The **M2RTS-R-CC-P** is a high-performance, compact signal conditioner (transmitter) from the M2 series by **M-System**. It is specifically designed to take a Resistance Temperature Detector (RTD) input and convert it into a standard DC output signal. Below is a breakdown of its electronic components, specifications, and architecture. --- ### 1. Component Identification (Model Suffix) | Suffix | Description | | :--- | :--- | | **M2RTS** | **Base Model:** RTD Transmitter (converts RTD to DC signal) | | **-R** | **Power Input:** 24V DC | | **-CC** | **Input/Output Type:** Pt 100 (ITS-90) input / 4–20 mA DC output | | **-P** | **Construction:** Plug-in base socket included | --- ### 2. Core Electronic Architecture The device operates using a specific signal chain to ensure precision and electrical safety: #### A. Input Section (RTD Interface) * **Sensor Support:** Typically configured for Pt 100 (platinum) sensors. * **Excitation Current:** The device sends a small, constant DC current (approx. 1mA) through the RTD to measure resistance without causing self-heating. * **3-Wire Compensation:** It includes circuitry to compensate for lead-wire resistance, ensuring that the length of the wire between the sensor and the module does not skew the temperature reading. #### B. Isolation Barrier * **Galvanic Isolation:** This is a "3-port" isolator. The **Input**, **Output**, and **Power** circuits are all electrically isolated from one another. * **Benefit:** This prevents ground loops, protects sensitive PLC/DCS inputs from high-voltage surges on the field side, and reduces noise interference. #### C. Signal Conditioning & Linearization * **Linearization Circuitry:** Since RTD resistance changes are not perfectly linear relative to temperature, the internal electronics apply a linearization curve to ensure the 4–20mA output is proportional to the actual temperature. * **Burnout Protection:** Includes an electronic "upscale" or "downscale" feature. If the RTD wire breaks, the output will automatically drive to a high or low limit to alert the control system of a fault. --- ### 3. Technical Specifications | Parameter | Specification | | :--- | :--- | | **Supply Voltage** | 24V DC (±10%) | | **Power Consumption** | Approx. 3W | | **Input Signal** | Pt 100 (3-wire) | | **Output Signal** | 4 – 20 mA DC (Load resistance max 550 $\Omega$) | | **Accuracy** | ±0.1% of span | | **Response Time** | $\leq$ 0.5 seconds (0 to 90%) | | **Isolation Resistance** | 100 M$\Omega$ at 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute (Input to Output to Power) | --- ### 4. Physical Layout & Terminals The unit uses a **plug-in socket** design, allowing the electronic module to be replaced without disconnecting the field wiring. 1. **Front Panel:** Contains Zero and Span adjustment potentiometers for fine-tuning the calibration. 2. **LED Indicator:** A power LED indicates the status of the 24V DC supply. 3. **Housing Material:** Flame-resistant black resin. ---