The **M2SES-1AC-R2/CE** is a high-precision, plug-in type signal conditioner (Isolator) manufactured by **M-System** (now MG CO., LTD). It is part of the M2 Series, designed to accept a DC input signal and provide an isolated DC output signal. ### 1. General Specifications | Feature | Description | | :--- | :--- | | **Model Series** | M2 Series (Mini-M) | | **Function** | Signal Isolator (Input/Output/Power Isolation) | | **Construction** | Plug-in base type | | **Mounting** | DIN rail or Surface mounting | | **Certification** | CE Marking (EMC Directive) | --- ### 2. Breakdown of the Model Number (Coding) The suffix segments explain the specific electronic configuration of this unit: * **M2SES**: The base model for a Signal Isolator. * **1**: Denotes the Input Signal type (Current Input, typically 4–20mA DC). * **A**: Denotes the Output Signal type (Current Output, typically 4–20mA DC). * **C**: Power Input specification (100V AC). * **R2**: Power Input specification (24V DC). *Note: Usually, the code following the power indicator clarifies the specific voltage range/type; "R" often signifies 24V DC in the M-System nomenclature.* * **CE**: Confirms the unit meets European Conformity standards for safety and electromagnetic interference. --- ### 3. Key Electronic Components & Internal Architecture The unit functions through three primary stages of electronic circuitry: #### A. Input Stage * **Shunt Resistor:** For current inputs (like 4-20mA), the unit uses a precision resistor to convert the current into a proportional voltage. * **Surge Absorbers:** Protects the internal circuits from high-voltage spikes on the input lines. #### B. Isolation Barrier (Galvanic Isolation) * **Optical or Transformer Isolation:** This is the "core" of the device. It electronically separates the input, output, and power supply. * **Benefit:** This prevents "ground loops" and protects expensive PLC/DCS equipment from field-side electrical faults. It provides isolation up to **2000V AC**. #### C. Output & Power Stage * **Operational Amplifiers (Op-Amps):** Used to scale and linearize the signal to the desired output range. * **DC-DC Converter:** Converts the input power (e.g., 24V DC) into the various internal voltages required to run the electronics while maintaining isolation. * **Adjustment Potentiometers:** Accessible on the front panel for **Zero** and **Span** calibration. --- ### 4. Technical Performance Data | Parameter | Specification | | :--- | :--- | | **Accuracy** | ±0.1% of span | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Insulation Resistance** | 100 MΩ with 500V DC | | **Isolation Strength** | 2000V AC @ 1 minute (Input to Output to Power to Ground) | | **Temperature Drift** | ±0.015% per °C | --- ### 5. Typical Application These parts are used in industrial automation to connect a sensor (like a flow meter) to a controller (PLC). If the sensor is in a "noisy" environment, the **M2SES** cleans the signal and ensures that an electrical failure at the sensor does not travel back to destroy the controller's input card.