The **M2RS-44-R2/N** is a specific model of an **Ultra-Slim Plug-in Signal Conditioner** (specifically a thermocouple transmitter) manufactured by **M-System**. It is designed to convert signals from a thermocouple into a standard industrial DC signal. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Model Series** | M2 (Ultra-slim, plug-in type) | | **Input Type** | Thermocouple (Configurable via internal DIP switches) | | **Output Type** | 4 – 20 mA DC (Standard current loop) | | **Power Input (R2)** | 110V AC (Standard range: 90 – 121V AC) | | **Safety/Standard (/N)** | No CE marking (Standard Japanese/General industrial spec) | --- ### 2. Breakdown of Model Nomenclature To understand the electronic capabilities, we look at the suffix codes: * **M2RS**: Indicates the series. "RS" specifically refers to a **Thermocouple Transmitter**. * **44**: * First '4': Input is a thermocouple (e.g., K, E, J, T, B, R, S, C). * Second '4': Output is 4 – 20 mA DC. * **R2**: Power Supply requirement. `R2` signifies **100 – 120V AC**. * **N**: Option code signifying no specific certification (unlike /CE or /UL). --- ### 3. Core Electronic Features #### A. Signal Conditioning & Isolation The device provides **three-way isolation** between the input, output, and power supply. This prevents ground loops and protects sensitive PLC/DCS equipment from high-voltage surges or noise on the sensor side. * **Isolation Resistance:** 100 MΩ or more with 500V DC. * **Dielectric Strength:** 2000V AC @ 1 minute. #### B. Burnout Protection The electronic circuit includes a "Burnout" feature. If the thermocouple wire breaks, the transmitter will force the output to a specific state (usually Upscale, >20mA) to alert the control system of a hardware failure. #### C. Cold Junction Compensation (CJC) Since thermocouples measure the difference in temperature between the "hot" tip and the "cold" junction at the transmitter terminals, the M2RS includes a high-precision thermistor at the input terminals to compensate for ambient temperature changes. #### D. Physical Architecture * **Plug-in Base:** The electronics are housed in a module that plugs into a base. This allows for replacement without disconnecting the wiring. * **Front Adjustments:** Contains Zero and Span adjustments (potentiometers) behind a front cover for field calibration. --- ### 4. Typical Connection Diagram ```text [ Thermocouple ] ----> [ Terminals 4(+) & 5(-) ] [ 110V AC Power ] ----> [ Terminals 7(L) & 8(N) ] [ 4-20mA Output ] ----> [ Terminals 1(+) & 2(-) ] ```