The **W2TS-113-R/CE** is a high-precision, industrial-grade **Pt100 Resistance Temperature Detector (RTD)** sensor. It is specifically designed for surface temperature measurement, often used in automation, HVAC, and industrial machinery. --- ### 1. Technical Specifications The following table outlines the core electronic and physical characteristics of the sensor: | Feature | Specification | | :--- | :--- | | **Sensor Type** | Pt100 (Platinum Resistance) | | **Resistance at 0°C** | 100 $\Omega$ | | **Temperature Range** | -50°C to +150°C (standard range) | | **Tolerance Class** | Class A (High Precision) | | **Wiring Configuration** | 3-wire (for lead resistance compensation) | | **Probe Material** | Stainless Steel / Nickel-plated Copper (Surface type) | | **Cable Type** | Silicon or PVC with R-type connector | --- ### 2. Key Electronic Components #### A. The Pt100 Element The "heart" of the device is a platinum film or wire. As the temperature increases, the electrical resistance of the platinum increases in a highly linear and predictable manner. * **Coefficient:** $\alpha = 0.00385$ (Standard DIN/IEC 60751). #### B. 3-Wire Configuration The "113" designation often refers to the specific wiring harness. * **Purpose:** The third wire allows the measuring instrument (PLC or Controller) to measure the resistance of the lead wires themselves and subtract it from the total resistance. * **Benefit:** This ensures that the length of the cable does not cause errors in the temperature reading. #### C. Connector (R/CE) * **R:** Indicates a specific connector type (often a circular or rectangular plug-in) for quick installation. * **CE:** Certification mark indicating compliance with European safety, health, and environmental protection standards. --- ### 3. Application Circuit Example To read this sensor, it is typically connected to a **Wheatstone Bridge** circuit or a dedicated **RTD-to-Digital Converter** (like the MAX31865). ```python # Conceptual logic for calculating Temperature from Resistance def calculate_temp(resistance): R0 = 100.0 # Resistance at 0 degrees alpha = 0.00385 # Formula: Rt = R0 * (1 + alpha * T) temperature = (resistance - R0) / (R0 * alpha) return temperature print(f"Temp for 138.5 Ohms: {calculate_temp(138.5)} C") ``` --- ### 4. Typical Usage Scenarios 1. **Surface Monitoring:** Measuring the heat of motor housings or heat sinks. 2. **HVAC Systems:** Monitoring pipe surface temperatures without piercing the line. 3. **Industrial Automation:** Feeding data into a PID controller to maintain process stability.