### M2RTS-R-4D-R/CE: Technical Breakdown The **M2RTS-R-4D-R/CE** is a high-precision, industrial-grade **RTD Transmitter** (Resistance Temperature Detector) manufactured by **M-System**. It is designed to convert signals from a temperature sensor (like a Pt100) into a standard DC output signal. --- ### 1. Model Code Breakdown Understanding the specific electronic configuration through its nomenclature: | Code Segment | Feature | Description | | :--- | :--- | :--- | | **M2RTS** | Series | M2 Series RTD Transmitter | | **-R** | Power Input | 24V DC | | **-4** | Input Signal | Pt 100 (ITS-90) | | **-D** | Output Signal | 0 – 20 mA DC | | **-R** | Options | Standard response time (approx. 0.5 sec) | | **-CE** | Certification | CE marking (European Conformity) | --- ### 2. Core Electronic Components The internal circuitry of this device consists of several critical stages: * **Input Stage (Signal Conditioning):** * Uses a 3-wire bridge circuit to compensate for lead wire resistance. * Excitation current is applied to the RTD to measure voltage drop. * **Isolation Barrier:** * Features **Three-way isolation** (Input to Output to Power). * Uses opto-isolators or magnetic transformers to prevent ground loops and protect equipment from high-voltage surges. * **Linearization Circuitry:** * RTDs have a slightly non-linear temperature-to-resistance relationship. This transmitter includes active circuitry to linearize the output relative to the temperature. * **Output Stage:** * A current driver that maintains the **0-20mA DC** signal across a specified load resistance (up to 750 $\Omega$). --- ### 3. Key Specifications | Specification | Value | | :--- | :--- | | **Input Resistance** | $\ge$ 1 M$\Omega$ (during power off) | | **Excitation Current** | 2 mA (standard) | | **Accuracy** | $\pm$0.1% of span | | **Temp. Coefficient** | $\pm$0.015% / °C | | **Isolation Resistance** | 100 M$\Omega$ at 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute | --- ### 4. Wiring and Installation The unit is typically a **plug-in style** module that mounts on a base or DIN rail. ```text Terminal Connections (Example): [1] Output (+) [2] Output (-) [3] RTD Input (A) [4] RTD Input (B) [5] RTD Input (B) - Sense [7] Power Input (+) 24V DC [8] Power Input (-) 0V ``` ---