The **M2RT-61-R2/CE** is a high-precision, industrial-grade temperature transmitter part of the M2 Series by **M-System**. It is designed to convert signals from a Resistance Temperature Detector (RTD) into a standard DC output signal. --- ### 1. General Specifications This device acts as an interface between field sensors and control systems (PLC/DCS), providing isolation and signal conditioning. | Feature | Specification | | :--- | :--- | | **Model Series** | M2 Series (Mini-M) | | **Input Type** | RTD (Pt 100, Pt 50, Ni 508.4Ω, etc.) | | **Output Type** | Current or Voltage (Configurable by suffix) | | **Power Input** | 100 – 240V AC (Standard for /CE models) | | **Isolation** | 3-way isolation (input to output to power) | | **Housing** | Plug-in style base | --- ### 2. Electronic Components & Suffix Breakdown The alphanumeric code "M2RT-61-R2/CE" defines the internal electronic configuration: * **M2RT**: RTD Transmitter (Resistance Temperature Detector). * **6**: **Output 1** - 1 to 5V DC (High impedance). * **1**: **Output 2** - 4 to 20mA DC (Standard current loop). * **R2**: **Power Input** - 11 to 27V DC (Note: In some regions, "R" indicates DC power, while "M2" base units vary). * **CE**: **Certification** - Indicates the unit is built to comply with European CE marking standards for EMC and Safety. --- ### 3. Key Electronic Features #### A. Signal Conditioning The internal circuitry linearizes the non-linear resistance changes of an RTD sensor. It utilizes a **burnout protection circuit**, which forces the output to a specific limit (upscale or downscale) if the sensor wire breaks. #### B. 3-Way Isolation The device features electronic isolation between: 1. **Input Circuit:** Protects the sensor from electrical noise. 2. **Output Circuit:** Prevents ground loops between the transmitter and the PLC. 3. **Power Supply:** Protects the internal electronics from power surges. #### C. Calibration Adjustments The front panel typically includes two multi-turn potentiometers: * **ZERO:** Adjusts the 0% output point. * **SPAN:** Adjusts the 100% output point. --- ### 4. Technical Summary Table | Parameter | Details | | :--- | :--- | | **Sampling Rate** | Approx. 200 ms | | **Accuracy** | ±0.1% of span | | **Temperature Coefficient** | ±0.015% / °C | | **Insulation Resistance** | 100 MΩ or more (500V DC) | | **Dielectric Strength** | 2000V AC @ 1 minute |