The **M2RTS-R-B1-R/Q** is a high-precision, industrial-grade RTD (Resistance Temperature Detector) transmitter manufactured by **M-System**. It is part of the M2 Series, designed for signal conditioning in automation and process control. --- ## 1. Technical Specifications Overview | Feature | Specification | | :--- | :--- | | **Model Series** | M2RTS (RTD Transmitter) | | **Input Type** | RTD (e.g., Pt 100, Pt 1000, JPt 100) | | **Output Type** | DC Voltage or Current (Configurable) | | **Power Input (B)** | 100 – 240V AC | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Isolation** | 3-port isolation (Input to Output to Power) | | **Mounting** | DIN Rail Mounting | --- ## 2. Key Electronic Components & Functionality The internal electronics of the M2RTS are designed to convert a small resistance change from a temperature sensor into a standardized industrial signal. ### A. Input Section (RTD Interface) * **Constant Current Source:** The device sends a small, stable current through the RTD to measure voltage drop without causing self-heating. * **Leadwire Compensation:** It utilizes a 3-wire system to cancel out the resistance added by the length of the copper wires connecting the sensor to the transmitter. * **Burnout Protection:** Includes circuitry to detect if the sensor wire is broken, typically driving the output to a "High" or "Low" limit for safety. ### B. Signal Conditioning & Isolation * **Isolation Transformer:** Provides 2000V AC isolation between the power supply, input, and output. This prevents ground loops and protects sensitive PLC/DCS inputs from high-voltage surges. * **A/D and D/A Converters:** High-resolution converters ensure that the linear relationship between temperature and resistance is maintained with high accuracy (typically ±0.1% of span). ### C. Power Supply Section * **Switching Regulator:** The "B1" designation indicates a wide-range AC power input. The internal circuitry regulates this down to stable DC levels for the internal operational amplifiers and logic. --- ## 3. Part Number Suffix Breakdown Understanding the specific suffixes for your model: * **M2RTS**: Base model for RTD Transmitter. * **R**: Direct/Reverse action (standard response). * **B1**: Power Input (100V – 240V AC). * **R/Q**: * **R**: Specific output range code (often 4–20mA DC). * **/Q**: Denotes "External Special Options," such as specific coating for humidity or custom calibration certificates. --- ## 4. Wiring Diagram (Conceptual) ```mermaid graph LR A[RTD Sensor] -- 3-Wire -- B(Input Terminals 1,2,3) B -- Isolation -- C(Processing Logic) C -- Isolation -- D(Output Terminals 4,5) E[100-240V AC Power] -- Terminals 7,8 -- C ```