The **PRM1-R100-F** is a high-performance **Platinum Resistance Temperature Detector (RTD)** sensor. It belongs to the thin-film resistor category, designed specifically for precision temperature measurement in industrial and laboratory environments. --- ### 1. Key Technical Specifications Below are the primary electronic characteristics of the PRM1-R100-F: | Feature | Specification | |:---|:---| | **Sensor Type** | RTD (Pt100) | | **Material** | Platinum (Thin Film) | | **Nominal Resistance** | 100 $\Omega$ at 0°C | | **Tolerance Class** | Class F 0.3 (formerly Class B) | | **Temperature Coefficient** | 3850 ppm/K (Standard DIN/IEC 60751) | | **Temperature Range** | -70°C to +500°C (typical for thin-film) | | **Long-term Stability** | Max $R_0$ drift < 0.04% after 1000h at 500°C | --- ### 2. Functional Principles The PRM1-R100-F operates on the principle of **Positive Temperature Coefficient (PTC)**. As the ambient temperature increases, the electrical resistance of the platinum element increases in a predictable, linear fashion. #### Resistance-Temperature Equation For the range of $0^\circ C$ to $850^\circ C$, the resistance is calculated using the Callendar-Van Dusen equation: `R(t) = R0 * (1 + A*t + B*t^2)` Where: * **R0**: 100 $\Omega$ * **A**: $3.9083 \times 10^{-3} ^\circ C^{-1}$ * **B**: $-5.775 \times 10^{-7} ^\circ C^{-2}$ --- ### 3. Physical Construction The "R100" indicates the resistance value, while the "F" typically refers to the tolerance class or the lead-wire configuration. * **Substrate:** Usually a ceramic base onto which a thin layer of platinum is sputtered. * **Protection:** The platinum film is covered with a glass or epoxy layer to protect against mechanical damage and oxidation. * **Lead Wires:** Typically gold-coated nickel or silver wires for easy soldering or welding. --- ### 4. Implementation Details To integrate this part into an electronic circuit, the following considerations apply: 1. **Excitation Current:** To avoid **self-heating** errors, the current passed through the sensor should be kept low (typically **0.3 mA to 1.0 mA**). 2. **Connection Modes:** * *2-Wire:* Simplest, but lead resistance adds error. * *3-Wire:* Compensates for lead wire resistance (standard in industrial PLCs). * *4-Wire:* Highest precision; eliminates lead wire error entirely. 3. **Signal Conditioning:** Usually requires a Wheatstone Bridge or a dedicated RTD-to-Digital converter (like the MAX31865).