The **M2RTS-R-CD-R2/Q** is a high-precision, plug-in type RTD (Resistance Temperature Detector) transmitter belonging to the M2-Series by **M-System**. It is designed to convert signals from an RTD into a standard DC output (current or voltage) while providing galvanic isolation. Below is a breakdown of its electronic specifications and features. ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Input Type** | RTD (e.g., Pt 100, Pt 1000, Ni 508.4) | | **Output Type** | DC Voltage or Current (Configurable) | | **Power Input (R)** | 24V DC | | **Isolation** | 3-way (Input to Output to Power) | | **Mounting** | Plug-in base (DIN rail or surface) | | **Accuracy** | ±0.1% of span | | **Response Time** | ≤ 0.5 seconds (0 - 90%) | --- ### 2. Functional Description The device processes the thermal resistance signal through several electronic stages: * **Linearization Circuit:** RTDs are inherently non-linear. This unit includes built-in linearization to ensure the output signal is directly proportional to the temperature. * **Burnout Protection:** It features a burnout detection circuit. If the RTD sensor wire breaks, the transmitter will force the output to a specific limit (Upscale or Downscale) to alert the control system. * **3-Way Isolation:** It uses optical or magnetic coupling to isolate the input, output, and power supply. This protects sensitive PLC/DCS equipment from ground loops and high-voltage surges. --- ### 3. Model Code Breakdown (Suffixes) The specific part number provides details on the electronic configuration: * **M2RTS:** Base model for RTD Transmitter. * **-R:** Power Input (24V DC). * **-CD:** Output Codes (C: 4–20mA DC; D: 0–20mA DC, depending on internal settings). * **-R2:** Specific version/series revision for the M2 family. * **/Q:** This usually indicates a **Special Option**. Common "Q" options include: * Specific calibration certificates. * Tropicalization (coating for high humidity). * Modified response times. --- ### 4. Wiring Diagram (Electronic Interface) ```mermaid graph LR A[RTD Sensor] -->|3-Wire| B(M2RTS Transmitter) B -->|Isolated DC| C[PLC / Controller] D[24V DC Source] --> B ``` ---