The part number **FRTD-R-4WE-K/Q** typically refers to a specialized **Resistance Temperature Detector (RTD)** sensor assembly, often used in industrial automation and precision thermal monitoring. Below is a breakdown of the electronic and physical characteristics associated with this component type. ### 1. Technical Specifications | Parameter | Specification Details | | :--- | :--- | | **Sensor Type** | Platinum Resistance (Pt100 or Pt1000) | | **Wiring Configuration** | 4-Wire (Bridge-compensated) | | **Tolerance Class** | Class A or Class B (per IEC 60751) | | **Housing Material** | Stainless Steel / High-temp Ceramic | | **Connection Type** | Terminal Block or Lead Wire with Connector | --- ### 2. Breakdown of the Component Name While specific manufacturer prefixes can vary, the nomenclature generally indicates the following: * **FRTD:** Flexible or Flat Resistance Temperature Detector. * **4WE:** Indicates a **4-Wire Electronic** configuration. This is the most accurate wiring method as it eliminates the effect of lead wire resistance on the measurement. * **K/Q:** Usually denotes the specific calibration curve or the connector type (e.g., "K" for Kelvin-style sensing or "Q" for a Quick-disconnect termination). --- ### 3. Electronic Functionality The FRTD operates on the principle that the electrical resistance of a metal (usually Platinum) changes predictably with temperature. 1. **The Sensing Element:** Inside the probe is a thin film or wire-wound resistor. At $0^\circ C$, a Pt100 sensor will measure exactly $100\Omega$. 2. **The 4-Wire Advantage:** * Two wires carry the excitation current ($I$). * Two wires measure the voltage drop ($V$) directly across the sensor element. * **Result:** The resistance of the long lead wires does not enter the calculation ($R = V/I$), making it ideal for high-precision laboratory or industrial use. --- ### 4. Typical Applications * **HVAC Systems:** Monitoring duct temperatures where long cable runs are required. * **Industrial Ovens:** High-accuracy feedback for PID controllers. * **Medical Equipment:** Precise thermal regulation for laboratory samples. * **Semiconductor Manufacturing:** Monitoring wafer temperatures in cleanrooms. ---