The **M2RTS-R-CD-R2/N** is a specific model within the **M2 Series** of signal conditioners manufactured by **M-System** (now part of MG CO., LTD). This device is a compact, plug-in **RTD (Resistance Temperature Detector) Transmitter**. It is designed to take a signal from an RTD sensor and convert it into a standardized DC output signal (such as 4-20mA or 0-10V) for use in PLCs, DCS systems, or controllers. --- ### 1. Model Code Breakdown The alphanumeric string defines the specific internal electronic configuration and capabilities: | Code Segment | Meaning | Specifics for this Model | | :--- | :--- | :--- | | **M2RTS** | Model Name | RTD Transmitter (M2 Series) | | **-R** | Power Input | 24V DC | | **-CD** | Input Type | Pt 100 (ITS-90) | | **-R2** | Output Type | 4 – 20 mA DC | | **-N** | Options | No specific option (Standard version) | --- ### 2. Key Technical Specifications The electronics are housed in a compact, plug-in base designed for DIN-rail mounting. * **Accuracy:** Typically $\pm$0.1% of span. * **Response Time:** $\leq$ 0.5 seconds (0 – 90%). * **Burnout Protection:** Standard (Upscale burnout). If the sensor wire breaks, the output goes to the maximum limit to alert the system. * **Isolation:** 3-way isolation (Input to Output to Power). This prevents ground loops and protects sensitive PLC equipment from electrical surges. * **Temperature Coefficient:** $\pm$0.015% per °C. --- ### 3. Connection and Wiring The device uses a base socket (typically included) for easy replacement without disconnecting wires. | Terminal | Function | Description | | :--- | :--- | :--- | | **1 & 2** | Output (+) / (-) | The 4-20mA DC signal sent to the controller. | | **3 & 4** | Power Input | 24V DC supply (+ and -). | | **5, 6 & 7** | RTD Input | Terminals for 3-wire Pt 100 sensors. | --- ### 4. Electronic Adjustment On the front of the unit, there are usually two small potentiometers (Trimmers) hidden under a cover: 1. **ZERO:** Used to adjust the 4mA (lower limit) point. 2. **SPAN:** Used to adjust the 20mA (upper limit) point. ---