The **M2VT-163-R/N** is a specific model of an **Electronic Temperature Transmitter** (V-unit series) manufactured by **M-System**. It is designed to convert signals from a thermocouple or a DC millivolt source into a standard industrial DC output signal. Below is a breakdown of its technical specifications and electronic characteristics. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Model Series** | M2VT (V-Unit Series) | | **Input Type** | Thermocouple (Type K, E, J, T, B, R, S, C) or mV | | **Output Type** | 4 – 20 mA DC (Current) or 1 – 5 V DC (Voltage) | | **Power Input (R)** | 24 V DC | | **Power Input (N)** | 100 – 240 V AC | | **Accuracy** | ±0.1% of span | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Isolation** | 3-way isolation (Input to Output to Power) | --- ### 2. Functional Electronic Components The device operates using several internal stages to ensure signal integrity and accuracy: #### A. Input Section (Signal Conditioning) * **Cold Junction Compensation (CJC):** Since thermocouples measure the temperature difference between the hot junction and the terminals, an internal sensor measures the terminal temperature to compensate for errors. * **Burnout Protection:** The circuit includes a high-impedance monitoring path. If the thermocouple wire breaks, the transmitter forces the output to a specific "upscale" or "downscale" safety limit. #### B. Isolation Barrier * The **M2VT** features **2000V AC isolation**. This is achieved using optoisolators or magnetic transformers. This prevents ground loops and protects sensitive PLC/DCS equipment from high-voltage surges on the field side. #### C. Output Section * **Linearization:** Thermocouple signals are inherently non-linear. The internal microprocessor applies a linearization algorithm to ensure the 4-20mA output is perfectly proportional to the actual temperature, not just the raw millivolts. * **Zero/Span Adjustments:** Accessible potentiometers on the front allow for fine-tuning the electronic calibration. --- ### 3. Connection Diagram (Simplified) ```text Field Side (Input) Transmitter (M2VT) Control Side (Output) [ Thermocouple ] --------> [ Terminal 4(+) ] [ Terminal 1(+) ] ----> PLC [ Terminal 5(-) ] [ Terminal 2(-) ] ----> Ground | [ Power Supply ] [ Term 7 & 8 ] ``` --- ### 4. Part Number Suffix Breakdown * **-R:** Indicates the power requirement is **24V DC**. * **-N:** Indicates the power requirement is a wide range **100V to 240V AC**.