The **M2UDS-4W0-R/N** is a specific model within the **M2UDS Series** of digital panel meters manufactured by **M-System**. These devices are designed to receive analog signals and convert them into a digital display for industrial monitoring. Below is a breakdown of the electronic specifications and technical parts of this model. --- ### 1. Model Code Breakdown The alphanumeric string defines the internal electronic configuration of the unit: | Component | Code | Description | | :--- | :--- | :--- | | **Series** | **M2UDS** | Digital Panel Meter (1/8 DIN size) | | **Input** | **4W** | 4 to 20 mA DC (Current input) | | **Display Color** | **0** | Red (Standard) | | **Output** | **R** | Relay Contact Output (Alarm) | | **Power Supply** | **N** | 100 – 240V AC | --- ### 2. Core Electronic Specifications These units are built using solid-state components designed for high accuracy and industrial durability. #### A. Input Section (4W) * **Input Signal:** 4 – 20 mA DC. * **Input Resistance:** Internal shunt resistor, typically around **10 Ω**. * **Sampling Rate:** Approximately 3 times per second (using a Dual-slope integration A/D converter). #### B. Display & Visuals * **Type:** 4-digit LED display. * **Character Height:** 10.1 mm (0.4"). * **Scaling:** The 4-20mA signal can be scaled electronically to show values from **-1999 to 9999**. #### C. Relay Outputs (R) * **Type:** Dual alarm outputs (High/Low). * **Relay Rating:** 250V AC @ 3A or 30V DC @ 3A (Resistive load). * **Function:** Triggered when the input signal exceeds or falls below user-defined setpoints. #### D. Power Supply (N) * **Voltage Range:** 85 to 264V AC (Universal AC). * **Isolation:** The electronics provide isolation between the Input, Output, and Power circuits to prevent ground loops. --- ### 3. Key Electronic Features * **Non-Volatile Memory:** Uses **EEPROM** to store scaling settings and alarm setpoints so that data is not lost during power outages. * **Galvanic Isolation:** High dielectric strength (typically 2000V AC) between power and input terminals. * **Excitation Supply:** Some versions provide a 24V DC output to power external 2-wire transmitters. --- ### 4. Technical Summary Table | Feature | Specification | | :--- | :--- | | **Accuracy** | ±0.1% of FS ±1 digit | | **Operating Temp** | -5 to +55°C | | **Housing Material** | Flame-resistant resin (Black) | | **A/D Conversion** | Dual-slope integration | | **Terminal Screws** | M3 Chrome-plated steel |