The **M2RTS-R-A1D-R/Q** is a high-precision, industrial-grade **Resistance Transmitter** (RTD Signal Conditioner) manufactured by **M-System**. It is designed to convert resistance signals from an RTD (Resistance Temperature Detector) into a standard DC output signal. ### 1. Component Identification The model number can be broken down into specific electronic configurations: | Code Segment | Description | Specific Detail | | :--- | :--- | :--- | | **M2RTS** | Model Series | RTD Transmitter (Mini-M Series) | | **-R** | Input Type | RTD (e.g., Pt 100, JPt 100) | | **-A** | Output Signal | 4 – 20 mA DC | | **1** | Power Input | 24V DC | | **-D** | RTD Type | Pt 100 (ITS-90) | | **-R** | Options | Standard response (approx. 0.5s) | | **-Q** | Special Option | Standards/Quality certification (e.g., CE/UL or specific coating) | --- ### 2. Key Electronic Specifications The internal circuitry of this module performs three primary functions: **Excitation**, **Linearization**, and **Isolation**. * **Input Section:** Provides a constant current excitation to the RTD sensor. It is designed to handle 3-wire connections to compensate for lead wire resistance. * **Isolation System:** Features **3-way isolation** (Input to Output to Power). This prevents ground loops and protects sensitive PLC/DCS inputs from high-voltage surges. * **Burnout Protection:** Includes an upscale burnout feature (default); if the RTD sensor wire breaks, the output goes to a maximum (approx. 25mA) to signal a fault. --- ### 3. Technical Parameters | Parameter | Specification | | :--- | :--- | | **Supply Voltage** | 24V DC (±10%) | | **Accuracy** | ±0.1% of span | | **Input Resistance** | ≥ 1 MΩ | | **Output Load Resistance** | 0 – 550 Ω | | **Isolation Resistance** | 100 MΩ with 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute (Input to Output to Power to Ground) | --- ### 4. Wiring Diagram Concept The unit typically uses a plug-in socket base for easy maintenance. ```text Terminal | Function ---------|--------------------------- 1 & 2 | Output (+) & (-) 4 & 5 | Power Supply (+) & (-) 9 | RTD Terminal A 10 | RTD Terminal B 11 | RTD Terminal C (Compensation) ``` ---