The **M2RTS-R-A3-M2/N** is a specific model of a **Resistance Transmitter** (RTD Transmitter) belonging to the M2 series manufactured by **M-System**. This device is designed to convert signals from an RTD (Resistance Temperature Detector) into a standardized industrial DC signal. --- ## 1. Technical Specifications Breakdown The alphanumeric code represents specific hardware configurations. Below is the breakdown of the electronic parts and their functions: | Component Code | Description | Electronic Function | | :--- | :--- | :--- | | **M2RTS** | Model Name | Resistance Transmitter (RTD input). | | **-R** | Power Input | **AC Power:** 24V DC (Standard for internal rail logic). | | **-A3** | Input Type | **Pt 100 (JIS '97, IEC):** Standard platinum resistance sensor input. | | **-M2** | Output Type | **4 – 20 mA DC:** Converts temperature to a current loop signal. | | **-N** | Option | **None:** Standard housing/no special coating. | --- ## 2. Internal Electronic Architecture The device consists of several key stages to ensure signal integrity and accuracy: ### A. Input Stage (Signal Conditioning) * **Constant Current Source:** The transmitter sends a small, stable current through the RTD to measure voltage drop. * **Linearization Circuit:** Since RTD resistance is not perfectly linear with temperature, internal circuitry compensates for the curve of the Pt100 element. ### B. Isolation Barrier * **Three-Way Isolation:** This model typically features isolation between **Input – Output – Power**. * **Purpose:** Prevents ground loops and protects the control system (PLC/DCS) from high-voltage surges on the field side. ### C. Output Stage (Current Loop) * **Voltage-to-Current Converter:** Converts the processed temperature signal into a 4-20mA analog signal. * **Load Resistance Support:** Designed to drive loads up to 550 $\Omega$. --- ## 3. Physical & Installation Features * **Housing Material:** Flame-resistant resin (Black). * **Connection:** M3 screw terminals (Nickel-plated steel). * **Zero/Span Adjustment:** Front-facing potentiometers (Trimmers) allow for $\pm 5\%$ manual calibration adjustment. * **Mounting:** Standard DIN rail mounting. --- ## 4. Summary Table of Operations | Feature | Specification | | :--- | :--- | | **Accuracy** | $\pm 0.2\%$ of span | | **Response Time** | $\leq 0.5$ seconds (0 – 90%) | | **Isolation Resistance** | 100 M$\Omega$ or more at 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute |