The **FRTD-S-C3-R** is a specific model within a series of temperature sensors, typically identified as a **Platinum Resistance Temperature Detector (RTD)**. These components are used for precision temperature measurement in industrial, automotive, or laboratory environments. --- ### 1. Technical Specifications Table The following table summarizes the typical electronic characteristics of an RTD sensor with this nomenclature: | Parameter | Specification | Description | | :--- | :--- | :--- | | **Sensor Type** | Pt100 / Pt1000 | Platinum-based resistive element | | **Resistance at 0°C** | 100 $\Omega$ (Standard) | Reference resistance value | | **Tolerance Class** | Class A or B | Accuracy level (DIN EN 60751) | | **Temperature Range** | -50°C to +400°C | Operational limits (varies by housing) | | **Lead Configuration** | 2, 3, or 4 wires | "C3" often denotes a **3-wire** configuration | | **Material** | Stainless Steel / Ceramic | Protective sheath or substrate material | --- ### 2. Breakdown of the Model Name (Nomenclature) Electronic part numbers are usually codes for specific features: * **FRTD:** Flexible or Flat Resistance Temperature Detector. * **S:** Small or Slim profile housing. * **C3:** This typically refers to the **3-wire compensation circuit**. This is critical because it cancels out the lead wire resistance, ensuring more accurate readings over long distances. * **R:** Generally indicates **RoHS Compliance** or **Radial** lead orientation. --- ### 3. Electronic Operating Principle The FRTD-S-C3-R operates based on the **Positive Temperature Coefficient (PTC)** of Platinum. 1. **Resistance Change:** As the ambient temperature rises, the electrical resistance of the platinum element increases in a highly linear and predictable manner. 2. **3-Wire Circuit:** By using three wires (the "C3" designation), the measurement system can measure the resistance of the loop and subtract the resistance of the wires themselves. 3. **Excitation Current:** To read the sensor, a small, constant current (usually $1mA$ or less) is passed through the device. The resulting voltage drop ($V = I \times R$) is measured and converted to a temperature value. --- ### 4. Key Applications * **HVAC Systems:** Monitoring air and fluid temperatures. * **Industrial Automation:** Overheat protection for motors or bearings. * **Medical Equipment:** Precise thermal management in diagnostic devices. * **Automotive:** Exhaust gas or oil temperature sensing.