Electromechanical)** | Provides a physical "dry contact" (NO/NC/COM) to unlock doors or signal controllers. | | **Bi-color LED Ring** | Provides visual status: Blue (Active/Open) and Red (Standby/Locked). | | **Potentiometer** | Allows manual adjustment of detection distance and delay timing. | --- ### 2. Technical Specifications The electronic architecture is designed for low-voltage DC environments. * **Operating Voltage:** 12V DC to 24V DC. * **Current Consumption:** ~50mA (Active), ~30mA (Standby). * **Contact Rating:** 3A @ 30V DC / 125V AC. * **Output Mode:** NO (Normally Open), NC (Normally Closed), and COM (Common). * **Operating Life:** Over 500,000 cycles (Electronic/Mechanical). --- ### 3. Wiring Configuration The back of the TCS-83 unit usually features a 5-wire harness or terminal block: | Wire Color | Label | Description | | :--- | :--- | :--- | | **Red** | +V | Positive Power Input (12-24V DC) | | **Black** | -V | Ground / Negative Input | | **Yellow** | COM | Common Terminal for Relay | | **White** | NC | Normally Closed (Breaks circuit when triggered) | | **Green** | NO | Normally Open (Closes circuit when triggered) | --- ### 4. Adjustability Features The internal PCB (Printed Circuit Board) usually contains two small adjustment screws: 1. **Sensitivity:** Changes how close a hand must be to trigger the sensor (standard range 3cm - 15cm). 2. **Delay Timer:** Sets how long the relay stays open/closed after a trigger (typically 0.5s to 20s). ---