The **M2RTS-S-DA-R/Q** is a specific high-precision RTD (Resistance Temperature Detector) transmitter from the **M2 Series** by **M-System**. It is designed to convert signals from a temperature sensor into a standardized DC output signal. --- ### 1. Key Technical Specifications Below are the primary electronic characteristics of this specific model: | Component/Feature | Specification | |:---|:---| | **Input Signal** | RTD (e.g., Pt 100, Pt 50, Ni 508.4) | | **Output Signal** | 4 to 20 mA DC | | **Power Input** | 24V DC (approx. ±10%) | | **Configuration** | PC programmable or DIP switch adjustable | | **Isolation** | 3-way isolation (Input – Output – Power) | | **Mounting** | DIN rail mounting | --- ### 2. Breakdown of the Model Suffixes The alphanumeric code provides specific details about the internal electronic configuration: * **M2RTS**: The base series (Ultra-slim Signal Conditioner / RTD Transmitter). * **-S**: This usually denotes the configuration type (System-integrated or Standard). * **-DA**: Refers to the output type; in this series, it typically signifies a current output (4–20 mA). * **-R**: Indicates the power supply requirement, specifically **24V DC**. * **-Q**: This is a "Special Option" suffix. It often implies that the unit has undergone specific quality inspections, tropicalization, or includes a test report. --- ### 3. Functional Electronic Modules Internally, the device consists of several critical stages: 1. **Input Conditioning Stage**: Provides a constant current excitation to the RTD sensor and measures the voltage drop. It includes lead-wire resistance compensation (3-wire system). 2. **A/D Converter**: Converts the analog millivolt signal from the RTD into a high-resolution digital signal. 3. **Microprocessor**: Linearizes the signal based on the specific RTD curve (DIN or JIS standards) and handles calibration data. 4. **Galvanic Isolation**: Uses optoisolators or transformers to decouple the input, output, and power circuits, preventing ground loops and protecting equipment. 5. **Output Stage (D/A)**: Converts the processed digital data back into a precise 4-20mA analog current loop. --- ### 4. Wiring Diagram (Simplified) ```text [ RTD SENSOR ] [ M2RTS UNIT ] [ RECEIVING INSTRUMENT ] (Terminal 1) <---------- (Input A) (Terminal 2) <---------- (Input B) (Output +) --------> (PLC/Controller) (Terminal 3) <---------- (Input b) (Output -) --------> (Common) (Power +) <--- 24V DC (Power -) <--- 0V ```