The part number **M2RTS-R-3B-R2/Q** refers to a high-precision, programmable transducer or signal conditioner, typically manufactured by companies like **M-System** (now part of MG CO., LTD). These devices are used in industrial automation to convert temperature or resistance signals into standardized analog outputs. --- ### 1. Part Number Breakdown Based on standard nomenclature for this series, the alphanumeric code represents specific configurations: | Segment | Meaning | Description | | :--- | :--- | :--- | | **M2RTS** | Model Series | Remote I/O or Signal Conditioner (Resistance/RTD Input) | | **R** | Power Input | Typically indicates 24V DC power supply | | **3B** | Input Type | Standardized code for **RTD (Resistance Temperature Detector)** | | **R2** | Output Type | Standardized code for **4–20 mA DC** current loop | | **Q** | Option | "Special Order" or "Option" (Specific coating or testing) | --- ### 2. Key Electronic Specifications The internal circuitry of this device is designed for high stability and isolation in harsh industrial environments. * **Input Stage:** Designed to interface with 3-wire or 4-wire RTDs (like Pt100). It uses a constant current excitation source to measure the resistance change. * **Isolation:** Features **3-way isolation** (Input to Output to Power). This prevents ground loops and protects sensitive PLC/DCS inputs from high-voltage surges. * **A/D and D/A Conversion:** The signal is digitized via an Analog-to-Digital converter for linearization and then converted back to a precise analog current (4-20mA) via a Digital-to-Analog converter. * **Response Time:** Typically $\leq 0.5$ seconds for a 0–90% step change. --- ### 3. Connection Diagram (General) The unit is usually a "Mini-M" plug-in type. Below is a representation of how the electronic pins are typically allocated: | Terminal | Function | Description | | :--- | :--- | :--- | | **1 & 2** | Power | + / - 24V DC Input | | **3 & 4** | Output | + / - 4–20mA Signal | | **5, 6, 7** | Input | RTD Connections (A, B, b) | --- ### 4. Application Use-Case This part is used when a temperature sensor (RTD) is located far from a control room. The **M2RTS** sits in a local junction box or cabinet, converts the sensitive resistance signal into a robust **4-20mA current loop**, which can travel long distances without being affected by electromagnetic interference (EMI). ---