The **M2RTS-S-4D-R** is a specific model of an **RTD (Resistance Temperature Detector) Transmitter** manufactured by **M-System**. It is part of the M2 series, known for its "plug-in" design and high reliability in industrial signal conditioning. --- ### 1. Key Technical Specifications Below is a breakdown of the electronic characteristics and capabilities of this specific model: | Feature | Specification Details | | :--- | :--- | | **Input Type** | RTD (Pt 100, JPt 100, etc.) | | **Output Type** | 4 to 20 mA DC (Direct Current) | | **Power Input** | 24V DC | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Accuracy** | ±0.1% of span | | **Isolation** | 3-way isolation (Input to Output to Power) | | **Construction** | Plug-in base socket mount | --- ### 2. Functional Components The "4D-R" suffix in the model name defines its specific electronic configuration: * **Input (S):** Standard RTD input. It typically supports 3-wire connections to compensate for lead-wire resistance. * **Output (4):** Represents a **4 to 20 mA DC** output signal, which is the industry standard for long-distance transmission with low noise interference. * **Power (D):** Indicates the device operates on **24V DC** power supply. * **Option (R):** Usually refers to the specific compliance or mounting orientation (Standard rack/base mounting). --- ### 3. Electronic Design Features #### A. Linearization Circuitry RTD elements do not have a perfectly linear resistance-to-temperature relationship. The M2RTS contains an internal microprocessor or analog linearization circuit that converts the non-linear resistance into a linear 4-20mA signal proportional to the temperature. #### B. 3-Way Isolation This is a critical electronic safety feature. The **Input**, **Output**, and **Power** circuits are electrically isolated from one another. This prevents: * **Ground Loops:** Noise caused by different ground potentials. * **Surge Propagation:** Protecting the PLC/DCS if a high-voltage surge hits the field sensor. #### C. Burnout Protection The device features "Upscale" or "Downscale" burnout protection. If the RTD wire breaks, the transmitter will force the output to a specific level (e.g., >20mA) to alert the control system of a hardware failure. --- ### 4. Wiring Diagram Concept | Terminal | Function | | :--- | :--- | | **1 - 3** | RTD Sensor Input (A, B, b) | | **4 - 5** | 4-20mA Output (+) and (-) | | **7 - 8** | 24V DC Power Supply | ---