The **M2AC-AZE-R/CE** is a high-performance, compact AC signal conditioner (transducer) manufactured by **M-System** (now MG CO., LTD.). It belongs to the M2 series and is designed to convert an alternating current (AC) input into a standard DC output signal. --- ## 1. Technical Specifications Below are the primary electronic characteristics of the M2AC-AZE-R/CE: | Component | Specification | | :--- | :--- | | **Model Series** | M2 Series (Plug-in Signal Conditioners) | | **Input Signal** | 0 – 1 A AC or 0 – 5 A AC (Selectable) | | **Output Signal** | 4 – 20 mA DC (Current Output) | | **Power Supply** | 24V DC (Operational range: 24V ±10%) | | **Accuracy** | ±0.3% of span | | **Response Time** | $\leq$ 0.5 seconds (0 – 90%) | | **Isolation** | 3-way isolation (Input to Output to Power) | | **Dielectric Strength** | 2000V AC @ 1 minute | --- ## 2. Key Electronic Features ### A. RMS Sensing Unlike basic rectifiers that average the signal, this device uses **RMS (Root Mean Square)** sensing. This allows the electronic circuitry to accurately measure distorted waveforms or non-sinusoidal currents, which is critical in environments with high electrical noise or Variable Frequency Drives (VFDs). ### B. Three-Way Isolation The internal electronics are designed to provide complete galvanic isolation between: 1. **The Input:** High voltage/current AC side. 2. **The Output:** Low voltage DC control loop (PLC/DCS). 3. **The Power:** 24V DC supply. This prevents ground loops and protects sensitive control equipment from electrical surges. ### C. Zero and Span Adjustments The front panel contains multi-turn potentiometers. These allow for fine-tuning the electronics to ensure that a 0A input results in exactly 4mA and a maximum input results in exactly 20mA. --- ## 3. Circuit Block Diagram (Internal) The electronic processing follows this general path: 1. **Input Transformer:** Steps down the high AC current to a millivolt signal. 2. **RMS Converter IC:** Converts the AC waveform into a proportional DC voltage. 3. **Isolation Barrier:** Uses an opto-isolator or transformer to pass the signal to the output stage. 4. **Output Amplifier:** Converts the DC voltage into a regulated 4-20mA current loop. --- ## 4. Part Number Breakdown (M2AC-AZE-R/CE) * **M2AC:** Model type (AC Current Transmitter). * **A:** Input Type (AC Current). * **Z:** Input Range (Specific code for 1A/5A). * **E:** Output Type (4-20mA DC). * **R:** Power Input (24V DC). * **CE:** Conformity mark (European Safety Standards).