The **M2RTS-R-C3-M2/N** is a specific configuration of a high-performance **Signal Conditioner** (specifically a Resistance Temperature Detector or RTD transmitter) manufactured by **M-System**. This device is designed to convert signals from an RTD sensor into a standard industrial DC signal (like 4-20mA or 0-10V). --- ### 1. Model Code Breakdown Understanding the electronic capabilities of this unit requires deconstructing the model number: | Code Segment | Description | Technical Specification | | :--- | :--- | :--- | | **M2RTS** | Series Name | Mini-M Series RTD Transmitter | | **-R** | Power Input | 24V DC (Allowable range: 24V ±10%) | | **-C3** | Input Type | Cu 10 Ω @ 25°C (Copper RTD sensor) | | **-M2** | Output Type | 4 – 20 mA DC (Current output) | | **-N** | Option | No Special Options (Standard configuration) | --- ### 2. Key Electronic Components & Functions The internal circuitry of the M2RTS is divided into several functional stages: #### A. Input Circuit (Sensor Interface) * **Constant Current Source:** Since it interfaces with a Cu 10Ω RTD, the device sends a small, stable current through the sensor to measure resistance changes. * **Linearization Circuit:** RTD resistance change is not perfectly linear relative to temperature. This electronic stage corrects the curve to ensure the output is proportional to the temperature. * **Burnout Protection:** Includes a circuit to detect if a sensor wire is broken. If detected, the output will typically drive to a "High" (upscale) or "Low" (downscale) limit. #### B. Isolation Barrier * **Three-Way Isolation:** The electronic architecture provides 2000V AC isolation between the **Input**, **Output**, and **Power** terminals. This prevents ground loops and protects sensitive PLC/DCS hardware from electrical surges on the sensor side. #### C. Output Stage * **Current Driver:** Converts the processed signal into a precise 4-20mA DC loop. * **Zero/Span Adjustments:** Located on the front panel, these allow for electronic calibration to fine-tune the minimum (4mA) and maximum (20mA) points. --- ### 3. Electronic Specifications | Parameter | Specification | | :--- | :--- | | **Power Consumption** | Approx. 3W | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Isolation Resistance** | ≥ 100 MΩ with 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute | | **Load Resistance** | Max 550 Ω | --- ### 4. Terminal Configuration (Wiring) | Terminal | Function | | :--- | :--- | | **1 - 2** | Output (+) and (-) | | **3 - 4** | Power Supply (24V DC) | | **5 - 6 - 7** | RTD Input (A, B, B') |