The **M2RS-CA-R** is a specific model of a **Plug-in Temperature Transmitter** (Thermocouple Transmitter) manufactured by **M-System**. It is designed to convert input from a thermocouple into a standard DC output signal. --- ### ## Technical Specifications Breakdown The alphanumeric code `M2RS-CA-R` defines the specific electronic hardware configuration of the unit: | Code Segment | Description | Specification | | :--- | :--- | :--- | | **M2RS** | Series Model | Mini-M Series Plug-in Signal Conditioner | | **CA** | Input Type | Type K Thermocouple (Chromel/Alumel) | | **R** | Power Input | 24V DC | --- ### ### Core Electronic Components & Features 1. **Input Section (Thermocouple Interface):** * **Cold Junction Compensation (CJC):** Includes an internal sensor to measure the terminal temperature, allowing the unit to compensate for the voltage generated at the connection point. * **Burnout Protection:** The circuit is designed to drive the output to a specific limit (usually upscale) if the thermocouple wire breaks. 2. **Signal Conditioning Circuitry:** * **Linearization:** Since thermocouple millivolt signals are non-linear, the internal electronics linearize the signal relative to temperature. * **Isolation:** The unit features **3-way isolation** (Input to Output to Power). This prevents ground loops and protects sensitive PLC/DCS inputs from high-voltage surges on the field side. 3. **Output Stage:** * The "Standard" configuration for this series usually provides a **4–20 mA DC** or **1–5 V DC** output (depending on the secondary factory settings), which is proportional to the temperature range calibrated. 4. **Physical Interface:** * **Plug-in Base:** The electronic module plugs into a base socket (typically a 10-pin or 11-pin base), allowing for easy replacement without disconnecting field wiring. * **Zero/Span Adjustments:** Front-facing potentiometers allow for fine-tuning the calibration of the lower (0%) and upper (100%) limits. --- ### ### Summary of Operation | Feature | Detail | | :--- | :--- | | **Isolation Resistance** | 100 MΩ or more with 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Accuracy** | Approximately ±0.1% of span | ---