The **M2VT-CD-R2/Q** is a high-performance **Signal Conditioner** (Isolator/Converter) manufactured by **M-System**. It is part of the "Mini-M" series, designed for space-saving installations on DIN rails. Below is a detailed breakdown of its electronic specifications and characteristics. ### 1. Model Code Breakdown | Segment | Identifier | Description | | :--- | :--- | :--- | | **Series** | M2VT | V-Unit (Mini-M) series signal conditioner | | **Input** | C | 4 – 20 mA DC | | **Output** | D | 0 – 20 mA DC | | **Power** | R2 | 11 – 27 V DC | | **Option** | /Q | Custom specific or special requested specification | --- ### 2. Core Electronic Specifications The device acts as a buffer and isolator between an input sensor loop and a controller (PLC/DCS). | Parameter | Specification | | :--- | :--- | | **Input Impedance** | 250 $\Omega$ (standard for 4-20mA loops) | | **Output Load Resistance** | Max 600 $\Omega$ | | **Accuracy** | ±0.1% of span | | **Response Time** | $\leq$ 0.5 seconds (0 – 90%) | | **Isolation** | 3-way isolation (Input to Output to Power) | | **Isolation Resistance** | 100 M$\Omega$ at 500 V DC | | **Dielectric Strength** | 2000 V AC @ 1 minute | --- ### 3. Key Electronic Features * **3-Way Isolation:** This is the most critical electronic feature. It electrically separates the input signal, the output signal, and the power supply. This prevents **ground loops** and protects sensitive equipment from high-voltage surges on the field side. * **Zero and Span Adjustments:** Located on the front panel. These are precision potentiometers (trimmers) that allow for fine-tuning the calibration of the electronic circuit. * **Power Efficiency:** Designed for low power consumption (approx. 3W), minimizing heat generation within high-density electrical cabinets. * **LED Indicator:** A power LED indicates the status of the internal DC-to-DC converter circuit. --- ### 4. Circuit Connection Diagram (Simplified) To ensure the electronic part functions correctly, the wiring must follow this logic: ```text [FIELD SIDE] [CONDITIONER] [PLC SIDE] (4-20mA Loop) ----> [Terminal 4 (+)] [Terminal 1 (+)] ----> (0-20mA Input) <---- [Terminal 5 (-)] [Terminal 2 (-)] <---- (Common) [Terminal 7 (+)] <---- 24V DC Power [Terminal 8 (-)] ----> Power Ground ``` --- ### 5. The "/Q" Designation In M-System terminology, the **"/Q"** suffix indicates a "Quality" or "Special Specification" option. This usually means the unit comes with specific documentation or coatings, such as: 1. **Conformal Coating:** Protection against moisture and dust for the PCB. 2. **Calibration Certificate:** Included physical test reports. 3. **Special Tagging:** Custom identification plates.