The **M2RTS-R-34-R2/CE** is a high-precision, industrial-grade RTD (Resistance Temperature Detector) transmitter from the M2 Series by **M-System**. It is designed to convert signals from a temperature sensor into a standard industrial DC output. --- ## 1. Core Technical Specifications The following table breaks down the electronic characteristics of this specific model: | Component / Feature | Specification Details | | :--- | :--- | | **Model Series** | M2RTS (RTD Transmitter) | | **Input Type** | Pt 100 (ITS-90) RTD sensor | | **Power Input (R)** | 24V DC | | **Output Type (34)** | 0 – 10V DC (Current drive ≥ 1mA) | | **Mounting (R2)** | Plug-in base (Standard M-System 11-pin) | | **Certification (CE)** | European Conformity (EMC & Low Voltage Directive) | | **Accuracy** | ±0.1% of span | | **Response Time** | ≤ 0.5 seconds (0 – 90%) | --- ## 2. Detailed Electronic Architecture ### A. Input Section (RTD Interface) The device is designed for **3-wire Pt 100** sensors. - **Lead Wire Resistance Compensation:** The electronic circuit compensates for the resistance of the lead wires (up to 20 $\Omega$ per wire) to ensure the temperature reading is not skewed by the distance between the sensor and the transmitter. - **Excitation Current:** It applies a very small, stable current to the RTD to prevent "self-heating," which would otherwise cause measurement errors. ### B. Signal Conditioning & Isolation - **Galvanic Isolation:** This model 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:** RTD signals are inherently non-linear. The internal circuitry provides linear output proportional to the temperature, not just the resistance. ### C. Output Section The "34" designation indicates a **0 – 10V DC** voltage output. - **Short-circuit Protection:** The output electronics are designed to withstand brief short circuits without permanent damage. - **Zero/Span Adjustments:** Accessible from the front panel, these allow for electronic calibration fine-tuning (usually ±5%). --- ## 3. Wiring Configuration To ensure proper electronic operation, the pins on the 11-pin base are typically assigned as follows: ```text PIN | FUNCTION -----|------------------ 1 | Output (+) 2 | Output (-) 3 | Input (RTD A) 4 | Input (RTD B) 5 | Input (RTD B') 7 | Power (L+) 24V DC 8 | Power (N-) 0V ``` --- ## 4. Operational Indicators The unit typically features a **Front LED** that indicates the status of the internal power supply. If the electronics are functioning and the 24V DC input is stable, the LED remains illuminated. ---