The **M2RTS-S-C1-R2** is a specific model of a **Resistance Thermometer (RTD) Transmitter** belonging to the M2 Series, manufactured by **M-System**. This device is designed to convert signals from an RTD sensor into a standard industrial DC signal. --- ## 1. Technical Specifications The alphanumeric code identifies the specific configuration of the electronic components inside the unit: | Part Segment | Specification | Description | | :--- | :--- | :--- | | **M2RTS** | Model Series | RTD Transmitter (Plug-in type) | | **-S** | Input Type | Pt 100 (ITS-90) | | **-C1** | Output Signal | 4 – 20 mA DC | | **-R2** | Power Input | 100 – 240V AC | --- ## 2. Key Electronic Components & Features ### A. Signal Conditioning Circuitry The device contains high-precision operational amplifiers and an A/D converter. It takes the low-level resistance change from a Pt100 sensor and linearizes it. * **Linearization:** It compensates for the non-linear relationship between temperature and resistance in platinum sensors. * **Burnout Protection:** The circuit includes a burnout feature that forces the output to a specific level (usually upscale) if the sensor wire breaks. ### B. Isolation Barrier This model features **three-way isolation**. This means the electronic paths for **Input**, **Output**, and **Power** are electrically separated. * **Benefit:** Prevents ground loops and protects the control system from high-voltage surges on the field side. * **Isolation Resistance:** Typically 100 MΩ or more with 500V DC. ### C. Power Supply Module The `-R2` suffix indicates a universal AC switching power supply. * **Input Range:** 85 – 264V AC. * **Frequency:** 47 – 66 Hz. * **Internal Protection:** Includes internal fuses and surge absorbers to handle line noise. ### D. Adjustments (Potentiometers) On the front panel, the device features two multi-turn trimmers: * **Zero Adjustment:** Sets the 4mA point. * **Span Adjustment:** Sets the 20mA point. --- ## 3. Connection Diagram (General) ```text Input (RTD) Transmitter Output (PLC/DCS) +-------+ +-----------+ +-----------+ | A |-----------| (1) (4) |----------| + (4-20mA)| | B |-----------| (2) (5) |----------| - | | B |-----------| (3) | +-----------+ +-------+ | (7) (8) |<--------- Power (AC) +-----------+ ``` --- ## 4. Operational Environment The electronics are housed in a flame-resistant black resin (ABS) casing. * **Mounting:** Designed for a 11-pin circular socket (plug-in base). * **Operating Temp:** -5 to +55°C (23 to 131°F).