The **GSA2.5-R** typically refers to a high-precision, industrial-grade **Spring-Return Linear Potentiometer** or a **Linear Displacement Sensor**. These components are used to measure mechanical position or displacement and convert it into an electrical signal. --- ### 1. Key Technical Specifications The electrical characteristics of the GSA2.5-R are designed for accuracy and durability in automation environments. | Feature | Specification (Typical) | | :--- | :--- | | **Sensor Type** | Conductive Plastic Potentiometer | | **Stroke Length** | 2.5 mm | | **Resistance Range** | 1 kΩ / 2 kΩ (standard) | | **Linearity** | ±0.1% to ±0.5% | | **Input Voltage** | Max 24V - 30V DC | | **Resolution** | Infinite (Analog) | | **Return Mechanism** | Internal Spring (Automatic reset) | --- ### 2. Internal Electronic Structure The GSA2.5-R functions as a **voltage divider**. Its internal electronic construction consists of three primary parts: 1. **Conductive Plastic Track:** A high-resolution resistive element that offers long life (often up to 100 million cycles) compared to wire-wound versions. 2. **Wiper (Contact):** A multi-finger precious metal contact that slides along the track as the shaft moves. 3. **Spring Return:** A mechanical spring that ensures the shaft returns to the "zero" or extended position when external pressure is removed. ### 3. Wiring Diagram (3-Pin Configuration) Most GSA2.5-R sensors utilize a standard 3-wire interface. | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | Input (-) | Ground / Negative terminal | | **2** | Signal (Out) | Variable voltage output (wiper) | | **3** | Input (+) | Excitation voltage (VCC) | --- ### 4. Applications Because of its small stroke (2.5mm) and spring-return feature, it is commonly used for: * **Quality Control:** Measuring the thickness or flatness of small components. * **Valve Positioning:** Monitoring the micro-movements of hydraulic or pneumatic valves. * **Robotics:** Tactile sensing or end-stop detection. * **Medical Equipment:** High-precision calibration of surgical tools. --- ### 5. Installation Precautions * **Current Limit:** Ensure the wiper current does not exceed **1mA** to prevent burning the conductive track. * **Signal Conditioning:** It is recommended to use a high-impedance operational amplifier (Op-Amp) to read the output signal to maintain linearity. * **Environment:** While many are rated IP65, avoid submerging the shaft entry point in liquids unless specified.