The **WRPPB-JAM5R-R/Q** is a high-precision electronic component, specifically a **Platinum Resistance Temperature Detector (RTD)** sensor assembly, typically used in industrial automation for high-temperature measurement. Below is a detailed breakdown of its electronic and mechanical specifications. --- ### 1. General Specifications This part is a specialized thermal probe designed for harsh environments. The model name typically breaks down into the following technical attributes: | Feature | Specification | | :--- | :--- | | **Sensor Type** | RTD (Resistance Temperature Detector) | | **Element Material** | Platinum (Pt) | | **Resistance at 0°C** | 100 Ohms (Pt100) or 1000 Ohms (Pt1000) * | | **Configuration** | Likely B-class or A-class accuracy | | **Protection Tube** | Stainless Steel or Corundum (depending on Q-variant) | | **Lead Wire System** | 3-wire system (typical for JAM series) | *\*Note: Most WRP/WRN series follow Chinese national standards (JB/T) where Pt100 is the default.* --- ### 2. Electronic Characteristics The core electronic function is based on the **positive temperature coefficient** of Platinum. * **Linearity:** High linearity over a wide temperature range compared to thermocouples. * **Measurement Range:** Typically -200°C to +450°C (standard) or up to 600°C for reinforced versions. * **Excitation Current:** Should be kept low (typically <1mA) to prevent **self-heating errors**, which can distort temperature readings. * **Stability:** Platinum RTDs are known for extremely low drift over time (usually <0.05°C per year). --- ### 3. Key Components of the Assembly The "JAM" suffix often refers to the waterproof junction box or the specific connector type used in the assembly. 1. **Sensing Element:** A thin-film or wire-wound platinum resistor encapsulated in ceramic or glass. 2. **Internal Insulation:** Magnesium Oxide (MgO) powder is often used to insulate the wires from the outer metal sheath while maintaining thermal conductivity. 3. **Connection Head (JAM):** A ruggedized enclosure (often aluminum alloy) that protects the electronic terminals from moisture and dust. 4. **Process Connection:** Threaded or flange mounting to secure the sensor into a pipe or tank. --- ### 4. Application Wiring (3-Wire Logic) To compensate for lead wire resistance, these sensors usually utilize a bridge circuit: ```cpp // Logic for Resistance to Temperature Conversion (Callendar-Van Dusen Equation) // For T > 0°C: Rt = R0 * (1 + A*t + B*t^2) float R0 = 100.0; // Resistance at 0 degrees float A = 3.9083e-3; float B = -5.775e-7; // Simplified linear approximation for small ranges: // Temperature = (Measured_Resistance - 100) / 0.385 ``` ---