The **M2UDS-K1-R/N** is a specific model within the M2 Series of high-performance, compact digital panel meters manufactured by **M-System** (now often branded under **MG CO., LTD**). This device is primarily used for monitoring and displaying DC input signals in industrial automation. --- ### 1. Model Breakdown (Nomenclature) Understanding the alphanumeric code helps identify the electronic capabilities of this specific unit: | Code Segment | Description | Specific Detail | | :--- | :--- | :--- | | **M2UDS** | Model Series | Digital Panel Meter (DC Input) | | **K** | Input Type | DC Current (typically 4–20mA or specified mA) | | **1** | Display Color | Red (High-visibility LED) | | **R** | Power Input | 24V DC | | **N** | Standards | None (Standard configuration/No special approvals) | --- ### 2. Key Electronic Specifications The internal electronics are designed for precision measurement and industrial-grade isolation. * **Input Characteristics:** Generally handles DC current signals (e.g., 4 to 20 mA DC) with an input resistance of approximately $10 \Omega$ to $100 \Omega$ depending on the range. * **Display:** 4-digit red LED, 8mm height. It features a scaling function that converts the electronic mA input into engineering units (e.g., Pressure, Temperature, or Level). * **Isolation:** The device provides **3-way isolation** between: 1. Input Signal 2. Output (if applicable) 3. Power Supply * **Accuracy:** Typically within $\pm 0.1\%$ of the span. * **Power Consumption:** Approximately 0.7W at 24V DC. --- ### 3. Connection Terminals The electronic wiring is simplified through a plug-in base structure: | Terminal No. | Function | Description | | :--- | :--- | :--- | | **1** | Input (+) | Positive DC Signal Input | | **2** | Input (-) | Negative DC Signal Input | | **4** | NC | No Connection | | **7** | Power (U+) | +24V DC Supply | | **8** | Power (V-) | 0V / Negative Supply | --- ### 4. Technical Features * **Scaling Electronics:** Internal potentiometers (accessible via the front panel) allow for Zero and Span adjustments to calibrate the display relative to the electrical input. * **Protection:** The electronics are housed in a flame-resistant black resin (UL94V-0) case, providing basic protection against dust and electrical interference. * **Response Time:** Fast electronic response, usually $\leq 0.5$ seconds for a 0% to 100% change. ---