The **M2SP-1D-R/Q** is a specific model within the **M2 Series** of signal conditioners/transmitters manufactured by **M-System** (now part of MG CO., LTD). This specific device is a **Potentiometer Transmitter**, designed to convert a resistance change from a potentiometer (such as a position sensor) into a standard DC output signal. --- ## 1. Technical Specifications The alphanumeric code "M2SP-1D-R/Q" breaks down into specific hardware configurations: | Component Code | Specification Detail | Description | | :--- | :--- | :--- | | **M2SP** | Series Model | Potentiometer Transmitter (Plug-in base) | | **1** | Input Signal | Total resistance $100\ \Omega$ to $10\ \text{k}\Omega$ | | **D** | Output Signal | $0 - 20\ \text{mA}$ DC (Current output) | | **R** | Power Input | $24\ \text{V}$ DC | | **Q** | Options | Special marking or specific customization (usually coating) | --- ## 2. Internal Electronic Functionality The device operates using several key electronic stages to ensure accuracy and isolation: ### A. Input Stage (Potentiometer Interface) The device applies a constant reference voltage across the potentiometer. As the wiper moves, the resulting voltage ratio is captured. This stage is designed to handle a three-wire potentiometer connection. ### B. Signal Conditioning & Isolation * **Isolation:** This model features **Three-way Isolation**. The Input, Output, and Power circuits are electrically separated. This prevents ground loops and protects sensitive control equipment from surges. * **Zero/Span Adjustment:** On the front panel, there are multi-turn potentiometers used to calibrate the $0\%$ and $100\%$ points of the output signal relative to the sensor position. ### C. Output Stage The internal circuitry converts the processed voltage into a stable **$0-20\ \text{mA}$** current loop. Because it is an active output, it provides the driving voltage necessary for the loop (up to a specific load resistance, typically $750\ \Omega$). --- ## 3. Physical & Installation Features * **Construction:** It uses a plug-in socket structure, allowing the electronics to be replaced without disconnecting the field wiring. * **LED Indicator:** Typically includes a power indicator LED to signify the internal DC-DC converter is functioning. * **Wiring:** Uses M3.5 screw terminals on the base socket. --- ## 4. Typical Applications * **Valve Positioning:** Measuring the opening percentage of a motorized valve. * **Tank Level:** Using a float-arm connected to a potentiometer. * **Machine Displacement:** Tracking the linear or rotary motion of industrial machinery. ---