The **FRTD-R-0D-P** is a specific model within the series of **Flat-Type Platinum Resistance Temperature Detectors (RTD)**. These components are precision sensors used to measure temperature based on the correlation between the electrical resistance of platinum and its temperature. --- ### 1. Key Technical Specifications Based on the standard nomenclature for the FRTD series, here are the primary electronic characteristics: | Parameter | Specification | | :--- | :--- | | **Sensor Type** | Thin-film Platinum RTD | | **Base Resistance** | 100 $\Omega$ at 0°C (Pt100) | | **Tolerance Class** | Class B (usually $\pm$0.3°C at 0°C) | | **Temperature Coefficient** | 3850 ppm/K (Standard DIN/IEC 60751) | | **Operating Range** | Typically -50°C to +400°C (varies by lead material) | | **Dimensions** | Flat/Small footprint for surface mounting | --- ### 2. Breakdown of the Part Number While naming conventions can vary slightly by manufacturer (such as Hayashi Denko or similar Japanese precision manufacturers), the code typically breaks down as follows: * **FRTD**: **F**lat **R**esistance **T**emperature **D**etector. Indicates the thin-film technology. * **R**: Indicates the sensor element is packaged in a specific resin or ceramic plate for protection. * **0D**: Often refers to the physical size or lead wire configuration (e.g., 2.0mm width). * **P**: Indicates **Platinum** (Pt) as the resistive element. --- ### 3. Electronic Composition The internal structure of the FRTD-R-0D-P consists of three main layers: 1. **Ceramic Substrate:** A high-purity alumina base that provides mechanical strength and electrical insulation. 2. **Platinum Thin Film:** A microscopic layer of platinum sputtered onto the ceramic. This layer is laser-trimmed to achieve the exact 100 $\Omega$ resistance. 3. **Glass Passivation:** A protective glass coating applied over the platinum film to shield it from oxidation and moisture. 4. **Lead Wires:** Usually made of nickel or platinum-clad wire, welded to the film contact points. --- ### 4. Application and Usage Because this part is "Flat-Type," it is electronically optimized for: * **Surface Temperature Sensing:** Ideally suited for being taped or glued to flat surfaces (like heat sinks or battery packs). * **High Vibration Environments:** The thin-film construction is more robust against mechanical shock compared to wire-wound RTDs. * **Linearity:** It provides a highly linear output compared to thermistors, making it easier for Microcontrollers (ADCs) to process the data. --- ### 5. Measurement Circuitry To use this part electronically, it is typically integrated into a **Wheatstone Bridge** or a **Constant Current Source** circuit. ```python # Standard Pt100 Resistance-to-Temperature (Callendar-Van Dusen) # R(t) = R0 * (1 + A*t + B*t^2) R0 = 100.0 # Resistance at 0°C A = 3.9083e-3 B = -5.775e-7 def get_resistance(temp): return R0 * (1 + A * temp + B * temp**2) ```