The **M2RTS-R-CC-R/N** is a specific model of a **Compact Signal Conditioner (RTD Transmitter)** from the M2-Series by **M-System**. Its primary function is to convert signals from a Resistance Temperature Detector (RTD) into a standard DC output signal. ### 1. Model Code Breakdown The alphanumeric string defines the specific hardware configuration and input/output characteristics: | Code Segment | Description | Specification | | :--- | :--- | :--- | | **M2RTS** | Model Family | RTD Transmitter (M2-Series) | | **-R** | Power Input | 24V DC | | **-CC** | Input/Output | Input: Pt 100 / Output: 4 – 20 mA DC | | **-R** | Options | Standard (No specific specialty option) | | **-N** | Base Socket | Without DIN rail socket (or specific terminal config) | --- ### 2. Key Electronic Components & Specifications The device acts as a high-precision analog-to-digital-to-analog interface. Below are the core technical specifications: #### Input Section (RTD) * **Sensor Type:** Pt 100 (3-wire system). * **Excitation Current:** Typically 1.0 mA to prevent self-heating of the sensor. * **Allowable Leadwire Resistance:** Up to 20 $\Omega$ per line. #### Output Section (Current Loop) * **Signal:** 4 – 20 mA DC. * **Load Resistance:** 550 $\Omega$ maximum. * **Isolation:** 3-way isolation (Input to Output to Power). #### Performance Data * **Accuracy:** ±0.1% of span. * **Temperature Coefficient:** ±0.015% per °C. * **Response Time:** $\le$ 0.5 seconds (0 – 90%). --- ### 3. Circuit Features The internal electronics are designed for industrial reliability: 1. **Linearization Circuit:** RTDs are not perfectly linear. The internal circuitry applies a linearization curve to ensure the 4-20mA output represents the temperature accurately. 2. **Burnout Protection:** If the RTD wire breaks, the electronics are configured to drive the output to an "Upscale" (above 20mA) or "Downscale" (below 4mA) state to alert the PLC/DCS of a failure. 3. **Galvanic Isolation:** Uses optoisolators or transformers to prevent electrical noise or ground loops from traveling between the field sensor and the control room. --- ### 4. Wiring Diagram (Simplified) To integrate this part, the following terminal logic is typically applied: ```text Terminal | Function ---------|--------------------------- 1 & 2 | DC Power Input (24V) 4 & 5 | Output Signal (+) and (-) 9,10,11| RTD Input (A, B, B') ``` ---