The **FRTD-R-4W2-L** is a precision temperature sensing component, specifically a **Resistance Temperature Detector (RTD)**. It is commonly used in industrial and laboratory environments where high-accuracy temperature monitoring is required. --- ### 1. Technical Specifications The part number follows a standard nomenclature for industrial sensors. Below are the primary electronic characteristics: | Parameter | Specification | Description | |:---|:---|:---| | **Sensor Type** | RTD (Pt100) | Platinum-based resistor with 100 $\Omega$ at 0°C. | | **Wiring Config** | 4-Wire | Eliminates lead-wire resistance for maximum accuracy. | | **Class/Tolerance** | Class A / 1/10 DIN | High precision (standard is usually ±0.15°C at 0°C). | | **Connection** | L-Shaped / Lead | Refers to the physical lead orientation or termination. | | **Element Type** | Thin Film | Provides fast response times and vibration resistance. | --- ### 2. Breakdown of the Model Code * **FRTD:** Flexible/Film Resistance Temperature Detector. * **R:** Rectangular or Round probe housing (depending on specific manufacturer series). * **4W:** 4-Wire configuration. This is the gold standard for electronics because it uses two wires to carry the current and two separate wires to measure the voltage drop, negating the resistance of the cables themselves. * **2:** Diameter or Length code (typically 2mm diameter or a specific probe length). * **L:** Lead wire length or "Long" variant. --- ### 3. Electronic Operation The FRTD-R-4W2-L operates on the principle of the **Positive Temperature Coefficient (PTC)**. As the ambient temperature increases, the electrical resistance of the platinum element increases in a highly predictable, linear fashion. #### Typical Wiring Diagram ```text (Red) Source (+) ----[ Platinum ]---- (White) Source (-) (Red) Sense (+) ----[ Element ]---- (White) Sense (-) ``` *By using a 4-wire bridge circuit, the measurement device can ignore the resistance of the extension wires, which is critical if the sensor is located far from the controller.* --- ### 4. Key Applications 1. **HVAC Systems:** High-end climate control where precision is vital. 2. **Medical Equipment:** Monitoring sensitive chemical reactions or storage. 3. **Automotive Testing:** Measuring fluid or intake temperatures. 4. **Industrial Automation:** Integration into PLC (Programmable Logic Controller) systems using RTD input modules.