The **M2RTS-R-B2-R2** is a specific model of a **Resistance Temperature Detector (RTD) Transmitter** from the M2 series, typically manufactured by **M-System**. These devices are used in industrial automation to convert signal inputs from temperature sensors into standardized analog signals for PLC or DCS systems. --- ### 1. Technical Specifications Breakdown The alphanumeric code describes the specific electronic hardware configuration of the module: | Component Code | Description | Specifications | | :--- | :--- | :--- | | **M2RTS** | Model Series | RTD Transmitter (Plug-in base) | | **R** | Input Signal | RTD (typically Pt 100 or JPt 100) | | **B2** | Output Signal | 4 – 20 mA DC (Current Loop) | | **R2** | Power Supply | 24V DC | --- ### 2. Key Electronic Features The M2RTS-R-B2-R2 functions as a signal conditioner with the following internal electronic characteristics: * **Three-Wire Compensation:** The electronic circuit is designed to compensate for lead-wire resistance in 3-wire RTD setups, ensuring the distance between the sensor and the transmitter does not affect accuracy. * **Galvanic Isolation:** This model features **3-way isolation** (Input to Output to Power). This protects the electronics from ground loops and high-voltage surges. * **Linearization:** The internal circuitry includes a linearization circuit that converts the non-linear resistance change of the platinum sensor into a linear 4-20mA current signal. * **Burnout Protection:** It includes a "Burnout" electronic feature. If the sensor wire breaks, the output will go to a predefined safety state (typically upscale ≥ 20.8 mA or downscale ≤ 3.8 mA). --- ### 3. Connection Diagram Overview | Terminal | Function | Description | | :--- | :--- | :--- | | **Input (1, 2, 3)** | RTD Connection | Connects to the Pt100 sensor (A, B, B' leads). | | **Output (4, 5)** | DC Output | 4 - 20 mA signal to the controller. | | **Power (7, 8)** | Supply | 24V DC Power source. | --- ### 4. Calibration and Adjustment The front of the module typically contains two electronic trimming potentiometers (trimmers): 1. **Zero Adjustment:** Used to calibrate the 4mA point. 2. **Span Adjustment:** Used to calibrate the 20mA point.