The **M2XU-S20-R** is a specific model within the **M2 series** of electronic signal transducers (transmitters) manufactured by **M-System** (now part of MG CO., LTD). This specific unit is a **Potentiometer Transmitter**, designed to convert resistance changes from a potentiometer into a standard analog signal. --- ### 1. Model Breakdown The model number identifies the specific hardware configuration: | Code Segment | Description | Specific Detail | | :--- | :--- | :--- | | **M2XU** | Base Series | Potentiometer Transmitter (Plug-in type) | | **S** | Input Range | Total resistance 100 $\Omega$ to 10 k$\Omega$ | | **20** | Output Type | 4 – 20 mA DC (Source) | | **R** | Power Input | 24V DC | --- ### 2. Electronic Component Functions The M2XU-S20-R consists of several internal electronic stages to ensure signal integrity: #### A. Input Circuit (Potentiometer Interface) The device applies a constant voltage across the external potentiometer. As the wiper moves, the voltage ratio changes. The transmitter is designed to handle a total resistance range of **100 $\Omega$ to 10 k$\Omega$**. #### B. Signal Conditioning & Isolation * **Isolation:** This unit provides **three-way isolation** between the input, output, and power supply. This is achieved using opto-couplers or transformers to prevent ground loops. * **Linearization:** The internal circuitry ensures that the output is linear relative to the resistance change. #### C. Output Driver The **"20"** designation indicates a current output. The electronics convert the processed signal into a regulated **4–20 mA** loop. * **Load Resistance:** Typically supports up to 550 $\Omega$. --- ### 3. Technical Specifications | Parameter | Specification | | :--- | :--- | | **Supply Voltage** | 24V DC (±10%, Ripple 10% p-p max) | | **Power Consumption** | Approx. 3W | | **Accuracy** | ±0.1% | | **Temp. Coefficient** | ±0.015% / °C | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Isolation Resistance** | ≥ 100 M$\Omega$ with 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute | --- ### 4. Application Hardware Setup The unit is a **plug-in type**, meaning the electronic module seats into a base socket (often the **M2B** base). 1. **Terminals 1, 2, 3:** Connect to the Potentiometer (High, Wiper, Low). 2. **Terminals 4, 5:** Current Output (4-20mA). 3. **Terminals 7, 8:** 24V DC Power Supply.