The **FRTD-R-A11-R** is a specific electronic component, typically categorized as a **Thin Film Resistance Temperature Detector (RTD)**. These sensors are widely used for precision temperature measurement in industrial, automotive, and medical applications. --- ### 1. Technical Specifications The part number typically follows a standard convention for platinum resistance thermometers (PRTs). Below are the core electronic characteristics: | Property | Specification | Details | | :--- | :--- | :--- | | **Sensor Type** | RTD | Platinum-based resistance sensor | | **Resistance at 0°C** | 100 $\Omega$ | Commonly referred to as **Pt100** | | **Temperature Coefficient** | 3850 ppm/K | Standard DIN/IEC 60751 curve | | **Tolerance Class** | Class A | High accuracy ($\pm 0.15^\circ C$ at 0°C) | | **Package/Format** | Radial Lead | "R" suffix usually denotes radial leaded form | | **Operating Range** | -50°C to +500°C | Dependent on specific encapsulation | --- ### 2. Physical Construction The FRTD series utilizes **Thin Film Technology**, which offers several advantages over traditional wire-wound sensors: 1. **Ceramic Substrate:** A high-purity alumina base provides structural integrity. 2. **Platinum Layer:** A thin layer of platinum is deposited onto the substrate using vacuum evaporation or sputtering. 3. **Laser Trimming:** The resistance value is precisely adjusted by cutting a pattern into the platinum film with a laser. 4. **Glass Encapsulation:** A protective glass coating shields the platinum film from humidity and mechanical damage. --- ### 3. Electronic Operation The sensor operates on the principle of the **Positive Temperature Coefficient (PTC)**. As the ambient temperature increases, the physical vibrations of the platinum atoms increase, causing higher resistance to electron flow. #### Resistance Calculation The relationship between temperature ($T$) and resistance ($R_t$) is defined by the Callendar-Van Dusen equation: ```python # Simplified linear approximation for 0°C to 100°C # Rt = R0 * (1 + alpha * T) R0 = 100.0 # Resistance at 0 degrees Celsius alpha = 0.00385 # Temperature coefficient temp = 25.0 # Measured temperature resistance_at_25 = R0 * (1 + alpha * temp) # Result: 109.625 Ohms ``` --- ### 4. Typical Applications * **HVAC Systems:** Precision monitoring of air and fluid temperatures. * **Medical Equipment:** Skin temperature sensors or laboratory incubators. * **Industrial Automation:** Overheat protection for motors and power electronics. * **Automotive:** Exhaust gas or intake air temperature sensing.