The **FRTD-R-01-K** is a specific electronic component typically categorized under **Thin Film Platinum Resistance Temperature Detectors (RTDs)**. These sensors are widely used in industrial and laboratory environments for precision temperature measurement. --- ### 1. Key Technical Specifications The "FRTD" series generally follows international standards for resistance. Below are the typical electronic characteristics for this specific model: | Parameter | Specification | | :--- | :--- | | **Sensor Type** | RTD (Resistance Temperature Detector) | | **Element Material** | Platinum (Pt) | | **Base Resistance** | 100 $\Omega$ at 0°C (Pt100) | | **Temperature Coefficient** | 0.003851 (DIN/IEC 751 Standard) | | **Tolerance Class** | Class A or Class B (Depending on specific batch) | | **Operating Range** | -50°C to +400°C (Typical for thin film) | --- ### 2. Internal Electronic Structure The device is manufactured using **Thin Film Technology**, which involves the following components: 1. **Ceramic Substrate:** A high-purity alumina base that provides mechanical strength and electrical insulation. 2. **Platinum Layer:** A microscopic layer of platinum is deposited onto the substrate. This layer is laser-trimmed to reach the exact 100-ohm resistance. 3. **Glass Passivation:** A thin layer of glass covers the platinum film to protect it against oxidation, moisture, and chemical contaminants. 4. **Lead Wires:** Usually made of nickel or gold-plated palladium to allow for soldering or welding to an external circuit. --- ### 3. Electronic Working Principle The FRTD-R-01-K operates on the principle of **Positive Temperature Coefficient (PTC)**. * **Resistance Change:** As the temperature increases, the thermal agitation of the platinum atoms increases, making it harder for electrons to flow. This results in an increase in electrical resistance. * **Linearity:** Unlike thermistors, the FRTD offers a highly linear relationship between temperature and resistance, governed by the Callendar-Van Dusen equation: `Rt = R0 [1 + At + Bt² + C(t - 100)t³]` --- ### 4. Typical Circuit Application To read the temperature from this part, it is usually integrated into one of the following electronic configurations: * **Wheatstone Bridge:** Used to convert the small change in resistance into a measurable voltage. * **Constant Current Source:** A small current (typically 1mA or less) is passed through the sensor. The voltage drop across the sensor is measured ($V = I \times R$) to determine the resistance and thus the temperature. * **4-Wire Kelvin Connection:** Used in high-precision applications to eliminate the resistance of the lead wires from the measurement. ---