The **M2RTS-R-B2-M2/CE** is a high-precision, industrial-grade **Temperature Transmitter** (Signal Conditioner) typically manufactured by companies like **M-System**. It is designed to convert signals from a Resistance Temperature Detector (RTD) into a standard analog output. --- ### 1. Model Breakdown (Nomenclature) The alphanumeric code represents specific hardware configurations: | Component | Code | Description | | :--- | :--- | :--- | | **Series** | **M2RTS** | RTD Transmitter (Mini-M Series) | | **Input** | **R** | RTD (Resistance Temperature Detector) | | **Output** | **B** | 2 – 10V DC (Standard Voltage Output) | | **Power Supply** | **2** | 100 – 240V AC | | **Standard** | **M2** | Standard mounting/connection type | | **Certification** | **CE** | European Conformity (Safety and EMC) | --- ### 2. Key Electronic Components & Functions The device functions through a series of internal electronic stages: #### A. Input Stage (Signal Conditioning) * **Sensor Interface:** Designed for 3-wire RTDs (like Pt100). It includes a constant current source to excite the RTD. * **Leadwire Compensation:** Uses a bridge circuit to cancel out the resistance of the wires leading to the sensor, ensuring only the temperature at the tip is measured. #### B. Isolation Stage * **Galvanic Isolation:** This unit features **three-way isolation** (Input to Output to Power). * **Components:** This is achieved using optoisolators or transformer-based coupling to prevent ground loops and protect sensitive PLC/DCS equipment from high-voltage surges. #### C. Conversion Stage (Processing) * **Linearization:** Since RTD resistance changes are not perfectly linear with temperature, the internal circuitry applies a linearization algorithm to ensure the 2-10V output is proportional to the temperature scale. * **Zero/Span Adjustments:** Accessible potentiometers on the front panel allow for fine-tuning the electronic calibration without specialized software. --- ### 3. Technical Specifications | Feature | Specification | | :--- | :--- | | **Input Type** | Pt 100 (ITS-90), JPt 100, etc. | | **Output Signal** | 2 to 10 V DC (Load resistance $\ge$ 4000 $\Omega$) | | **Accuracy** | $\pm$0.1% of span | | **Isolation Resistance** | 100 M$\Omega$ at 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute (Input to Output to Power) | | **Response Time** | $\le$ 0.5 seconds (0 – 90%) | --- ### 4. Installation and Wiring The device uses a **base socket** system for easy maintenance (plug-and-play). 1. **Terminals 1-3:** RTD Input (A, B, b). 2. **Terminals 4-5:** Analog Output (2-10V DC). 3. **Terminals 7-8:** Power Supply (100-240V AC). ---