The **WRPP-DAJ-R2/Q** is a high-precision industrial temperature sensor, specifically a **Right-Angle Handheld Surface Thermocouple** (Type S/R/K/E compatible, though typically Type K or E in this configuration). It is designed for measuring the temperature of stationary or moving solid surfaces. --- ### 1. Key Technical Specifications | Feature | Specification Details | | :--- | :--- | | **Sensor Type** | Thermocouple (Handheld Surface Probe) | | **Graduation Code** | Usually **Type K** (Nickel-Chromium/Nickel-Alumilite) or **Type E** | | **Probe Geometry** | 90° Right-Angle (DAJ) for ergonomic access | | **Temperature Range** | 0°C to 600°C (standard) or up to 800°C (enhanced) | | **Response Time** | < 5 seconds (Fast response) | | **Handle Material** | High-temperature resistant plastic/Bakelite | --- ### 2. Electronic Components & Construction The device consists of several critical electronic and mechanical parts that allow for precise thermal-to-electric conversion: #### A. The Sensing Head (Thermocouple Junction) At the tip of the probe, two dissimilar metal wires are welded together. When the tip touches a surface, the temperature difference between the tip and the cold junction (at the meter) creates a micro-voltage (**Seebeck Effect**). * **WRPP specific:** Uses a thin-strip or "leaf" spring sensing element to ensure maximum surface contact area. #### B. Compensating Lead Wire The cable is not standard copper. It uses **Compensating Wires** made of materials that match the thermoelectric characteristics of the thermocouple itself. This prevents "parasitic" voltages from forming at the connection points, which would lead to inaccurate readings. #### C. Inner Insulation The internal wires are typically insulated with **Magnesium Oxide (MgO)** powder or high-temp ceramic sleeves within the stainless steel tube to prevent short circuits while maintaining thermal conductivity. #### D. Signal Connection (R2/Q) * **R2:** Usually denotes the specific lead length or a specialized plug type (e.g., standard flat-pin mini-connector). * **Q:** Often refers to a reinforced spring-loaded neck near the handle to prevent cable fatigue. --- ### 3. Usage & Application Because of the **90-degree (DAJ)** bend, this part is used in specific industrial scenarios: 1. **Molds and Dies:** Measuring the internal surface temperature of metal casting molds. 2. **Bearings:** Checking for overheating in motor or turbine bearings where space is constrained. 3. **Circuit Boards:** Testing heat sink efficiency on large power electronics. ---