The **M2AC-AZ1-R** is a specific electronic component within the **M2 series** of signal conditioners manufactured by **M-System (now MG CO., LTD.)**. This device is a **Potentiometer Transmitter**, designed to detect a resistor's position (like a slide wire) and convert it into a standard instrumentation signal. --- ### 1. Technical Specifications The model number breaks down into specific electronic characteristics: | Code Segment | Description | Detail | | :--- | :--- | :--- | | **M2AC** | Model Series | Potentiometer Transmitter (Plug-in base) | | **A** | Input | Total resistance 100 $\Omega$ to 10 k$\Omega$ | | **Z1** | Output | 4 – 20 mA DC (Load resistance 750 $\Omega$ max) | | **R** | Power Input | 24V DC | ### 2. Key Electronic Components & Functions Inside the M2AC-AZ1-R, several circuit blocks work together to ensure signal integrity: * **Reference Voltage Circuit:** Provides a stable, low-noise voltage across the external potentiometer to ensure linear tracking of the wiper position. * **Signal Conditioning Amp:** A high-impedance operational amplifier (Op-Amp) circuit that reads the wiper voltage without loading the sensor. * **Zero/Span Adjustments:** Multiturn potentiometers located on the front panel allow for electronic calibration of the 0% and 100% points. * **Isolation Barrier:** Uses an optoisolator or transformer to provide **2000V AC isolation** between the input, output, and power supply. This prevents ground loops and protects sensitive PLC/DCS inputs. * **V/I Converter:** Converts the processed voltage signal into a regulated 4-20mA current loop. ### 3. Electrical Connections The unit typically uses a **10-pin base** for installation. | Pin No. | Function | Connection Type | | :--- | :--- | :--- | | **1** | Output (+) | 4-20mA Signal | | **2** | Output (-) | Signal Ground | | **4** | Input (CW) | Potentiometer High | | **5** | Input (Wiper) | Potentiometer Center | | **6** | Input (CCW) | Potentiometer Low | | **9** | Power (U) | 24V DC (+) | | **10** | Power (V) | 24V DC (-) | --- ### 4. Application Summary This part is primarily used in industrial automation for: * **Valve Positioning:** Converting the physical position of a valve actuator into a 4-20mA feedback signal. * **Tank Level:** Using a float-operated slide wire to transmit fluid levels. * **Machine Motion:** Tracking the linear or rotary displacement of heavy machinery.