The **M2RTS-R-D4-R** is a specific model of an **RTD (Resistance Temperature Detector) Transmitter** manufactured by **M-System**. It is designed to convert temperature readings from an RTD sensor into a standard analog process signal. --- ## 1. Component Overview The device is a plug-in signal conditioner. It takes the resistance value from an RTD (like a Pt100) and transforms it into a DC voltage or current output that a PLC or DCS can read. ### Key Specifications | Feature | Specification | |:---|:---| | **Model** | M2RTS (RTD Transmitter) | | **Input** | RTD (typically Pt 100, JPt 100, etc.) | | **Output** | DC Output (specified by the "R" suffix) | | **Power Input** | 24V DC (specified by the "D4" code) | | **Mounting** | Plug-in socket (DIN rail or surface) | --- ## 2. Breakdown of the Model Number The suffix codes define the specific electronic characteristics of the unit: * **M2RTS**: Series name for the RTD Transmitter. * **-R**: Configuration for the input type (Standard RTD). * **-D4**: Power Supply Requirement. In this case, **24V DC**. * **-R**: Output Type. This typically denotes a specific **DC Voltage/Current range** (Check the specific datasheet for the exact R-code mapping, often representing 4–20mA or 1–5V depending on sub-ordering). --- ## 3. Electronic Internal Functions The M2RTS-R-D4-R consists of several internal stages: 1. **Input Circuit (Bridge & Excitation):** Provides a constant current to the RTD sensor to measure the resistance change caused by temperature. 2. **Linearization Circuit:** RTDs are not perfectly linear. This circuit corrects the curve to ensure the output is proportional to the temperature. 3. **Isolation (Optical/Transformer):** Provides 3-way isolation between **Input – Output – Power**. This prevents ground loops and protects the control system from high-voltage surges on the sensor side. 4. **Output Amplifier:** Scales the signal to the industrial standard (e.g., 4-20mA). --- ## 4. Connection Diagram (General) The unit typically uses a base socket with the following pin logic: | Terminal | Function | |:---:|:---| | **1-2-3** | RTD Input (3-wire compensation) | | **4-5** | DC Output (+) and (-) | | **7-8** | Power Supply (24V DC) | ---