Based on the part number **FRTD-R-H2-L**, this component is a high-precision **Thin Film Platinum Resistance Temperature Detector (RTD)**. These sensors are widely used in industrial and medical applications due to their linear resistance-to-temperature relationship and long-term stability. --- ### 1. Technical Specifications Breakdown The alphanumeric code typically defines the physical and electrical characteristics of the sensor: | Feature | Specification Details | | :--- | :--- | | **Sensor Type** | Platinum Thin Film (Pt100 or Pt1000) | | **Base Resistance** | Usually 100 $\Omega$ or 1000 $\Omega$ at 0°C | | **Temperature Coefficient** | 3850 ppm/K (Standard DIN/IEC 60751) | | **Tolerance Class** | Class A or Class B (Determined by the "H2" suffix) | | **Lead Configuration** | Radial Leads (The "R" indicates radial leads) | | **Length/Size** | "L" often denotes lead wire length or a specific package size | --- ### 2. Key Electronic Characteristics * **Operating Temperature Range:** Typically ranges from **-50°C to +400°C** (depending on the specific encapsulation). * **Accuracy:** Being an RTD, it offers higher accuracy and repeatability compared to thermistors or thermocouples. * **Self-Heating:** Low self-heating coefficient, ensuring that the current passing through the sensor doesn't significantly alter the temperature reading. * **Response Time:** Rapid response due to the thin-film construction on a ceramic substrate. --- ### 3. Construction and Materials 1. **Substrate:** A high-purity ceramic base (Alumina). 2. **Resistive Layer:** A thin layer of Platinum sputtered onto the ceramic. 3. **Patterning:** The platinum is laser-trimmed to reach the precise resistance value (e.g., 100.00 $\Omega$). 4. **Protection:** A glass or epoxy coating protects the platinum film from humidity and mechanical stress. 5. **Leads:** Usually made of Nickel or Platinum-clad wire to handle high-temperature soldering or welding. --- ### 4. Circuit Implementation To read the signal from an **FRTD-R-H2-L**, a constant current source is required to measure the voltage drop ($V = I \times R$). Because the resistance changes are small, the following circuits are common: ```c // Example: Basic Wheatstone Bridge Calculation Logic float calculateTemperature(float resistance) { float R0 = 100.0; // Resistance at 0°C float alpha = 0.003851; // Standard temperature coefficient return (resistance - R0) / (R0 * alpha); } ``` ---