The **M2RTS-R-A1G-R2/Q** is a high-precision, industrial-grade RTD (Resistance Temperature Detector) transmitter module, typically manufactured by **M-System**. It is designed to convert signals from an RTD sensor into a standard analog output (like 4-20mA or 0-10V) for PLC or DCS integration. --- ### 1. Key Technical Specifications The "M2RTS" series is known for its ultra-slim design and high isolation capabilities. Below are the primary technical parameters: | Feature | Specification | | :--- | :--- | | **Input Type** | RTD (Pt 100, Pt 50, JPt 100, Cu 10, etc.) | | **Output Type** | Current (4-20mA DC) or Voltage (0-10V, 1-5V DC) | | **Power Input** | 24V DC (approx. ±10%) | | **Isolation** | 3-way isolation (Input to Output to Power) | | **Mounting** | DIN Rail Mounting | | **Accuracy** | ±0.1% of span | --- ### 2. Breakdown of the Model Code The suffix parts of the model number define specific hardware configurations: * **M2RTS**: Series name (Ultra-slim RTD Transmitter). * **R**: Power Input (typically 24V DC). * **A**: Output Code (e.g., 4-20 mA DC). * **1**: Input Code (e.g., Pt 100 Ω). * **G**: Selection of specific temperature ranges or scales. * **R2**: Design revision or specific terminal block type (Screw terminals). * **Q**: Special option code (often indicates a custom factory setting or specific coating). --- ### 3. Electronic Architecture The internal circuitry of this module consists of four main stages: #### A. Input Conditioning (Front-end) * Uses a **Constant Current Source** to excite the RTD sensor. * Includes **Burnout Protection**: A circuit that detects if the sensor wire is broken and drives the output to a safe high/low limit. #### B. Isolation Barrier * Utilizes **Optical or Galvanic Isolation**. This prevents electrical noise or ground loops from the field sensor from damaging the sensitive control system (PLC/DCS). #### C. Signal Processing * **Linearization**: RTDs are slightly non-linear. The internal electronics use an Op-Amp or Microprocessor-based circuit to linearize the resistance curve into a proportional voltage/current. #### D. Output Stage * **Current Loop Driver**: A robust output stage that can drive loads up to 550Ω (for 4-20mA). --- ### 4. Wiring Diagram Concept To connect this electronic part, the following terminal logic is generally used: ```markdown [ Field Side ] [ Module ] [ Control Side ] RTD Sensor (3-wire) ----> [ Input ] [ Power ] <------- 24V DC Source [ Output ] ------> PLC Analog Input ``` ---