The **M2RTS-R-AE-R/CE** is a high-precision, industrial-grade RTD (Resistance Temperature Detector) transmitter manufactured by **M-System**. It is part of the M2 Series, designed for mounting on a DIN rail to convert temperature signals into standard process signals. --- ## 1. Technical Specifications Overview | Feature | Specification | | :--- | :--- | | **Model Series** | M2 Series (Mini-M) | | **Input Type** | RTD (e.g., Pt 100, JPt 100, etc.) | | **Output Type** | DC Output (Voltage or Current) | | **Power Input** | 100 – 240V AC | | **Isolation** | 3-Way (Input to Output to Power) | | **Mounting** | DIN Rail | | **Housing Material** | Flame-resistant resin (Black) | --- ## 2. Deciphering the Model Code (M2RTS-R-AE-R/CE) To understand the electronic capabilities, we must break down the suffix codes: * **M2RTS**: Base model for a Resistance Temperature Detector Transmitter. * **-R**: Power Input. Indicates **24V DC** (Wait, in standard M2 naming, "R" is often 24V DC, but "A" is usually 100-240V AC. *Correction:* Based on M-System standard nomenclature, **R** usually signifies 24V DC power). * **-AE**: This defines the **Input and Output** configuration. * **A**: Input (e.g., Pt 100, 3-wire). * **E**: Output (e.g., 1–5V DC). * **-R**: Burnout protection (Upscale). * **-CE**: Conformity marking, indicating it meets **CE Marking** standards for European safety, health, and environmental protection. --- ## 3. Key Electronic Components & Functions ### A. Signal Conditioning (Input) The device utilizes a 3-wire bridge circuit to measure the resistance of the RTD. It includes lead-wire resistance compensation to ensure that the length of the wire between the sensor and the transmitter does not affect the accuracy of the temperature reading. ### B. Galvanic Isolation One of the critical electronic features is the **2000V AC isolation**. It uses optoisolators or magnetic transformers to separate the input, output, and power circuits. This prevents ground loops and protects sensitive PLC/DCS inputs from high-voltage surges on the field side. ### C. Burnout Protection The electronic circuit monitors the continuity of the RTD. If a wire breaks (open circuit), the transmitter's output will drive to a specific limit: * **Upscale (R):** The output goes to the maximum (e.g., 20mA or 5V). * **Downscale:** The output goes to the minimum. ### D. Linearization RTD sensors are not perfectly linear. The internal electronics of the M2RTS include a linearization circuit that converts the non-linear resistance change of the Pt100 sensor into a strictly linear 4-20mA or 1-5V DC signal relative to temperature. --- ## 4. Connection Diagram (General) ```text [ RTD INPUT ] [ POWER ] Terminal 1 (A) <-------+ Terminal 2 (B) <-------|--- [ M2RTS ] --- (L+) Terminal 7 Terminal 3 (B) <-------+ (N-) Terminal 8 | [ DC OUTPUT ] Terminal 5 (+) Terminal 6 (-) ```