The **M2RTS-R-A3-R** is a specific model of an **RTD (Resistance Temperature Detector) Transmitter** manufactured by **M-System**. It is a plug-in type signal conditioner designed to convert a temperature signal from an RTD into a standardized DC output signal. --- ### 1. Key Technical Specifications The alphanumeric code provides specific details regarding the configuration of the internal electronics: | Component | Specification | Description | | :--- | :--- | :--- | | **Model** | M2RTS | RTD Transmitter (Plug-in type) | | **Retransmission** | -R | Standard response type | | **Input Type** | -A | Pt 100 (ITS-90) | | **Output Type** | -3 | 0 – 1 V DC (Voltage output) | | **Power Input** | -R | 24V DC | --- ### 2. Electronic Hardware Components The device consists of several critical internal stages to ensure accuracy and isolation: * **Input Stage (Linearization):** Since RTDs are slightly non-linear, the transmitter includes circuitry (typically an OP-AMP based feedback loop or a micro-controller) to linearize the temperature-to-resistance curve. * **Burnout Protection:** The "R" series typically includes a burnout protection circuit. If the RTD wire breaks, the electronics will drive the output to a specific "safety" level (either upscale or downscale). * **Isolation Transformer:** This model provides **3-port isolation**. It electronically separates the **Input**, **Output**, and **Power Supply** to prevent ground loops and protect against high-voltage surges. * **Zero/Span Adjustments:** On the front panel, there are two potentiometers (variable resistors) used to calibrate the low-end (Zero) and high-end (Span) of the signal range. --- ### 3. Wiring and Connection Interface The electronic interface is managed through an 8-pin base socket. ```text Pin Assignment (Example for M2 Series): [1] Output (+) [2] Output (-) [3] Power (+) [4] Power (-) [5] RTD Input (A) [6] RTD Input (B) [7] RTD Input (B') [8] Ground/N.C. ``` --- ### 4. Summary of Functions 1. **Conversion:** Converts $100\Omega$ (at $0^\circ C$) resistance changes into a $0-1V$ voltage signal. 2. **Noise Filtering:** Includes electronic low-pass filters to remove electromagnetic interference (EMI) often found in industrial environments. 3. **Leadwire Compensation:** Uses a 3-wire system to electronically cancel out the resistance of the wires leading to the sensor.