The **M2RT-5A-R/K** is a high-performance, signal-conditioning plug-in module manufactured by **M-System**. It is specifically an **Electronic Potentiometer Transmitter**. Its primary function is to sense the position of a potentiometer (resistance) and convert that linear or rotational movement into a standard industrial DC signal. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Model Type** | Potentiometer Transmitter (Plug-in) | | **Input Signal** | Potentiometer (Total resistance 100 $\Omega$ to 10 k$\Omega$) | | **Output Signal (R)** | 4 – 20 mA DC (Load resistance 600 $\Omega$ max) | | **Power Input (K)** | 85 – 132 V AC | | **Accuracy** | ±0.1% | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Construction** | Plug-in base socket mount | --- ### 2. Functional Breakdown The device consists of several critical electronic stages to ensure signal integrity: * **Excitation Circuit:** Provides a constant, regulated voltage to the external potentiometer. * **Isolation Transformer:** The "M2" series features high-level isolation between the Input, Output, and Power circuits (2000V AC). * **Zero/Span Adjustment:** Located on the front panel, these allow the user to calibrate the 0% and 100% points of the resistance travel to the desired DC output. * **Signal Conditioner:** Converts the varying resistance ratio into a stabilized current or voltage loop. --- ### 3. Model Suffix Breakdown (5A-R/K) The alphanumeric code identifies the specific hardware configuration: * **5A:** Represents the standard input/output configuration for a Potentiometer to DC signal. * **R:** Indicates the Output type (typically **4 – 20 mA DC**). * **K:** Indicates the Power Supply requirement (**85 – 132 V AC**). --- ### 4. Typical Wiring Diagram (Simplified) ```text [ Potentiometer ] [ M2RT Unit ] [ Controller/PLC ] (High) Pin 1 ---------- Pin 1 (Input) (Wiper) Pin 2 ---------- Pin 2 (Input) -----> Output (+) Pin 4 (Low) Pin 3 ---------- Pin 3 (Input) -----> Output (-) Pin 5 -----> Power (L/N) Pins 7/8 ``` ---