The **RTD-R-61-K** is a specific model of a Resistance Temperature Detector (RTD) probe, typically used in industrial automation for precise temperature measurement. Below is the breakdown of its electronic and physical specifications. --- ### 1. Technical Specifications An RTD operates on the principle that the electrical resistance of a metal (usually Platinum) increases as temperature rises. | Feature | Specification | | :--- | :--- | | **Sensor Type** | RTD (Resistance Temperature Detector) | | **Element Material** | Platinum (likely Pt100) | | **Nominal Resistance** | 100 $\Omega$ at 0°C | | **Accuracy Class** | Class B (Standard) or Class A (High) | | **Wiring Configuration** | 2-wire, 3-wire, or 4-wire (3-wire is most common for "K" types) | | **Mounting** | "R" typically signifies a Threaded Fitting (e.g., R 1/4" or R 1/2") | --- ### 2. Breakdown of the Model Code While naming conventions can vary slightly by manufacturer (such as Hanwei or Shinko), the alphanumeric string generally breaks down as follows: * **RTD**: Indicates the base technology (Resistance Temperature Detector). * **R**: Often denotes a **Threaded Bolt** or **Screw-in** type mounting style. * **61**: Usually refers to the **Physical Dimensions** (e.g., a 6mm probe diameter and a specific length like 100mm or 150mm). * **K**: Frequently indicates the **Terminal/Connection type**. In many industrial catalogs, "K" represents a standard plug, a specific lead wire insulation (like Kapton or K-type thermocouple style lead), or a fixed bayonet fitting. --- ### 3. Electronic Characteristics * **Linearity:** Unlike thermocouples, the RTD-R-61-K provides a highly linear relationship between temperature and resistance, making it easier for PLCs (Programmable Logic Controllers) to interpret. * **Stability:** This part is designed for long-term stability with very low "drift" compared to thermistors. * **Excitation Current:** To read the temperature, a small current (typically **1mA**) is passed through the sensor. Higher currents can cause "self-heating," which leads to measurement errors. * **Alpha Coefficient:** Most Pt100 sensors use the standard coefficient of **0.00385 $\Omega$/$\Omega$/°C**. --- ### 4. Typical Applications * Plastic injection molding machines. * Packaging machinery. * HVAC system monitoring. * Liquid temperature sensing in small-bore piping. ---