The **M2VT-A3-R/CE** is a high-performance **Thin-Type Signal Conditioner (Isolator)** manufactured by **M-System** (now part of MG CO., LTD). It is designed to convert an input signal into a standard process signal while providing galvanic isolation between the input, output, and power supply. --- ### 1. Key Technical Specifications | Feature | Description | | :--- | :--- | | **Model Type** | M2VT (Thin-type Signal Conditioner) | | **Input Signal** | 4 – 20 mA DC | | **Output Signal (A3)** | 1 – 5 V DC | | **Power Input (R)** | 24 V DC | | **Standards (CE)** | CE Marking compliant (EMC and Low Voltage Directives) | | **Isolation** | 3-way isolation (Input to Output to Power) | | **Mounting** | DIN Rail Mounting | --- ### 2. Breakdown of the Part Number The suffix codes define the specific electronic characteristics: * **M2VT**: The series name (Ultra-slim, plug-in signal conditioner). * **A3**: Represents the specific Output range (1 to 5 Volts DC). * **R**: Indicates the Power Supply requirement (24 Volts DC). * **CE**: Confirms the unit meets European safety and electromagnetic compatibility standards. --- ### 3. Electronic Architecture & Components The device acts as an interface between field sensors and control systems (PLC/DCS). #### A. Input Circuit (4-20mA) The input stage consists of a precision shunt resistor. As the current (4-20mA) passes through, it creates a proportional voltage drop which is then processed by the internal circuitry. #### B. Isolation Barrier This is a critical electronic component. It uses **Optical or Transformer isolation** to physically separate the input and output circuits. * **Purpose:** Prevents ground loops and protects sensitive PLC equipment from high-voltage surges or electrical noise on the field side. * **Isolation Resistance:** Typically 100 MΩ or more with 500 V DC. #### C. Signal Conditioning & Output The internal operational amplifiers (Op-Amps) scale and linearize the signal. The "A3" configuration ensures that even if the input is current-based, the output provided to the controller is a stable 1-5V voltage signal. #### D. Performance Parameters * **Accuracy:** Typically ±0.1% of span. * **Response Time:** Approximately 0.5 seconds (0 to 90%). * **Temperature Coefficient:** ±0.015% per °C (ensures stability in industrial environments). --- ### 4. Wiring Diagram Overview | Terminal No. | Function | Connection | | :--- | :--- | :--- | | **1 & 2** | Output (+) / (-) | To PLC/DCS Analog Input (1-5V) | | **3 & 4** | Input (+) / (-) | From Sensor/Transmitter (4-20mA) | | **5 & 6** | Power (+) / (-) | 24V DC Supply |