The **FRTD-R-154-P** is a high-precision temperature sensing component, specifically a **Resistance Temperature Detector (RTD)**. It is widely used in industrial applications where accurate monitoring of gases or liquids is required. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature used by manufacturers (typically related to brands like Watlow or similar thermal control specialists). | Feature | Specification | | :--- | :--- | | **Sensor Type** | Pt100 (Platinum Resistance) | | **Resistance at 0°C** | 100 Ohms | | **Temperature Coefficient** | 0.00385 $\Omega/\Omega/°C$ (DIN/IEC Standard) | | **Configuration** | 3-Wire (Standard for lead wire compensation) | | **Probe Material** | 316 Stainless Steel (Corrosion Resistant) | | **Standard Accuracy** | Class A or Class B (varies by batch) | --- ### 2. Physical Construction The "R-154" portion of the code often refers to the physical dimensions and mounting style: * **Sheath Diameter:** Usually 1/4 inch (or metric equivalent). * **Insertion Length:** Specified by the "154" code, often correlating to a 4-inch or 6-inch probe length depending on the specific series catalog. * **Connection Head:** The "P" often denotes a **Plug** or **Process Connection** (like a NPT thread) that allows it to be screwed directly into a pipe or thermowell. --- ### 3. Operating Principle The device operates on the principle of **linear resistance change**: 1. As the ambient temperature around the probe increases, the electrical resistance of the platinum element increases. 2. The **3-wire configuration** uses the third wire to measure the resistance of the lead wires themselves. 3. The controller subtracts the lead resistance from the total measurement, ensuring that the final temperature reading is not skewed by the length of the cable. --- ### 4. Typical Applications * **HVAC Systems:** Monitoring chilled water or steam lines. * **Food & Beverage:** Pasteurization or storage temperature monitoring. * **Chemical Processing:** Measuring reactive fluids in tanks. * **Plastic Injection Molding:** Precise control of melt temperatures. --- ### 5. Wiring Diagram Logic In a standard 3-wire setup for this part: ```text Terminal A (Red) ----[ Platinum Element ]---- Terminal B (White) | ------ Terminal C (White) ``` *The two white wires are internally connected to one side of the sensor to allow for lead-wire compensation.*