The **M3LR-R4/A/Q** is a high-performance, ultra-slim signal conditioner (transducer) manufactured by **M-System**. It is specifically designed to accept a potentiometer (resistance) input and convert it into a standardized isolated DC output. Below is a breakdown of its electronic specifications and the meaning of its model suffix. ### 1. Model Configuration Breakdown The suffix codes identify the specific hardware configuration of the device: | Code | Component Segment | Description | | :--- | :--- | :--- | | **M3LR** | **Series Name** | Ultra-slim Potentiometer Transmitter | | **R4** | **Power Input** | 10 – 32V DC (Low voltage DC operation) | | **A** | **Output Signal** | 4 – 20 mA DC (Current output) | | **Q** | **Option** | Includes specific options (often refers to specific coating or certifications) | --- ### 2. Electronic Specifications The internal circuitry is designed for precision signal processing and galvanic isolation. #### Input Side (Potentiometer) * **Resistance Range:** Typically accepts total resistances from $100\,\Omega$ to $10\,k\Omega$. * **Excitation Voltage:** Approx. $0.5\text{V DC}$. * **Measuring Method:** 3-wire system to compensate for wire resistance. #### Output Side (Analog) * **Signal:** 4 to 20 mA DC. * **Load Resistance:** Up to $600\,\Omega$. * **Response Time:** $\leq 0.5$ seconds (0 to 90%). #### Technical Performance | Feature | Specification | | :--- | :--- | | **Accuracy** | $\pm 0.1\%$ of span | | **Isolation** | 3-way isolation (Input to Output to Power) | | **Dielectric Strength** | $2000\text{V AC}$ per minute | | **Temperature Coefficient** | $\pm 0.015\%$ per $^\circ\text{C}$ | --- ### 3. Key Electronic Features * **Microprocessor-Based Design:** Unlike older analog-only transmitters, the M3LR uses digital processing to ensure high linearity and easy calibration via front-panel buttons. * **Galvanic Isolation:** The device uses opto-isolators or transformers to separate the input, output, and power circuits. This prevents ground loops and protects sensitive PLC/DCS inputs from high-voltage surges. * **Status Indicator:** Equipped with a front LED that changes color or blinks to indicate power status or internal errors (sensor burnout, etc.). * **DIN Rail Mounting:** The housing is ultra-slim (approx. 5.9mm wide), designed for high-density electronic cabinet installations. --- ### 4. Typical Connection Diagram ```text [Potentiometer] [M3LR-R4/A/Q] [Receiver/PLC] (1) CW -----------| |--- (+) (4-20mA) (2) Wiper ---------| [ Isolation ] |--- (-) (Common) (3) CCW -----------| | | [Power] | |--- (+) 24V DC | |--- (-) 0V | ```