The **M2RTS-R-CC-R2/Q** is a high-precision, plug-in type RTD (Resistance Temperature Detector) transmitter manufactured by **M-System**. It is designed to convert temperature signals from an RTD into a standard process signal (like 4-20mA DC or 0-10V DC). Below is the breakdown of its electronic components, specifications, and functions. --- ### 1. Model Code Breakdown | Segment | Meaning | Specification | | :--- | :--- | :--- | | **M2RTS** | Series Name | Mini-M Series RTD Transmitter | | **-R** | Input Type | RTD (Pt 100, JPt 100, etc.) | | **-CC** | Output Code | Dual Output (Current/Current or as specified) | | **-R2** | Power Input | 24V DC | | **-Q** | Special Option | Often indicates "Quality" or "Custom Specification" (e.g., specific coating) | --- ### 2. Key Electronic Components & Internal Functions The device operates using several critical stages to ensure signal integrity: * **A/D Converter (Front End):** Converts the analog resistance value from the RTD into a digital signal. It includes **Burnout Protection circuitry**, which forces the output to a specific level (high or low) if the sensor wire breaks. * **Linearization Circuitry:** RTD resistance change is not perfectly linear relative to temperature. This electronic stage applies a curve-correction algorithm to ensure the output is proportional to the actual temperature. * **Galvanic Isolation:** The "R2" configuration typically features 3-way isolation: * **Input to Output** * **Input to Power** * **Output to Power** * *Benefit:* Prevents ground loops and protects sensitive PLC/DCS inputs from high-voltage surges. * **Potentiometers (Zero/Span):** Located on the front panel, these allow for manual fine-tuning of the zero point (4mA) and the full-scale span (20mA). --- ### 3. Technical Specifications | Feature | Description | | :--- | :--- | | **Input Signal** | 3-wire RTD (standard 100Ω Platinum) | | **Input Resistance** | 1MΩ minimum | | **Excitation Current** | Approx. 0.2mA (to prevent self-heating of the RTD) | | **Output Signal** | 4 – 20 mA DC (for -CC configuration) | | **Accuracy** | ±0.1% of span | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Housing Material** | Flame-resistant resin (Black) | --- ### 4. Wiring Diagram Overview ```text Terminal | Function ------------------- 1 | Output 1 (+) 2 | Output 1 (-) 3 | Output 2 (+) 4 | Output 2 (-) 5 | RTD Input (A) 6 | RTD Input (B) 7 | RTD Input (B') 8 | Power (+) 24V DC 9 | Power (-) 0V ```