The **FRTD-R-62-R** is a specific electronic component within the category of **Resistive Temperature Detectors (RTDs)**. It is primarily used for precision temperature measurement in industrial and laboratory environments. ### 1. General Specifications The part number follows a specific nomenclature used by manufacturers (typically associated with brands like **Fuji Electric** or specialized sensor providers). | Feature | Specification | | :--- | :--- | | **Type** | Platinum Resistance Thermometer (Pt100) | | **Resistance at 0°C** | 100 $\Omega$ | | **Configuration** | 3-Wire or 4-Wire (model dependent) | | **Tolerance Class** | Class A or Class B (per IEC 751) | | **Operating Range** | Typically -50°C to +250°C (Standard) | --- ### 2. Physical Construction The "62" in the part number often refers to the physical dimensions of the sensor element or the probe casing. * **Sensing Element:** A thin-film platinum layer deposited on a ceramic substrate. * **Encapsulation:** Usually housed in a stainless steel tube (SUS304 or SUS316) for corrosion resistance. * **Lead Wires:** High-temperature insulated wires (Teflon or Fiberglass) to prevent melting near the heat source. --- ### 3. Key Electronic Characteristics RTDs like the FRTD-R-62-R work on the principle of **Positive Temperature Coefficient (PTC)**. As the temperature rises, the electrical resistance increases in a highly linear and predictable manner. #### The Callendar-Van Dusen Equation The resistance ($R_t$) at temperature ($t$) is calculated as: `$R_t = R_0 [1 + At + Bt^2 + C(t-100)t^3]$` * **Accuracy:** Offers higher stability and repeatability compared to thermocouples. * **Self-Heating:** Requires a low excitation current (typically < 1mA) to prevent internal heat from skewing the measurement. --- ### 4. Typical Applications * **HVAC Systems:** Monitoring duct temperatures. * **Industrial Automation:** Process control in chemical or food processing. * **Medical Equipment:** Precise monitoring of laboratory samples. * **PCB Mounting:** Small form-factor versions are soldered directly to boards for ambient monitoring. --- ### 5. Wiring Diagram Logic RTDs are rarely used with 2 wires due to lead-wire resistance errors. The "R" series usually employs a 3-wire compensation circuit: ```text Terminal A (Current In) ----+ [ Sensor ] | Terminal B (Current Out) ---+ | Terminal B' (Compensation) -+ ``` ---