The **M2RTS-R-A3-R2/N** is a specific model of a **Resistance Transmitter** (RTD Converter) manufactured by **M-System**. It is a signal conditioner designed to convert the signal from a Resistance Temperature Detector (RTD) into a standard DC output signal. --- ## Technical Specifications The model code can be broken down into specific electronic characteristics based on the M-System nomenclature: | Component | Code | Description | | :--- | :---: | :--- | | **Model Series** | M2RTS | RTD Transmitter (Mini-M series) | | **Input Type** | R | RTD (e.g., Pt 100, JPt 100) | | **Output** | A | 4 – 20 mA DC (Current Loop) | | **Power Input** | 3 | 24V DC | | **Mounting** | R2 | Socket-mounted (standard base) | | **Option** | /N | Without specific CE/UL markings (Standard) | --- ## Key Electronic Features ### 1. Signal Conversion Logic The device acts as a bridge between a temperature sensor and a control system (like a PLC or DCS). It takes the variable resistance from an RTD sensor and linearizes it into a proportional current signal. ### 2. Isolation (3-Port Isolation) This unit features high-level electronic isolation between the **Input**, **Output**, and **Power supply**. * **Purpose:** Prevents ground loops and protects sensitive control equipment from electrical surges or noise on the sensor side. * **Isolation Strength:** Typically 2000V AC @ 1 minute. ### 3. Burnout Protection The electronic circuit includes a "burnout" feature. If the RTD sensor wire breaks, the transmitter will force the output to a specific state: * **Upscale Burnout:** Output goes to $\ge$ 20.8 mA. * **Downscale Burnout:** Output goes to $\le$ 3.8 mA. ### 4. Circuit Adjustments On the front or side of the module, there are electronic potentiometers (trimmers) for: * **Zero Adjustment:** To calibrate the 4mA floor. * **Span Adjustment:** To calibrate the 20mA ceiling. --- ## Wiring Configuration | Terminal No. | Function | Connection | | :--- | :--- | :--- | | **1 & 2** | Output (+) / (-) | 4-20mA to Receiver | | **4 & 5** | Power (+) / (-) | 24V DC Supply | | **6, 7 & 8** | RTD Input | 3-wire RTD connection (A, B, b) | --- ## Usage Precautions * **Load Resistance:** Ensure the output load resistance is within the allowable range (typically $\le 550 \Omega$ for 24V units). * **Environment:** These are analog electronic parts sensitive to high humidity and extreme temperatures; they should be mounted in an enclosure.