The **M2RT-1D-R2/CE** is a high-precision, plug-in signal transducer (specifically a Resistance Transmitter) manufactured by **M-System**. It is designed to measure resistance or RTD (Resistance Temperature Detector) signals and convert them into isolated standard DC output signals. --- ### 1. Key Technical Specifications The "R2" designation typically refers to the power input and versioning. Below are the core electronic characteristics: | Feature | Specification | | :--- | :--- | | **Input Type** | Resistance (0 – 100 $\Omega$ to 0 – 10 k$\Omega$) | | **Output Type** | DC Voltage or Current (e.g., 4–20mA, 0–10V) | | **Power Input** | 100 – 240V AC | | **Accuracy** | ±0.1% of span | | **Isolation** | 3-way isolation (Input to Output to Power) | | **Response Time** | $\leq$ 0.5 seconds (0 – 90%) | | **Mounting** | Plug-in base (Surface or DIN rail) | --- ### 2. Electronic Components & Internal Logic The device operates through a series of electronic stages to ensure signal integrity: 1. **Input Conditioning (Bridge Circuit):** The resistance input is typically integrated into a bridge circuit. A constant current is passed through the external resistance to detect the voltage drop. 2. **Isolation Barrier:** It uses **optical or transformer isolation**. This protects the control system (PLC/DCS) from high-voltage surges or ground loops present at the sensor side. 3. **Signal Conversion (D/A Conversion):** The internal circuitry linearizes the resistance input and converts it into a proportional DC signal via a Digital-to-Analog converter or precision Op-Amp stage. 4. **Zero/Span Adjustments:** Located on the front panel, these potentiometers allow for fine-tuning the calibration offsets. --- ### 3. Connection Diagram (Standard Pinout) The M2RT series uses a standard 8-pin or 11-pin base. The electronic terminals are generally assigned as follows: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1 & 2** | Power Input | L / N (100–240V AC) | | **4 & 5** | Output (+) / (-) | DC Signal to Controller | | **7 & 8** | Input (Resistance) | Connection to the Potentiometer/Sensor | --- ### 4. Certification & Environment * **CE Marking:** This indicates compliance with European safety, health, and environmental protection standards (specifically EMC and Low Voltage directives). * **Dielectric Strength:** Usually rated at 2000V AC @ 1 minute between all terminals. * **Operating Temp:** -5 to +55°C (23 to 131°F).