The **M2XR2-3V2-R** is a specific model within the **M2 Series** of signal conditioners manufactured by **M-System** (now often branded as MG CO., LTD). These devices are high-performance plug-in signal conditioners designed to convert, isolate, and transmit analog signals in industrial automation. --- ### 1. Technical Specifications Table Below are the primary electronic characteristics of the M2XR2-3V2-R: | Parameter | Specification | | :--- | :--- | | **Model Type** | Potentiometer Transmitter | | **Input Signal** | Potentiometer (Total resistance 100 $\Omega$ to 10 k$\Omega$) | | **Output 1** | 1 to 5 V DC | | **Output 2** | 4 to 20 mA DC | | **Power Input** | 24 V DC | | **Accuracy** | $\pm$0.1% | | **Response Time** | $\leq$ 0.5 seconds (0 – 90%) | | **Isolation** | Input to Output 1 to Output 2 to Power | | **Mounting** | Surface or DIN rail | --- ### 2. Breakdown of the Model Number The alphanumeric code identifies the specific electronic configuration: * **M2XR2**: The series designation for a **Potentiometer Transmitter** (converts resistance changes into standard analog signals). * **3**: Indicates the **Power Input**. In this case, **24 V DC**. * **V2**: Indicates the **Output 1** signal type. "V2" typically denotes **1 – 5 V DC**. * **R**: Indicates the **Output 2** signal type. "R" typically denotes **4 – 20 mA DC**. --- ### 3. Key Electronic Features #### A. Isolation Technology This unit features **4-way isolation**. This means the Input, Output 1, Output 2, and Power supply are all electrically isolated from one another. This prevents ground loops and protects sensitive PLC/DCS equipment from high-voltage surges on the field side. #### B. Potentiometer Excitation The device provides a stabilized excitation voltage to the potentiometer. It measures the ratio of the wiper voltage relative to the total resistance, making the output independent of the potentiometer's absolute resistance value (as long as it is within the 100 $\Omega$ to 10 k$\Omega$ range). #### C. Calibration Adjustments The front panel typically includes: * **Zero Adjustment:** Used to set the output to 0% (e.g., 4mA) when the potentiometer is at its minimum position. * **Span Adjustment:** Used to set the output to 100% (e.g., 20mA) when the potentiometer is at its maximum position. --- ### 4. Typical Wiring Diagram (Simplified) ```text [ FIELD SIDE ] [ CONDITIONER ] [ CONTROL SIDE ] Potentiometer M2XR2-3V2-R PLC / Controller +----------+ +-----------+ +-------------+ | CW (1) |--------------->| Terminal 1| | Output 1 | | Wiper(2) |--------------->| Terminal 2| | (1-5V) | | CCW (3) |--------------->| Terminal 3| +-------------+ +----------+ | | | Output 2 | | Terminal 4| | (4-20mA) | +-----------+ +-------------+ | | [ 24V DC Power ] ```