The part number **FRTD-R-K3-K/Q** typically refers to a high-precision Temperature Sensor assembly, specifically a **Resistance Temperature Detector (RTD)** used in industrial process control and thermal management. Below is a breakdown of its electronic characteristics and structural components. ### 1. Technical Specifications The following table outlines the likely specifications based on the standard naming conventions for this series: | Feature | Specification | Description | | :--- | :--- | :--- | | **Sensor Type** | RTD (Pt100 or Pt1000) | Uses platinum elements for linear resistance change. | | **Wiring Config** | 3-Wire (K3) | Compensates for lead wire resistance to improve accuracy. | | **Calibration** | Class A / Class B | Typically follows IEC 60751 standards for tolerance. | | **Material** | Stainless Steel | Usually 316SS for corrosion resistance. | | **Connection** | K/Q Series | Specific connector or terminal head housing style. | --- ### 2. Electronic Component Breakdown #### A. The Sensing Element (The "RTD") At the core of the FRTD is a thin-film or wire-wound platinum resistor. * **Operating Principle:** As temperature increases, the electrical resistance of the platinum increases. * **Characteristic Equation:** $R_t = R_0(1 + At + Bt^2)$ (Callendar-Van Dusen equation). #### B. 3-Wire Configuration (K3) The "K3" designation indicates a 3-wire lead system. This is an electronic bridge circuit design: 1. **Wire 1 & 2:** Carry the excitation current. 2. **Wire 3:** Acts as a sense line to measure the voltage drop across the leads. 3. **Benefit:** This cancels out the resistance of the wires themselves, allowing for accurate readings over long distances. #### C. Termination & Housing (K/Q) The suffix often refers to the physical "Quick-Connect" or "Terminal Head" style. * **Connector:** Often a circular M12 or a proprietary industrial plug. * **Protection:** Usually rated IP65 or higher to protect electronic contacts from moisture and dust. --- ### 3. Application Use Cases * **HVAC Systems:** Monitoring chilled water or air ducts. * **Semiconductor Manufacturing:** Precise cooling plate temperature control. * **Industrial Ovens:** Feedback loops for PID controllers. ---