The **M2RTS-R-DA-R/UL** is a high-precision, industrial-grade RTD (Resistance Temperature Detector) transmitter. It belongs to the **M2 Series** produced by **M-System** (now part of MG CO., LTD). This specific model is designed to convert signals from a temperature sensor (RTD) into a standard DC output signal. --- ### 1. Model Breakdown The suffix/model code defines the specific electrical characteristics of the device: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **M2RTS** | Model Series | RTD Transmitter (Plug-in base) | | **-R** | Power Input | 24V DC | | **-DA** | Output Signal | 4 to 20 mA DC (Source) | | **-R** | Input Signal | Cu 10 @ 25°C (Copper RTD) | | **/UL** | Certification | UL/cUL Class I, Division 2 approval | --- ### 2. Key Electronic Components & Features #### A. Input Section (RTD Interface) * **Sensor Compatibility:** Designed specifically for **Copper 10 ohm** RTDs. * **3-Wire Compensation:** It uses a bridge circuit to compensate for lead-wire resistance, ensuring that the distance between the sensor and the transmitter does not affect accuracy. * **Burnout Protection:** Includes an electronic circuit that drives the output to a specific limit (usually >20mA or <4mA) if the sensor wire breaks. #### B. Signal Conditioning & Isolation * **Galvanic Isolation:** This unit features **three-way isolation** (Input to Output to Power). This prevents ground loops and protects sensitive PLC/DCS equipment from high-voltage surges on the field side. * **Linearization:** Since RTD resistance changes are not perfectly linear with temperature, the internal circuitry applies a linearization curve to ensure the 4-20mA output is proportional to the actual temperature. #### C. Output Section * **Current Loop:** Provides a 4-20 mA DC signal. * **Load Resistance:** Capable of driving loads up to 550 $\Omega$. --- ### 3. Technical Specifications | Parameter | Specification | | :--- | :--- | | **Supply Voltage** | 24V DC (±10%) | | **Current Consumption** | Approx. 50 mA | | **Isolation Resistance** | ≥ 100 M$\Omega$ at 500V DC | | **Dielectric Strength** | 2000V AC @ 1 minute | | **Accuracy** | ±0.2% of span | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | | **Mounting** | Surface or DIN rail (via socket) | --- ### 4. Terminal Connection Diagram (Typical) ```text [ Power Input ] [ Input (RTD) ] [ Output ] Term 7: +24V Term 1: A Term 4: + Term 8: 0V Term 2: B Term 5: - Term 3: B ``` ---