The **M2RTS-S-DF-R2/N** is a high-performance **Resistance Temperature Detector (RTD) transmitter** manufactured by **M-System**. It is designed to convert signals from an RTD sensor into a standard DC output signal (such as 4-20mA or 0-10V). Below is the breakdown of its electronic specifications and features: ### 1. Model Code Breakdown | Segment | Meaning | Specification | | :--- | :--- | :--- | | **M2RTS** | Model Family | RTD Transmitter (Plug-in type) | | **-S** | Input Type | RTD (Pt 100, Pt 1000, etc.) | | **-DF** | Output Type | 2-channel Output (e.g., 4-20mA DC / 1-5V DC) | | **-R2** | Power Supply | 100 – 240V AC | | **-N** | Options | No specific option (Standard) | --- ### 2. Key Electronic Components & Functions This device utilizes several critical electronic subsystems to ensure precision measurement: * **A/D Converter:** Converts the analog resistance signal from the RTD into a digital value for processing. * **Microprocessor-based Linearization:** Unlike old analog transmitters, this unit uses digital lookup tables to linearize the non-linear resistance curves of RTDs (like Pt100). * **Galvanic Isolation:** The unit provides **3-port isolation** (Input to Output to Power). This prevents ground loops and protects sensitive PLC/DCS equipment from high-voltage surges. * **Burnout Protection:** An electronic circuit detects if a sensor wire is broken; if so, it forces the output to a pre-defined safety level (Upscale or Downscale). --- ### 3. Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Input Resistance** | 3-wire RTD (Cu 10, Pt 100, JPt 100, etc.) | | **Excitation Current** | 0.2 mA to 1.0 mA (depending on RTD) | | **Accuracy** | ±0.1% of span | | **Isolation Resistance** | 100 MΩ minimum at 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | --- ### 4. Typical Connection Diagram (Block Level) ```mermaid graph LR A[RTD Sensor] --> B[Input Terminals] B --> C[Signal Conditioner & Isolation] C --> D[Output 1: 4-20mA] C --> E[Output 2: 1-5V] F[100-240V AC Power] --> C ``` --- ### 5. Application Benefits 1. **High Density:** The plug-in base design allows for easy maintenance and replacement without disconnecting wires. 2. **Dual Output:** The `-DF` configuration allows you to send the temperature data to two different locations simultaneously (e.g., a local display and a remote PLC). 3. **Noise Rejection:** Superior filtering of 50/60Hz electromagnetic interference.