The **M2RTS-R-43-R/N** is a specific model within the M2RTS series of **Resistance Temperature Detectors (RTD)**, typically manufactured by companies like M-System (now MG CO., LTD). These devices are high-precision temperature sensors designed for industrial automation and signal conditioning. --- ### 1. Model Breakdown (Part Number Analysis) The alphanumeric code identifies the specific electrical and mechanical characteristics of the unit: | Segment | Meaning | Description | | :--- | :--- | :--- | | **M2RTS** | Series Name | Ultra-slim RTD Transmitter (M2 series) | | **R** | Power Input | Standard DC Power (typically 24V DC) | | **43** | Input/Output | 4: Pt 100 RTD Input / 3: 0–1V DC Output | | **R** | Mounting/Base | Standard plug-in base (Rail-mounted) | | **N** | Standards | Non-CE marking / General Industrial spec | --- ### 2. Core Electronic Components This device is an **Analog Transmitter**. Its primary electronic function is to convert the resistance change of a Pt100 sensor into a linear voltage signal. * **Input Circuit (Bridge Circuit):** Uses a constant current source to measure the resistance of the Pt100 sensor. It typically utilizes a 3-wire system to compensate for lead-wire resistance. * **Linearizer Circuit:** Since RTD resistance is not perfectly linear relative to temperature, internal circuitry linearizes the signal to ensure the output voltage is proportional to the temperature. * **Isolation Transformer:** Provides galvanic isolation between the input, output, and power supply. This prevents ground loops and protects sensitive PLC/DCS inputs from electrical noise. * **Zero/Span Adjustments:** Potentiometers located on the front panel allow for manual calibration of the 0% and 100% signal points. --- ### 3. Key Specifications | Feature | Specification | | :--- | :--- | | **Input Type** | Pt 100 (ITS-90) | | **Input Resistance** | 1M $\Omega$ minimum | | **Output Signal** | 0 – 1V DC | | **Accuracy** | $\pm$0.1% of span | | **Isolation** | 2000V AC @ 1 minute (Input to output to power) | | **Construction** | Slim-line (approx. 23mm width) | --- ### 4. Wiring and Installation The device is usually mounted on a **DIN rail**. 1. **Terminals 1, 2, 3:** Connection for the Pt100 RTD (3-wire). 2. **Terminals 4, 5:** Output signal (0-1V DC). 3. **Terminals 6, 7:** Power Supply (24V DC). ---