Based on the part number provided, this appears to be a specific configuration of a **Resistance Temperature Detector (RTD)** sensor, likely manufactured by a specialized industrial thermal components company (such as those used in HVAC, plastic injection molding, or laboratory equipment). --- ## 1. Breakdown of Part Number Specifications While naming conventions can vary slightly by manufacturer, the code **FRTD-R-D5-K/Q** typically breaks down as follows: | Code Segment | Parameter | Description | | :--- | :--- | :--- | | **FRTD** | Series | Flexible Resistance Temperature Detector (often refers to a thin-film or flexible lead style). | | **R** | Sensor Type | Resistance-based (Platinum RTD, usually Pt100 or Pt1000). | | **D5** | Diameter | 5.0mm diameter for the sensor probe or sheath. | | **K** | Connection | Standard Terminal Head or specific connector type. | | **Q** | Housing/Lead | Often refers to "Quick-connect" or a specific sheath material (like Stainless Steel). | --- ## 2. Core Electronic Components An RTD operates on the principle that the electrical resistance of a metal changes predictably with temperature. ### A. The Sensing Element * **Material:** Most likely Platinum (Pt). Platinum is used due to its high stability and linear resistance-to-temperature relationship. * **Accuracy Class:** Typically Class A (±0.15°C) or Class B (±0.30°C). * **Resistance at 0°C:** Standard value is 100 Ohms (Pt100). ### B. Internal Wiring Configuration To compensate for lead wire resistance, these sensors usually utilize one of the following wiring schemes: * **2-Wire:** Simple, but prone to errors from wire resistance. * **3-Wire:** (Most common) Uses a third wire to cancel out the resistance of the leads. * **4-Wire:** Highest precision; used in laboratory settings to eliminate lead resistance entirely. --- ## 3. Technical Specifications (General Estimates) | Feature | Specification | | :--- | :--- | | **Temperature Range** | -50°C to +400°C (depending on lead insulation) | | **Probe Material** | SUS304 or SUS316 Stainless Steel | | **Response Time** | < 10 seconds (in moving water) | | **Insulation Resistance** | > 100MΩ at 500V DC | --- ## 4. Typical Application Circuit When connecting this sensor to a controller or PLC, it is usually integrated into a **Wheatstone Bridge** or a dedicated RTD-to-Digital converter (like the MAX31865). ```cpp // Example: Reading an RTD value via a 10-bit ADC (Simplified Logic) float getTemperature(int adcValue) { float voltage = (adcValue * 5.0) / 1023.0; float resistance = (voltage * R_FIXED) / (V_REF - voltage); // Use Callendar-Van Dusen equation to solve for T return (resistance - 100.0) / 0.385; } ``` ---